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Journal articles on the topic 'Relative magnetic permeability'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Zhou, Sui Hua, Zhi Yi Chen, and Shi Min Feng. "Improvement Methods of Apparent Permeability of Ferromagnetic Core." Advanced Materials Research 712-715 (June 2013): 1876–80. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1876.

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The performance of induction coil magnetic sensors , which usually have large dimensions and heavy weights, is mainly decided by apparent permeability of the core. But flux concentrator is a effective equipment to improve apparent permeability of the core, which will hardly increase dimensions and weights of magnetic sensors. Firstly, mathematical equations of apparent permeability are explained and influencing factors are analysed. Then influencing degrees of different parameters of the flux concentrator are simulated by Maxwell 2D/3D. The results are shown as follows. (a) The larger diameter

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2

Bastola, Anil K., Milan Paudel, and Lin Li. "Magnetic circuit analysis to obtain the magnetic permeability of magnetorheological elastomers." Journal of Intelligent Material Systems and Structures 29, no. 14 (2018): 2946–53. http://dx.doi.org/10.1177/1045389x18781046.

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The magnetic permeability of magnetorheological elastomers must be known for their long-term use in the actual engineering systems. In this article, the magnetic permeability of both isotropic and anisotropic magnetorheological elastomers has been determined using a new method. The magnetic induction was measured and a closed magnetic circuit analysis was carried out to obtain the magnetic permeability of magnetorheological elastomers for both isotropic and anisotropic magnetorheological elastomers with 10%–50% volume concentration of carbonyl iron particles. The magnetic permeability was incr

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3

Chandra, Bahadur Khadka. "Relative Nature of Electric Permittivity and Magnetic Permeability of Electromagnetic Wave." Indian Journal of Advanced Physics (IJAP) 2, no. 1 (2022): 17–25. https://doi.org/10.54105/ijap.C1021.041322.

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<strong>Abstract: </strong>This research is about the special theory of relativity on electric permittivity and magnetic permeability of electromagnetic wave. For this, Four Maxwell's electromagnetic equations play an important role. James Clerk Maxwell suggested that the light travel as electromagnetic wave which require no material medium for propagation. The speed of light (C) in free space is always constant and is independent of the speed of source or observer or the relative motion of the inertial system and has velocity 'C' given by. So velocity of electromagnetic waves depe

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4

Ding, Chao, Yunhui Mei, Khai D. T. Ngo, and Guoquan Lu. "A (Permalloy + NiZn Ferrite) Moldable Magnetic Composite for Heterogeneous Integration of Power Electronics." Materials 12, no. 12 (2019): 1999. http://dx.doi.org/10.3390/ma12121999.

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Soft magnetic moldable composites (SM2Cs) would be ideally suited for the integration of magnetic components in power electronic converters because they can be formed into magnetic cores by low-temperature and pressure-less processing. However, most SM2Cs have low relative magnetic permeability, typically less than 30, and high core-loss densities at switching frequencies over 1 MHz. To improve their magnetic properties, we combine powders of Permalloy and a NiZn ferrite with an acrylic polymer to formulate a paste of SM2C. The paste can be molded and then cured below 200 °C without pressure t

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5

Katoh, Tetsuo, Hiroki Takase, and Yasushi Ohshima. "Relative Permeability of Iron-Chromium Magnetic Alloys in Alternating Magnetic Field." DENKI-SEIKO[ELECTRIC FURNACE STEEL] 64, no. 4 (1993): 252–59. http://dx.doi.org/10.4262/denkiseiko.64.252.

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6

Sandulyak, Alexander V., Roman Y. Tkachenko, Darya A. Sandulyak, Maria N. Polismakova, Anna A. Sandulyak, and Vera A. Ershova. "Analysis of dependence between magnetic properties of granulated ferromagnetic specimens and relation of its length to diameter." Izmeritel`naya Tekhnika, no. 6 (2020): 46–51. http://dx.doi.org/10.32446/0368-1025it.2020-6-46-51.

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Paper studies the problems about experimental determining magnetic parameters of nonuniform granular magnetics. It has been noted that the existing shortage of direct and (or) indirect experimental data on the magnetic properties of granular ferromagnetic specimens with different values of a relative length, in particular, has a negative impact on the validity of the requirements and decisions to create and ensure the performance of relevant functional elements, movable operating elements of various equipments and devices. By the example of cylindrical specimens of balls with the range of rela

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7

Li, Xiao Yang, and Zan Dong Han. "Effect of Uniaxial Stress on Magnetic Permeability and Magnetic Loss of Low-Carbon Steel in Weak Alternating Magnetic Field." Applied Mechanics and Materials 678 (October 2014): 220–27. http://dx.doi.org/10.4028/www.scientific.net/amm.678.220.

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The inverse magnetostrictive effect provides a chance to detect the stress by measuring some magnetic parameters. So it is important to learn the effect of stress on some magnetic parameters. A measuring system to measure magnetic permeability and magnetic loss and a device to load uniaxial tension and pressure stress were developed. The result shows that magnetic permeability and magnetic loss increase with uniaxial tension stress increase and decreases with uniaxial pressure stress increase. It is also concluded that the relative change of magnetic permeability and magnetic loss decrease wit

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8

Володько, А. В., С. М. Фёдоров, Е. А. Ищенко, М. А. Сиваш, Л. В. Сопина, and А. В. Бунина. "MINIMIZING THE EFFECTIVE AREA OF SCATTERING BY MEANS OF CHANGING THE RELATIVE MAGNETIC PERMEABILITY." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 1 (April 19, 2021): 85–88. http://dx.doi.org/10.36622/vstu.2021.17.1.013.

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Исследуется зависимость эффективной площади рассеяния (ЭПР) от относительной магнитной проницаемости материала, из которого изготавливается структура. В качестве тела моделирования был выбран шар, который изготовлен из диэлектрического материала, у которого возможно выполнять изменение относительной магнитной проницаемости. По полученным результатам моделирования построены графики зависимости максимального значения моностатической ЭПР от частоты, а также от относительной магнитной проницаемости среды. Было показано, что с увеличением относительной магнитной проницаемости материала изготовления

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9

Khadka, Chandra Bahadur. "Relative Nature of Electric Permittivity and Magnetic Permeability of Electromagnetic Wave." Indian Journal of Advanced Physics 1, no. 3 (2022): 17–25. http://dx.doi.org/10.54105/ijap.c1021.041322.

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This research is about the special theory of relativity on electric permittivity and magnetic permeability of electromagnetic wave. For this, Four Maxwell's electromagnetic equations play an important role. James Clerk Maxwell suggested that the light travel as electromagnetic wave which require no material medium for propagation. The speed of light (C) in free space is always constant and is independent of the speed of source or observer or the relative motion of the inertial system and has velocity 'C' given by . So velocity of electromagnetic waves depend on obsolute magnetic permeability a

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10

Katiyar, Anurag Kumar, Alok Prakash, Antim Dangi, and Satya Kesh Dubey. "Development and validation of a low magnetic permeability measurement setup." Review of Scientific Instruments 93, no. 11 (2022): 114701. http://dx.doi.org/10.1063/5.0124348.

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Measurement of relative permeability has a significant role in deciding the suitability of magnetic material for various industrial applications. Several developments and modifications have been made that can directly or indirectly measure the permeability of such materials. However, these developments suffer from various limitations, such as low accuracy, poor resolution, and high cost of measurement. In this work, a new measurement setup has been developed to precisely measure relative permeability in the range of 1–2. The setup has been designed based on the flux metric (solenoid) method in

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11

Yang, Fenglai, Huaxun Liu, Shusheng Gao, et al. "Nuclear Magnetic Resonance and High-Speed Centrifugation for Gas-Water Relative Permeability Curve of Low-Permeability and Tight Sandstone." E3S Web of Conferences 598 (2024): 01006. http://dx.doi.org/10.1051/e3sconf/202459801006.

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Gas-water relative permeability curve is the foundation of gas reservoir dynamic analysis and numerical simulation. It is generally obtained through gas displacing water experiment. Referring to the existing national standards, gas-water relative permeability test is carried out for low-permeability and tight sandstone. The flow is discontinuous and the curve smoothness is poor, which affects the application of gaswater relative permeability curve. Based on the comparative analysis of a large number of mercury injection and NMR experimental results of low-permeability and tight sandstone, a me

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12

Bi, Yu, Xiao Ming Zhang, and Wan Jun Wang. "Design Study of Trapezoid-Shaped Magnetic Flux Concentrator for Axial Amplification Characteristics." Applied Mechanics and Materials 875 (January 2018): 77–83. http://dx.doi.org/10.4028/www.scientific.net/amm.875.77.

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In this paper, the axial magnetic field amplification characteristics of the trapezoid-shaped magnetic flux concentrator at micrometer scale are studied. The factors of the dimension parameters including the ratio of the outer and inner width, the aspect ratio, the air gap, as well as the material property including the relative permeability influencing on the magnetic gain are analyzed using the finite element method. It indicates that the concentrator with air gap shows obvious magnetic amplification. The concentrator shows intensive magnetic gain with the increasing ratio of the outer and i

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13

Xue, Kaihua, Lei Yang, Jiafei Zhao, Yanghui Li, Yongchen Song, and Shan Yao. "The Study of Flow Characteristics During the Decomposition Process in Hydrate-Bearing Porous Media Using Magnetic Resonance Imaging." Energies 12, no. 9 (2019): 1736. http://dx.doi.org/10.3390/en12091736.

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The flow characteristics during decomposition of hydrate-bearing sediments are the most critical parameters for the gas recovery potential from natural gas hydrate reservoirs. The absolute and relative permeability and the flow field distribution during the decomposition process of hydrate-bearing porous media synthetically created by glass beads are in-situ measured by using magnetic resonance imaging. The absolute permeability value increased slowly, then became stable after the decomposition amount was 50%. The relative permeability change curve is a typical X-shaped cross curve. As the hyd

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14

Zamiri, Mohammad Sadegh, Armin Afrough, Florea Marica, Laura Romero-Zerón, Benjamin Nicot, and Bruce J. Balcom. "Unsteady-State Relative Permeability Curves Derived From Saturation Data and Partial Derivatives Using Magnetic Resonance Imaging." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 65, no. 5 (2024): 699–710. http://dx.doi.org/10.30632/pjv65n5-2024a3.

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Laboratory coreflooding experiments are performed to determine relative permeability curves which characterize flow behavior in petroleum reservoirs. Commonly, numerical simulations are used to solve the inverse problem and fit the coreflooding results, assuming functional shapes for relative permeability curves. In this work, the acquisition of rapid saturation profiles was used to derive relative permeability curves, without the need for pressure and volume reading, and assuming any functional forms for relative permeability curves. The magnetic resonance (MR) imaging method—spin echo single

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15

Sandulyak, Alexander, Anna Sandulyak, and Petr Shkatov. "Dependence of Granular Matrix Demagnetizing Factor on the Matrix Relative Size." Advanced Materials Research 1083 (January 2015): 32–36. http://dx.doi.org/10.4028/www.scientific.net/amr.1083.32.

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We note that for a wide range of porous, especially granular, ferromagnetics used as matrices of magnetic filter-separators, there is still an issue of defining their demagnetizing factor N which has a dramatic effect on the values of average magnetic permeability of these operating units of filter-separators. The work aims at filling the existent gaps in the issue, we supply N values depending on the relative size of such magnets as well as a respective generalizing phenomenological dependence which is characterized by an exponential realtion between the demagnetizing factor and relative size

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16

Li, Qiang, Zuo Bin Yuan, Yong Ming Yang, and Cheng Hu. "The Simulated Calculation of the First Order Buoyancy Force under Different Relative Permeability of Ferrofluid." Applied Mechanics and Materials 303-306 (February 2013): 22–25. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.22.

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In this paper, the first order buoyancy force of ferrofluid is simulated calculation under external magnetic field in ferrofluid devices. The relationship between first order buoyancy force and displacement of nonmagnetic body under different relative permeability of ferrofluid，and the relationship between first order buoyancy force and relative permeability of ferrofluid are obtained.

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17

Kopala, Dominika, Anna Ostaszewska-Liżewska, and Roman Szewczyk. "Sensitivity Limits and Functional Characteristics of Fluxgate Sensors with Rod-Shaped Magnetic Cores." Pomiary Automatyka Robotyka 26, no. 2 (2022): 29–33. http://dx.doi.org/10.14313/par_244/29.

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Highly sensitive fluxgate magnetic field sensors with rod-shaped cores are widely used for non-destructive testing as well as for industrial applications. However, in case of both Foerster and Vacquier (two-core sensors configurations), fluxgate sensors sensitivity is directly connected with the relative magnetic permeability of the sensor’s core. It should be highlighted that the magnetic permeability of rod-shaped magnetic cores is driven mainly by the demagnetization factor determined by its slenderness (aspect ratio). The paper presents the analyses of sensitivity limits of fluxgate sensor

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18

Knight, J. D., Z. Xia, E. McCaul, and H. Hacker. "Determination of Forces in a Magnetic Bearing Actuator: Numerical Computation With Comparison to Experiment." Journal of Tribology 114, no. 4 (1992): 796–801. http://dx.doi.org/10.1115/1.2920951.

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Calculations of the forces exerted on a journal by a magnetic bearing actuator are presented, along with comparisons to experimentally measured forces. The calculations are based on two-dimensional solutions for the flux distribution in the metal parts and free space, using finite but constant permeability in the metals. Above a relative permeability of 104 the effects of changes in permeability are negligible, but below 104 decreases in permeability cause significant decreases in the force. The calculated forces are shown to depend on the metal permeability more strongly when the journal is d

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19

Sun, Jinji, Yan Lu, Lu Zhang, Yun Le, and Xiuqi Zhao. "A Method to Measure Permeability of Permalloy in Extremely Weak Magnetic Field Based on Rayleigh Model." Materials 15, no. 20 (2022): 7353. http://dx.doi.org/10.3390/ma15207353.

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In order to solve the problem that the relative permeability of the permalloy is missing and difficult to measure accurately in an extremely weak magnetic field (EWMF, <1 nT), a method to measure the permeability in EWMF based on the Rayleigh model is proposed in this paper. In this method, the Rayleigh model for the magnetic material was first introduced. Then, the test system for measuring the permeability of permalloy for the standard ring specimen was set up. Based on the test data and the Rayleigh model, the functional expression applied to obtain the permeability in EWMF is achieved.

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20

Diguet, Gildas, Gaël Sebald, Masami Nakano, Mickaël Lallart, and Jean-Yves Cavaillé. "Magnetic behavior of magneto-rheological foam under uniaxial compression strain." Smart Materials and Structures 31, no. 2 (2021): 025018. http://dx.doi.org/10.1088/1361-665x/ac3fc8.

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Abstract This study reports the development of a magneto-rheological foam, which consists in a porous matrix filled by ferromagnetic particles. The porous matrix of such a composite being easily deformable, large magnetic properties changes are expected. The measurements of the magnetic properties of such a magneto-rheological foam submitted to a compressive strain are reported. Main aspect of the magnetic properties is the low field magnetic permeability as the function of the compression and filling factor. Then, larger field magnetization measurement allowed to investigate the saturation fi

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21

Yan, Jin, Rongchen Zheng, Peng Chen, Shuping Wang, and Yunqing Shi. "Calculation Model of Relative Permeability in Tight Sandstone Gas Reservoir with Stress Sensitivity." Geofluids 2021 (December 10, 2021): 1–12. http://dx.doi.org/10.1155/2021/6260663.

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During the development of tight gas reservoir, the irreducible water saturation, rock permeability, and relative permeability change with formation pressure, which has a significant impact on well production. Based on capillary bundle model and fractal theory, the irreducible water saturation model, permeability model, and relative permeability model are constructed considering the influence of water film and stress sensitivity at the same time. The accuracy of this model is verified by results of nuclear magnetic experiment and comparison with previous models. The effects of some factors on i

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22

Sun, Jinji, Jianyi Ren, Jin Li, and Yuejing Huang. "Measurement and Analysis of Magnetic Properties of Permalloy for Magnetic Shielding Devices under Different Temperature Environments." Materials 16, no. 8 (2023): 3253. http://dx.doi.org/10.3390/ma16083253.

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The relative permeability, coercivity, and remanence of permalloy are closely related to the performance of magnetic shielding devices. In this paper, the relationship between the magnetic properties of permalloy and the working temperature of magnetic shielding devices is measured. Firstly, the measurement method of permalloy properties based on the simulated impact method is analyzed. What is more, a magnetic property test system consisting of a soft magnetic material tester and a high–low temperature chamber for permalloy ring samples at different temperatures was established to measure DC

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23

Li, Shixu, Miao Yu, Jun Liu, et al. "Attenuation of magneto-induced yield stress by magnetic carrier liquid in magnetorheological fluids." Applied Physics Letters 121, no. 16 (2022): 162901. http://dx.doi.org/10.1063/5.0101090.

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Magnetorheological fluids (MRFs) are composed of magnetic particles and carrier liquid that yield stress responses to the external magnetic field, a phenomenon called the magnetorheological effect. In this work, the attenuation of magneto-induced yield stress in an MRF caused by magnetic carrier liquid was observed. Compared with that of MRFs with nonmagnetic carrier liquid, the average critical strain was correspondingly increased by 53.17%, and the maximum dynamic and static yield stress were reduced by 12.98% and 13.58%, respectively. The attenuation was attributed to the magnetic carrier l

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24

Maricic, A., M. Spasojevic, S. Arnaut, D. Minic, and M. M. Ristic. "The effect of structural changes on magnetic permeability of amorphous powder Ni80Co20." Science of Sintering 40, no. 3 (2008): 303–9. http://dx.doi.org/10.2298/sos0803303m.

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The structural changes of Ni80Co20 amorphous powder were tested during heating. The alloy was obtained by electrolysis from ammonia solution sulfate of cobalt and nickel on the titanium cathode. The differential scanning calorimetry (DSC) method was used to detect that the crystallization process of powder occurred in two stages with crystallization peaks temperatures of the first stage at 690 K and of the second stage at 790 K. The effect of structural relaxation and crystallization of powder on magnetic properties was predicted by measurement of the relative magnetic permeability change in i

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25

Nurfarahin, Ishak, King Lee Chua, and Zarina Mohd Muji Siti. "A Simulation Magnetic Induction Tomography (MIT) for Agarwood using COMSOL Multiphysics." International Journal of Engineering and Advanced Technology (IJEAT) 10, no. 3 (2021): 67–71. https://doi.org/10.35940/ijeat.C2174.0210321.

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Magnetic induction tomography is an imaging technique used to image electromagnetic properties of an object by using the eddy current effect. (MIT) is a non-destructive method that greatly is used in the agriculture industry. This method provided an opportunity to improve the quality of agricultural products. MIT simulation was used for agarwood existence detection. This paper presented for the simulation system contains 7 channel coils receiver and a channel transmitter which is a sensing detector. This experiment aims to demonstrate the reaction of induced current density and magnetic field

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26

Long, Haiming, Xiaojie Wu, Yunkun Lu, Haifeng Zhang, and Junjie Hao. "Effect of Polyimide-Phosphating Double Coating and Annealing on the Magnetic Properties of Fe-Si-Cr SMCs." Materials 15, no. 9 (2022): 3350. http://dx.doi.org/10.3390/ma15093350.

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Fe-Si-Cr soft magnetic powder cores (SMCs), with high electrical resistivity, magnetic permeability, saturation magnetic induction, and good corrosion resistance, are widely applied to inductors, filters, choke coils, etc. However, with the development of electronic technology with high frequency and high power density, the relative decline in the magnetic properties limits the high-frequency application of SMCs. In this paper, the phosphating process and polyimide (PI) insulation coating is applied to Fe-Si-Cr SMCs to reduce the core loss, including hysteresis loss and eddy current loss. The

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27

Saleem, Muhammad, and Ali Rizwan. "Development of Application Specific Intelligent Framework for the Optimized Selection of Industrial Grade Magnetic Material." Polymers 13, no. 24 (2021): 4328. http://dx.doi.org/10.3390/polym13244328.

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This article attempts to introduce a simple and robust way for the classification of soft magnetic material by using multivariate statistics. The six magnetic properties including coercive magnetic field, relative magnetic permeability, electrical resistivity magnetic inductions, i.e., remanence and saturation along with Curie temperature are used for the classification of 16 soft magnetic materials. Descriptive statistics have been used for defining the prioritization order of the mentioned magnetic characteristics with coercive magnetic field and Curie temperature as the most and least impor

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Sandulyak, Anna, Alexander Sandulyak, Dmitry V. Oreshkin, and Marina Popova. "Applied Model of Magnetization of a Granulated Material." Applied Mechanics and Materials 467 (December 2013): 76–80. http://dx.doi.org/10.4028/www.scientific.net/amm.467.76.

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Results of researches (of magnetic permeability) of elementary effective magnetic channel in porous (granulated) material are given. Such results permit to calculate a relative intensity of field between the grains.

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29

Tsepelev, Vladimir. "Nanocrystalline Soft Magnetic Toroidal Cores of the Highest Relative Magnetic Permeability and Low Coercive Force." Advanced Materials Research 716 (July 2013): 276–80. http://dx.doi.org/10.4028/www.scientific.net/amr.716.276.

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All the technologies of the melt quenching preparation ensure its time-temperature treatment to not only improve but also stabilize the metal structure and properties with every melt. The influence of annealing temperature of nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9 on the structure and magnetic properties has been investigated. The relation between numerical values of the coercive force, the initial magnetic permeability and the magnetic hysteresis loop rectangularity factor allows optimizing a mode of nanocrystalline alloy heat treatment.

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Ahmad, Abid, Bhagyashree Mishra, Andrew Foley, Leslie Wood, and Maggie Yihong Chen. "High Permeability Photosintered Strontium Ferrite Flexible Thin Films." Micromachines 12, no. 1 (2021): 42. http://dx.doi.org/10.3390/mi12010042.

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The paper is focused on the development and optimization of strontium ferrite nanomaterial and photosintered flexible thin films. These magnetic thin films are characterized with direct current (DC) and high frequency measurements. For photosintered strontium ferrite samples, we achieved relative complex permeability of about 29.5-j1.8 and relative complex permittivity of about 12.9-j0.3 at a frequency of 5.9 GHz.

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Bormio-Nunes, Cristina, and Fernando Froes. "Magnetostriction reduction and magnetic permeability enhancement of Ti added Fe_0.7Co_0.3 alloy." Journal of Applied Physics 133, no. 12 (2023): 125109. http://dx.doi.org/10.1063/5.0140457.

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The current work presents the study of three alloys, (1) the binary Fe0.7Co0.3 alloy (atomic fraction), (2) the addition of 3 at. % of Ti, and (3) the addition of 3 at. % of Ti and 1% of Nb. The interest is to increase the permeability of this binary alloy due to the additions of Ti and Nb, since Fe–Co alloys with Co content in the range of 27–35 at. % have much lower permeability than the commercial equiatomic alloy. The advantage of low Co Fe–Co alloys is the lower price compared to the equiatomic one. The alloys were produced by arc melting and were subsequently hot rolled and annealed in t

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Neamţu, Bogdan Viorel, Florin Popa, Ecaterina Ware, et al. "Hydrothermal Deposition of ZnO Layer on Fe-Based Amorphous Fibres Used for the Preparation of Cold Sintered Fibre-Based Soft Magnetic Composites." Coatings 12, no. 10 (2022): 1527. http://dx.doi.org/10.3390/coatings12101527.

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This paper presents findings on the influence of hydrothermal deposition processing parameters (precursor concentration and deposition duration) on the characteristics of ZnO layers deposited on the surface of amorphous Fe-based fibres. The characteristics of the coated fibres, especially the deposited layer, were investigated from structural, morphological, chemical, thermal and magnetic points of view. It was found that the use of a zinc acetate-based solution of 0.05 M concentration and a deposition duration of 24 h leads to a continuous, thin and adherent layer of ZnO on the surface of the

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Beard, Les P., and Jonathan E. Nyquist. "Simultaneous inversion of airborne electromagnetic data for resistivity and magnetic permeability." GEOPHYSICS 63, no. 5 (1998): 1556–64. http://dx.doi.org/10.1190/1.1444452.

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Where the magnetic permeability of rock or soil exceeds that of free space, the effect on airborne electromagnetic systems is to produce a frequency‐independent shift in the in‐phase response of the system while altering the quadrature response only slightly. The magnitude of the in‐phase shift increases as (1) the relative magnetic permeability is increased, (2) the amount of magnetic material is increased, and (3) the airborne sensor gets nearer the earth’s surface. Over resistive, magnetic ground, the shift may be evinced by negative in‐phase measurements at low frequencies; but over more c

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Du, Jin-Hong, Chao Sun, Shuo Bai, Ge Su, Zhe Ying, and Hui-Ming Cheng. "Microwave Electromagnetic Characteristics of a Microcoiled Carbon Fibers/paraffin Wax Composite in Ku Band." Journal of Materials Research 17, no. 5 (2002): 1232–36. http://dx.doi.org/10.1557/jmr.2002.0182.

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The complex relative permittivity ∈γ and permeability μγ of microcoiled carbon fibers (MCCFs) imbedded in paraffin wax were measured at Ku band frequencies (12.4–18 GHz). Both the real and imaginary parts of the complex relative permittivity of the MCCFs/paraffin wax composite decreased with increase of the frequency. The real part of the complex relative permeability of the composite increases with increase of the frequency, and the imaginary part is nonzero and nearly constant over the measured frequency range. The dielectric loss tangent (tan δ∈), the magnetic loss tangent (tan δm), and amp

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Neto, K. Skeff, A. F. Bakuzis, P. C. Morais, et al. "The influence of aggregates and relative permeability on the magnetic birefringence in ionic magnetic fluids." Journal of Applied Physics 89, no. 6 (2001): 3362–69. http://dx.doi.org/10.1063/1.1345867.

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Zárybnická, Lucie, Marek Pagáč, Radek Ševčík, Jaroslav Pokorný, and Martin Marek. "Effect of Topology Parameters on Physical–Mechanical Properties of Magnetic PLA 3D-Printed Structures." Magnetochemistry 9, no. 12 (2023): 232. http://dx.doi.org/10.3390/magnetochemistry9120232.

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This work aims to characterize 3D-printed structures composed of a thermoplastic material (polylactic acid (PLA)) containing a combination of magnetic particles composed of iron(III) oxide (hematite) and iron(II)–iron (III) oxide (magnetite) with various infill densities and print orientations in regard to their possible processing by Fused Filament Fabrication additive technology. The correct processing temperatures have been determined using thermal analysis, and the paramagnetic and mechanical properties of the samples have been tested. The relative permeability has been identified to be st

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Rovers, J. M. M., J. W. Jansen, and E. A. Lomonova. "Modeling of Relative Permeability of Permanent Magnet Material Using Magnetic Surface Charges." IEEE Transactions on Magnetics 49, no. 6 (2013): 2913–19. http://dx.doi.org/10.1109/tmag.2012.2236103.

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Ayachit, Agasthya, and Marian K. Kazimierczuk. "Sensitivity of effective relative permeability for gapped magnetic cores with fringing effect." IET Circuits, Devices & Systems 11, no. 3 (2017): 209–15. http://dx.doi.org/10.1049/iet-cds.2016.0410.

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Guo, Yuhang, Baozhi Pan, and Lihua Zhang. "A New Method to Identify Reservoirs in Tight Sandstones Based on the New Model of Transverse Relaxation Time and Relative Permeability." Geofluids 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6787038.

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Relative permeability and transverse relaxation time are both important physical parameters of rock physics. In this paper, a new transformation model between the transverse relaxation time and the wetting phase’s relative permeability is established. The data shows that the cores in the northwest of China have continuous fractal dimension characteristics, and great differences existed in the different pore size scales. Therefore, a piece-wise method is used to calculate the fractal dimension in our transformation model. The transformation results are found to be quite consistent with the rela

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Thompson, Frank. "Measuring the permeability of magnetic materials in the GHz region." Physics Education 58, no. 6 (2023): 065025. http://dx.doi.org/10.1088/1361-6552/acfb6a.

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Abstract Magnetic materials have always been important in the commercial world and, as our transport systems are switching to electrification from fossil fuels, they are likely to become more so. Relative permeability, μ r, is one parameter which characterizes such materials and this article discusses some measurements of μ r, made on powdered iron oxide and two ferrite magnetic materials. Preliminary measured values of μ r range from 1.5 to 4 and the imaginary part of μ r, show that magnetic losses occur in the GHz region. An idea for improved measurements is suggested.

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Park, Hyun Ho, Heehyuk Lee, and Deuk-Kyu Hwang. "Regression Analysis for Predicting the Magnetic Field Shielding Effectiveness of Ferrite Sheets." Electronics 14, no. 2 (2025): 310. https://doi.org/10.3390/electronics14020310.

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In this paper, a method to predict near-field magnetic shielding effectiveness (NSE) of ferrite sheets is proposed by measuring their relative permeability. The NSE prediction for ferrite sheets is developed using eight regression models based on higher-order terms of permeability, extracted through Minitab’s regression analysis using data from the measured NSE and relative permeabilities of the ferrite sheets. To analyze the accuracy of the predicted NSE in comparison to the measured NSE, the mean square error (MSE) was computed. As a result, the extracted regression models enable fast and ac

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Birčáková, Zuzana, Peter Kollár, Bernd Weidenfeller, Ján Füzer, Radovan Bureš, and Mária Fáberová. "Iron Based Soft Magnetic Composite Material Prepared By Injection Molding." Powder Metallurgy Progress 21, no. 1 (2021): 10–17. http://dx.doi.org/10.2478/pmp-2021-0002.

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Abstract Soft magnetic composite materials consisting of FeSi powder and polypropylene were prepared by the injection molding method, with different polypropylene contents of 25, 30 and 35 vol. %. The magnetic and electrical properties as well as the structure of the composites were investigated. The samples exhibited very low porosity, high electrical resistivity, relatively low coercivity, sufficient saturation magnetic flux density and permeability, and high resonant frequency. FeSi particles were found to be well insulated from each other and homogeneously dispersed in the polymer matrix o

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Paltanea, Gheorghe, Veronica Manescu Paltanea, Iosif Vasile Nemoianu, and Horia Gavrila. "Non-Oriented Silicon Iron Alloys Used in Efficient Electrical Motor Production." Key Engineering Materials 821 (September 2019): 229–36. http://dx.doi.org/10.4028/www.scientific.net/kem.821.229.

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In this paper four non-oriented electrical steel grades M400-50A, M400-65A, M300-35A and NO20, utilizing a laboratory single sheet tester, were analyzed. For the magnetic measurements the peak magnetic polarization of 1 T was chosen. The frequency was variated between 3 Hz and 400 Hz. The isotropic electrical steel sheets were cut through punching technology, along the rolling direction. The experimentally determined energy losses were decomposed, using the loss separation theory, into hysteresis, classical and excess components. The relative magnetic permeability was analyzed and its parts, r

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Yap, Yun Kee, Pei Ching Oh та Evan Yew Jin Chin. "Development of αFe2O3-TiO2/PPOdm Mixed Matrix Membrane for CO2/CH4 Separation". E3S Web of Conferences 287 (2021): 02013. http://dx.doi.org/10.1051/e3sconf/202128702013.

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Magnetophoretic dispersion of magnetic fillers has been proven to improve gas separation performances of mixed matrix membrane (MMM). However, the magnetic field induced is usually in a horizontal or vertical direction during membrane casting. Limited study has been conducted on the effects of rotational magnetic field direction towards dispersion of particles. Thus, this work focuses on the rearrangement of paramagnetic iron oxide-titanium dioxide (αFe2O3-TiO2) nanocomposite in poly (2,6-dimethyl-1,4-phenylene oxide) (PPOdm) membrane via rotational magnetic field to investigate the dispersion

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Hu, Bo, Jingang Fu, Wenxin Yan, Kui Chen, and Jingchen Ding. "Normalization of Relative-Permeability Curves of Cores in High-Water-Content Tight Sandstone Gas Reservoir." Energies 18, no. 9 (2025): 2335. https://doi.org/10.3390/en18092335.

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The gas–water relative-permeability relationship in tight gas is complex due to interactions between the gas and water phases within the porous media in the reservoir. To clarify the fluid occurrence and the gas–water relative-permeability behavior in such reservoirs, the Dongsheng tight water-bearing reservoir from the Ordos Basin of China is taken as the research object. A non-steady state method is employed to explore the co-permeability of gas and water phases under dynamic conditions. The irreducible water saturation of different core samples is analyzed using nuclear magnetic resonance (

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Li, Hengtao, Yan Liu, Huan Yao, and Xianxian Wang. "Research on quantitative characterization method of tensile and compressive stress based on incremental magnetic permeability principle." Journal of Physics: Conference Series 2951, no. 1 (2025): 012087. https://doi.org/10.1088/1742-6596/2951/1/012087.

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Abstract In this study, non-destructive quantitative characterization of stresses in low, medium, and high carbon steels was carried out based on the principle of incremental permeability (IP) detection. First, a special fixture was designed and constructed to perform calibration experiments on a single flat plate tensile specimen to obtain the incremental magnetic permeability signals at different compressive and tensile stress levels. Subsequently, the relationship between the magnetic parameter and the stress characterization was analyzed. Finally, a network model was established to realize

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Pesic, O., M. Spasojevic, B. Jordovic, P. Spasojevic, and A. Maricic. "Effect of electrodeposition current density on the microstructure and magnetic properties of nickel-cobalt-molybdenum alloy powders." Science of Sintering 46, no. 1 (2014): 117–27. http://dx.doi.org/10.2298/sos1401117p.

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Nanostructured nickel-cobalt-molybdenum alloy powders were electrodeposited from an ammonium sulfate bath. The powders mostly consist of an amorphous phase and a very small amount of nanocrystals with an mean size of less than 3 nm. An increase in deposition current density increases the amorphous phase percentage, the density of chaotically distributed dislocations and internal microstrains in the powders, while decreasing the mean nanocrystal size. The temperature range over which the structural relaxation of the powders deposited at higher current densities occurs is shifted towards lower t

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Valentyn, Glyva, Bakharev Volodymyr, Kasatkina Natalia, et al. "Design of liquid composite materials for shielding electromagnetic fields." Eastern-European Journal of Enterprise Technologies 3, no. 6 (111) (2021): 25–31. https://doi.org/10.15587/1729-4061.2021.231479.

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This paper reports the principles of design and the examined protective properties of liquid materials for shielding the electric, magnetic, and electromagnetic fields over a wide frequency range. The materials were made on the basis of iron ore concentrate and a pigment additive, with water-dispersed and geopolymer paints used as a matrix. The tests of protective properties for the electrical and magnetic components of the electromagnetic field of industrial frequency showed that the electric field shielding coefficients at a concentration of the screening substance of 15−60 % (by

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Lee, Jae-Gon. "Directional Monopole Antenna Using a Planar Lossy Magnetic (PLM) Surface." Journal of Electromagnetic Engineering and Science 23, no. 4 (2023): 351–54. http://dx.doi.org/10.26866/jees.2023.4.r.177.

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A directional monopole antenna using a planar lossy magnetic (PLM) surface is proposed in this paper. When a monopole antenna is designed vertically on the ground plane composed of a perfect electric conductor (PEC) and a perfect magnetic conductor (PMC), the surface current on the ground plane cannot flow on the PMC and only flows in one direction on the PEC. Therefore, the electromagnetic (EM) wave of such a monopole antenna can radiate in the direction perpendicular to the ground. Alternatively, a PLM surface such as a ferrite sheet with a high relative permeability was employed to achieve

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Zárybnická, Lucie, Martin Marek, Radek Ševčík, Radek Stolín, Jaroslav Pokorný, and Jiří Šál. "Effect of Infill Density of the Printed PET-G Structures Containing Iron Oxides on Magnetic Properties." Magnetochemistry 9, no. 1 (2022): 2. http://dx.doi.org/10.3390/magnetochemistry9010002.

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This work aims to characterize printing structures with various infill densities composed of a thermoplastic material containing magnetic particles composed of mainly Iron(III) oxides with regard to their possible processing with the additive technology of Fused Filament Fabrication. A polyethylene terephthalate glycol (PET-G) structural thermoplastic with the addition of Iron(III)) oxides has been selected, and correct processing temperatures have been determined using thermal analysis. The paramagnetic properties of printed products consisting of different filling densities have been tested.

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