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Journal articles on the topic 'Magnetization dynamics of the nanoparticle'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Shytyi. A.M., Vasilevskaya T. M., and Sementsov D. I. "Resonant dynamics of the magnetization of uniaxial nanoparticle." Physics of the Solid State 64, no. 6 (2022): 635. http://dx.doi.org/10.21883/pss.2022.06.53825.279.

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Analysis of equilibrium conditions was carried out and resonant precessional dynamics of magnetization of a single-domain magnetically uniaxial ellipsoidal particle. Considered the case when magnetic field is along the easy magnetization axis. the easy magnetization axis is directed parallel to the axis of symmetry of the ellipsoid and transverse to pumping by a weak high-frequency field. Features of the behavior of the magnetization were discovered. It has been revealed that the magnetization has features of resonant behavior: large resonant precession angles with amplitude 0.5M0, elliptical

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2

Syed, Maarij, and John Moore. "Magnetic Response of Iron Oxide Nanoparticles as Measured by AC Faraday Rotation." MRS Proceedings 1552 (2013): 59–64. http://dx.doi.org/10.1557/opl.2013.921.

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ABSTRACTMetal ferrite nanoparticles are of considerable technological and theoretical interest. Magnetic response of these systems is a function of various system properties like saturation magnetization, growth orientation, average particle size and size distribution, volume concentration, etc. [1]. This preliminary study investigates the magnetization dynamics (and thereby the Verdet constant) of aqueous Fe3O4 nanoparticle solutions through precision AC measurements of the Faraday Rotation (FR) at 633 nm for three different Fe3O4 nanoparticle solutions that are all prepared to have the same

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3

Du, Zhongzhou, Dandan Wang, Yi Sun, Yuki Noguchi, Shi Bai, and Takashi Yoshida. "Empirical Expression for AC Magnetization Harmonics of Magnetic Nanoparticles under High-Frequency Excitation Field for Thermometry." Nanomaterials 10, no. 12 (2020): 2506. http://dx.doi.org/10.3390/nano10122506.

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The Fokker–Planck equation accurately describes AC magnetization dynamics of magnetic nanoparticles (MNPs). However, the model for describing AC magnetization dynamics of MNPs based on Fokker-Planck equation is very complicated and the numerical calculation of Fokker-Planck function is time consuming. In the stable stage of AC magnetization response, there are differences in the harmonic phase and amplitude between the stable magnetization response of MNPs described by Langevin and Fokker–Planck equation. Therefore, we proposed an empirical model for AC magnetization harmonics to compensate th

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4

Berkov, D. V., N. L. Gorn, and P. G�rnert. "Magnetization Dynamics in Nanoparticle Systems: Numerical Simulation Using Langevin Dynamics." physica status solidi (a) 189, no. 2 (2002): 409–21. http://dx.doi.org/10.1002/1521-396x(200202)189:2<409::aid-pssa409>3.0.co;2-g.

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5

Titov, S. V., Yu P. Kalmykov, K. D. Kazarinov, M. A. Cherkasskii, and A. S. Titov. "Inertial Magnetization Dynamics in Ferromagnetic Nanoparticles Near Saturation." Радиотехника и электроника 68, no. 5 (2023): 454–60. http://dx.doi.org/10.31857/s0033849423050169.

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Analytical solutions of the inertial Landau‒Lifshitz‒Gilbert equation for the longitudinal and transverse components of the magnetization of a single-domain ferromagnetic nanoparticle under near-saturation conditions are obtained. The solution method is based on simplifying the equation using the first integrals, which are determined using the analogy between the inertial motion of magnetization and the mechanical rotation of a solid. It is shown that accounting for the magnetization inertia causes the nutation at a frequency represented by means of a complete elliptic integral of the first ki

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6

Shutyi A. M., Vasilevskaya T. M., Sementsov D. I., and Eliseeva S.V. "Precession Dynamics of the Uniaxial Nanoparticle Magnetization in the Ferromagnetic Resonance Region." Physics of the Solid State 65, no. 6 (2023): 1002. http://dx.doi.org/10.21883/pss.2023.06.56115.56.

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The influence of the shape parameter (oblateness) of a uniaxial ellipsoidal nanoparticle on the dynamics of its magnetic moment upon magnetization along the symmetry axis and excitation by a weak transverse high-frequency field in the region of parameters where the equilibrium magnetic moment of the nanoparticle and the external static field is noncollinear has been studied. It is shown that as the oblateness increases, the irregularity of the oscillations increases, which at first affects only their amplitude, but then also the time dependence. The intervals of the shape parameter (or frequen

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7

Sadat, Md Ehsan, Sergey L. Bud’ko, Rodney C. Ewing, et al. "Effect of Dipole Interactions on Blocking Temperature and Relaxation Dynamics of Superparamagnetic Iron-Oxide (Fe3O4) Nanoparticle Systems." Materials 16, no. 2 (2023): 496. http://dx.doi.org/10.3390/ma16020496.

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The effects of dipole interactions on magnetic nanoparticle magnetization and relaxation dynamics were investigated using five nanoparticle (NP) systems with different surfactants, carrier liquids, size distributions, inter-particle spacing, and NP confinement. Dipole interactions were found to play a crucial role in modifying the blocking temperature behavior of the superparamagnetic nanoparticles, where stronger interactions were found to increase the blocking temperatures. Consequently, the blocking temperature of a densely packed nanoparticle system with stronger dipolar interactions was f

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8

Markovich, Gil. "Magneto-transport and magnetization dynamics in magnetic nanoparticle assemblies." MRS Bulletin 38, no. 11 (2013): 939–44. http://dx.doi.org/10.1557/mrs.2013.259.

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9

Shutyi A. M. and Sementsov D. I. "Dynamics of magnetization of a uniaxial nanoparticle in the region of noncollinear ferromagnetic resonance." Physics of the Solid State 64, no. 12 (2022): 1904. http://dx.doi.org/10.21883/pss.2022.12.54384.448.

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Resonance dynamics of the magnetic moment of a uniaxial ellipsoidal nanoparticle under its magnetic biasing along the symmetry axis and excitation by a transverse high-frequency field is studied with the parameters (frequency, magnetic bias field and shape parameter), corresponding to the noncollinear orientation of equilibrium magnetization and the external static field. We revealed the frequency regions where precession becomes nonlinear at a weak alternating field and dynamic bistability, as well as complex spatial attractors and chaos are implemented. Keywords: ellipsoidal nanoparticle, fe

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10

Tang, Ke. "Micromagnetic Simulation of Ferromagnetic Resonance in Nanoparticle with Lateral Gradient Magnetization." Advanced Materials Research 677 (March 2013): 113–18. http://dx.doi.org/10.4028/www.scientific.net/amr.677.113.

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Micromagnetic simulation is performed on a ferromagnetic nanoparticle with lateral gradient magnetization in order to study its resonance modes and magnetizaiton dynamics mechenism under microwave frequency. The ferromagnetic resonance spectra and magnetzation reversal are calculated with dc magnetic field from 0 to 600 mT. The simulations show that an obvious border spin wave resnonace mode arises under a greater magnetic external field, which provide a new method to excite spin wave in magnonics; the hard phase determines the process of dynamical magnetization reversal under microwave freque

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11

Шутый, А. М., Т. М. Василевская та Д. И. Семенцов. "Резонансная динамика намагниченности одноосной наночастицы". Физика твердого тела 64, № 6 (2022): 646. http://dx.doi.org/10.21883/ftt.2022.06.52389.279.

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Analysis of equilibrium conditions was carried out and resonant precessional dynamics of magnetization of a single-domain magnetically uniaxial ellipsoidal particle. Сonsidered the case when magnetic field is along the easy magnetization axis. the easy magnetization axis is directed parallel to the axis of symmetry of the ellipsoid and transverse to pumping by a weak high-frequency field. Features of the behavior of the magnetization were discovered. It has been revealed that the magnetization has features of resonant behavior: large resonant precession angles with amplitude , elliptical devia

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12

Kechrakos, D., and K. N. Trohidou. "Dipolar Interaction Effects in the Magnetic and Magnetotransport Properties of Ordered Nanoparticle Arrays." Journal of Nanoscience and Nanotechnology 8, no. 6 (2008): 2929–43. http://dx.doi.org/10.1166/jnn.2008.18320.

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Assemblies of magnetic nanoparticles exhibit interesting physical properties arising from the competition of intraparticle dynamics and interparticle interactions. In ordered arrays of magnetic nanoparticles magnetostatic interparticle interactions introduce collective dynamics acting competitively to random anisotropy. Basic understanding, characterization and control of dipolar interaction effects in arrays of magnetic nanoparticles is an issue of central importance. To this end, numerical simulation techniques offer an indispensable tool. We report on Monte Carlo studies of the magnetic hys

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13

Шутый, А. М., Т. М. Василевская, Д. И. Семенцов та С. В. Елисеева. "Прецессионная динамика намагниченности одноосной наночастицы в области ферромагнитного резонанса". Физика твердого тела 65, № 6 (2023): 1047. http://dx.doi.org/10.21883/ftt.2023.06.55664.56.

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The influence of the shape parameter (oblateness) of a uniaxial ellipsoidal nanoparticle on the dynamics of its magnetic moment upon magnetization along the symmetry axis and excitation by a weak transverse high-frequency field in the region of parameters where the equilibrium magnetic moment of the nanoparticle and the external static field is noncollinear has been studied. It is shown that as the oblateness increases, the irregularity of the oscillations increases, which at first affects only their amplitude, but then also the time dependence. The intervals of the shape parameter (or frequen

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14

Roa, Nathaly, and Johans Restrepo. "Micromagnetic Approach to the Metastability of a Magnetite Nanoparticle and Specific Loss Power as Function of the Easy-Axis Orientation." Physchem 3, no. 3 (2023): 290–303. http://dx.doi.org/10.3390/physchem3030020.

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Magnetic nanoparticles (MNPs) have attracted a great interest in nanomedical research. MNPs exhibit many important properties. In particular, magnetic hyperthermia for selective killing of cancer cells is one of them. In hyperthermia treatment, MNPs act as nano-heaters when they are under the influence of an alternating magnetic field (AMF). In this work, micromagnetic simulations have been used to investigate the magnetization dynamics of a single-domain nanoparticle of magnetite in an external AMF. Special attention is paid to the circumstances dealing with a dynamic phase transition (DPT).

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15

Bui, Thinh Q., Adam J. Biacchi, Cindi L. Dennis, Weston L. Tew, Angela R. Hight Walker, and Solomon I. Woods. "Advanced characterization of magnetization dynamics in iron oxide magnetic nanoparticle tracers." Applied Physics Letters 120, no. 1 (2022): 012407. http://dx.doi.org/10.1063/5.0077016.

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16

Rytov, Ruslan Alekseevich, and Nikolai Aleksandrovich Usov. "Specific absorption rate of randomly oriented magnetic nanoparticles in a static magnetic field." Beilstein Journal of Nanotechnology 14 (April 14, 2023): 485–93. http://dx.doi.org/10.3762/bjnano.14.39.

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Numerical simulations using the stochastic Landau–Lifshitz equation are performed to study magnetization dynamics of dilute assemblies of iron oxide nanoparticles exposed to an alternating (ac) magnetic field with an amplitude Hac = 200 Oe and a frequency f = 300 kHz and a static (dc) magnetic field in the range Hdc = 0–800 Oe. The specific absorption rate (SAR) of the assemblies is calculated depending on the angle between the directions of the ac and dc magnetic fields. For the case of an inhomogeneous dc magnetic field created by two opposite magnetic fluxes, the spatial distribution of the

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17

Aurélio, David, and Jana Vejpravova. "Understanding Magnetization Dynamics of a Magnetic Nanoparticle with a Disordered Shell Using Micromagnetic Simulations." Nanomaterials 10, no. 6 (2020): 1149. http://dx.doi.org/10.3390/nano10061149.

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Spin disorder effects influence magnetization dynamics and equilibrium magnetic properties of real nanoparticles (NPs). In this work, we use micromagnetic simulations to try to better understand these effects, in particular, on how the magnetization reversal is projected in the character of the hysteresis loops at different temperatures. In our simulation study, we consider a prototype NP adopting a magnetic core-shell model, with magnetically coherent core and somewhat disordered shell, as it is one of the common spin architectures in real NPs. The size of the core is fixed to 5.5 nm in diame

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18

Foulkes, T., M. Syed, and T. Taplin. "Pulsed field probe of real time magnetization dynamics in magnetic nanoparticle systems." Journal of Applied Physics 117, no. 17 (2015): 17E128. http://dx.doi.org/10.1063/1.4917326.

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19

Sukhov, A., and J. Berakdar. "Temperature-dependent magnetization dynamics of magnetic nanoparticles." Journal of Physics: Condensed Matter 20, no. 12 (2008): 125226. http://dx.doi.org/10.1088/0953-8984/20/12/125226.

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20

Mayergoyz, Isaak D., Claudio Serpico, and Giorgio Bertotti. "On Stability of Magnetization Dynamics in Nanoparticles." IEEE Transactions on Magnetics 46, no. 6 (2010): 1718–21. http://dx.doi.org/10.1109/tmag.2009.2039119.

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21

Moss, Gabrielle, Christian Knopke, and Solomon G. Diamond. "Effects of Salt Concentration on a Magnetic Nanoparticle-Based Aggregation Assay with a Tunable Dynamic Range." Sensors 24, no. 19 (2024): 6241. http://dx.doi.org/10.3390/s24196241.

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Magnetic nanoparticles (MNPs) can be functionalized with antibodies to give them an affinity for a biomarker of interest. Functionalized MNPs (fMNPs) cluster in the presence of a multivalent target, causing a change in their magnetization. Target concentration can be proportional to the 3rd harmonic phase of the fMNP magnetization signal. fMNP clustering can also be induced with salt. Generally, salt can alter the stability of charge stabilized fMNPs causing a change in magnetization that is not proportional to the target concentration. We have developed a model system consisting of biotinylat

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22

Babić-Stojić, Branka, Vukoman Jokanović, Dušan Milivojević, et al. "Magnetic and Structural Studies of CoFe2O4Nanoparticles Suspended in an Organic Liquid." Journal of Nanomaterials 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/741036.

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We present a study of magnetic and structural properties of CoFe2O4nanoparticles suspended in an organic liquid. Transmission electron microscopy shows that the nanoparticles have a narrow size distribution of average particle size 5.9 ± 1.0 nm. X-ray diffraction shows that the particles are of cubic spinel crystal structure. Dynamic light scattering measurements reveal the existence of an organic shell around the CoFe2O4nanoparticles with an average hydrodynamic diameter of 14.4 nm. Coercive magnetic field atT=5 K is found to be 11.8 kOe. Disappearance of the coercive field and remanent magne

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23

Tirosh, Einat, Nurit Taub, Sara A. Majetich, and Gil Markovich. "Scanning Tunneling Spectroscopy Study of Temperature-Dependent Magnetization Switching Dynamics in Magnetic Nanoparticle Arrays." Israel Journal of Chemistry 48, no. 2 (2008): 81–86. http://dx.doi.org/10.1560/ijc.48.2.81.

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24

Rana, Bivas, and Anjan Barman. "Ultrafast Magnetization Dynamics of Chemically Synthesized Ni Nanoparticles." Journal of Physical Chemistry C 119, no. 30 (2015): 17444–49. http://dx.doi.org/10.1021/acs.jpcc.5b04759.

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25

Titov, S. V., Yu P. Kalmykov, K. D. Kazarinov, M. A. Cherkasskii, and A. S. Titov. "Inertial Magnetization Dynamics in Ferromagnetic Nanoparticles Near Saturation." Journal of Communications Technology and Electronics 68, no. 5 (2023): 559–65. http://dx.doi.org/10.1134/s1064226923050169.

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26

Ilg, Patrick, and Martin Kröger. "Dynamics of interacting magnetic nanoparticles: effective behavior from competition between Brownian and Néel relaxation." Physical Chemistry Chemical Physics 22, no. 39 (2020): 22244–59. http://dx.doi.org/10.1039/d0cp04377j.

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We identify the influence of dipolar and steric interactions on the Brownian and Néel contributions to the magnetization dynamics of magnetic nanoparticles from extensive computer simulations using a combined Brownian dynamics/Monte-Carlo method.

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27

Umavathi, J. C. "Von Karman Swirling Flow of Hybrid Nanofluid from a Spinning Disc: Magnetization." Journal of Nanofluids 14, no. 1 (2025): 27–37. https://doi.org/10.1166/jon.2025.2194.

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Due to its magnetic controllability and versatility, hybrid ferrofluid is a special kind of heat transfer fluid. Its potential must be further explored by researching boundary layer flow and heat transfer, particularly in order to address the issue of thermal efficiency. Thus, the challenge of steadily swirling Von Karman thermo-magnetic water-based (Fe3O4–CoFe2O4)/H2O hybrid nanofluid (HNF) and Fe3O4/H2O monofluid (MNF) flowing from a spinning disc in Darcian permeable media is the main focus of this research. The dynamics have been described for this purpose as a system of PDEs, which are th

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28

Gandhi, Ashish Chhaganlal, Rajakar Selvam, Chia-Liang Cheng та Sheng Yun Wu. "Room Temperature Magnetic Memory Effect in Nanodiamond/γ-Fe2O3 Composites". Nanomaterials 11, № 3 (2021): 648. http://dx.doi.org/10.3390/nano11030648.

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We report a room temperature magnetic memory effect (RT-MME) from magnetic nanodiamond (MND) (ND)/γ-Fe2O3 nanocomposites. The detailed crystal structural analysis of the diluted MND was performed by synchrotron radiation X-ray diffraction, revealing the composite nature of MND having 99 and 1% weight fraction ND and γ-Fe2O3 phases, respectively. The magnetic measurements carried out using a DC SQUID magnetometer show the non-interacting superparamagnetic nature of γ-Fe2O3 nanoparticles in MND have a wide distribution in the blocking temperature. Using different temperature, field, and time rel

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29

Mørup, Steen, Cathrine Frandsen, and Mikkel Fougt Hansen. "Uniform excitations in magnetic nanoparticles." Beilstein Journal of Nanotechnology 1 (November 22, 2010): 48–54. http://dx.doi.org/10.3762/bjnano.1.6.

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We present a short review of the magnetic excitations in nanoparticles below the superparamagnetic blocking temperature. In this temperature regime, the magnetic dynamics in nanoparticles is dominated by uniform excitations, and this leads to a linear temperature dependence of the magnetization and the magnetic hyperfine field, in contrast to the Bloch T 3/2 law in bulk materials. The temperature dependence of the average magnetization is conveniently studied by Mössbauer spectroscopy. The energy of the uniform excitations of magnetic nanoparticles can be studied by inelastic neutron scatterin

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30

Kaisar, Tahmid, Md Mahadi Rajib, Hatem ElBidweihy, Mladen Barbic, and Jayasimha Atulasimha. "Modeling of magnetization dynamics and thermal magnetic moment fluctuations in nanoparticle-enhanced magnetic resonance detection." Journal of Applied Physics 129, no. 21 (2021): 214505. http://dx.doi.org/10.1063/5.0043905.

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31

Kuznetsov, A. A. "MAGNETODYNAMICS OF A DILUTE FERROCOLLOID IN A SHEAR FLOW." Bulletin of the South Ural State University series "Mathematics. Mechanics. Physics" 15, no. 2 (2023): 59–65. http://dx.doi.org/10.14529/mmph230208.

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The work is devoted to a theoretical study of a dilute suspension of magnetic nanoparticles under the combined action of a simple shear flow and a constant magnetic field. The main attention is paid to the dynamics of the magnetization vector of the system. It is shown that at any nonzero temperature the magnetization takes a stationary orientation in a finite time. The direction of magnetization generally does not coincide with the direction of the field. Equilibrium and non-equilibrium magnetization components are calculated as functions of two dimensionless parameters – Mason number (i.e.,

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32

Anderson, Nicholas R., Jonathon Davidson, Dana R. Louie, David Serantes, and Karen L. Livesey. "Simulating the Self-Assembly and Hysteresis Loops of Ferromagnetic Nanoparticles with Sticking of Ligands." Nanomaterials 11, no. 11 (2021): 2870. http://dx.doi.org/10.3390/nano11112870.

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The agglomeration of ferromagnetic nanoparticles in a fluid is studied using nanoparticle-level Langevin dynamics simulations. The simulations have interdigitation and bridging between ligand coatings included using a computationally-cheap, phenomenological sticking parameter c. The interactions between ligand coatings are shown in this preliminary study to be important in determining the shapes of agglomerates that form. A critical size for the sticking parameter is estimated analytically and via the simulations and indicates where particle agglomerates transition from well-ordered (c is smal

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33

Pablo, Nieves Cordones, Serantes D., and Chubykalo-Fesenko O. "Self-consistent description of spin-phonon dynamics in ferromagnets." Physical Review B 94, no. 1 (2016): 014111. https://doi.org/10.1103/PhysRevB.94.014409.

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  Several recently reported exciting phenomena such as spin caloritronics or ultrafast laser-induced spin dynamics involve the action of temperature on spin dynamics. However, the inverse effect of magnetization dynamics on temperature change is very frequently ignored. Based on the density matrix approach, in this work we derive a self-consistent model for describing the magnetization and phonon temperature dynamics in ferromagnets in the framework of the quantum Landau-Lifshitz-Bloch equation. We explore potential applicability of our approach for two cases, inspired by magnetocaloric e

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34

Ota, S., and Y. Takemura. "Dynamics of Magnetization and Easy Axis of Individual Ferromagnetic Nanoparticle Subject to Anisotropy and Thermal Fluctuations." Journal of the Magnetics Society of Japan 43, no. 2 (2019): 34–41. http://dx.doi.org/10.3379/msjmag.1903r005.

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35

Srinath, S., P. Poddar, Deepti S. Sidhaye, B. L. V. Prasad, J. Gass, and H. Srikanth. "Static and Dynamic Magnetic Properties of Co Nanoparticles." Journal of Nanoscience and Nanotechnology 8, no. 8 (2008): 4086–91. http://dx.doi.org/10.1166/jnn.2008.an06.

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Co nanoparticles have been synthesized using wet-chemical methods. As-synthesized particles show a sharp low temperature peak in zero-field cooled (ZFC) magnetization well below the blocking transition temperature and this feature is associated with surface spin disorder. We have investigated the dynamic magnetic properties of Co using ac susceptibility and resonant RF transverse susceptibility (TS). We also studied the memory and relaxation effects in these nanoparticle systems. From these measurements we show a typical blocking behavior of an assembly of superparamagnetic nanoparticles with

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36

Usov, Nikolai A., Ruslan A. Rytov, and Vasiliy A. Bautin. "Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields." Beilstein Journal of Nanotechnology 10 (November 22, 2019): 2294–303. http://dx.doi.org/10.3762/bjnano.10.221.

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The dynamics of magnetic nanoparticles in a viscous liquid in a rotating magnetic field has been studied by means of numerical simulations and analytical calculations. In the magneto-dynamics approximation three different modes of motion of the unit magnetization vector and particle director are distinguished depending on frequency and amplitude of the rotating magnetic field. The specific absorption rate of a dilute assembly of superparamagnetic nanoparticles in rotating magnetic field is calculated by solving the Landau–Lifshitz stochastic equation for the unit magnetization vector and the s

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37

Ghosh, Suvojit, and Ishwar K. Puri. "Changing the magnetic properties of microstructure by directing the self-assembly of superparamagnetic nanoparticles." Faraday Discussions 181 (2015): 423–35. http://dx.doi.org/10.1039/c4fd00245h.

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Magnetic nanoparticles (MNPs) in a liquid dispersion can be organized through controlled self-assembly by applying an external magnetic field that regulates inter-particle interactions. Thus, micro- and nanostructures of desired morphology and superlattice geometry that show emergent magnetic properties can be fabricated. We describe how superferromagnetism, which is a specific type of emergence, can be produced. Here, superparamagnetic nanoparticles that show no individual residual magnetization are organized into structures with substantial residual magnetization that behave as miniature per

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38

Rana, Bivas, Milan Agrawal, Semanti Pal, and Anjan Barman. "Magnetization reversal dynamics in clusters of single domain Ni nanoparticles." Journal of Applied Physics 107, no. 9 (2010): 09B513. http://dx.doi.org/10.1063/1.3359422.

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39

Sukhov, A., and J. Berakdar. "Influence of field orientation on the magnetization dynamics of nanoparticles." Applied Physics A 98, no. 4 (2010): 837–42. http://dx.doi.org/10.1007/s00339-010-5548-9.

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40

Knyazev, Yu V., D. A. Balaev, S. A. Skorobogatov, et al. "Superparamagnetic Relaxation in Ensembles of Ultrasmall Ferrihydrite Nanoparticles." Fizika metallov i metallovedenie 125, no. 4 (2024): 420–29. http://dx.doi.org/10.31857/s0015323024040068.

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The paper examines the impact of interparticle interactions on the superparamagnetic relaxation of ultrasmall nanoparticle ensembles, using Fe2O3∙nH2O iron oxyhydroxide (ferrihydrite) nanoparticles as an example. Two samples were analyzed: ferrihydrite of biogenic origin (with an average particle size of d ≈ 2.7 nm) with a natural organic shell, and a sample (with d ≈ 3.5 nm) that underwent low-temperature annealing, during which the organic shell was partially removed. The DC and AC magnetic susceptibilities (χ′(T), χ′′(T)) in a small magnetic field in the superparamagnetic (SPM) blocking reg

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41

Rivera-Rodriguez, Angelie, and Carlos M. Rinaldi-Ramos. "Emerging Biomedical Applications Based on the Response of Magnetic Nanoparticles to Time-Varying Magnetic Fields." Annual Review of Chemical and Biomolecular Engineering 12, no. 1 (2021): 163–85. http://dx.doi.org/10.1146/annurev-chembioeng-102720-015630.

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Magnetic nanoparticles are of interest for biomedical applications because of their biocompatibility, tunable surface chemistry, and actuation using applied magnetic fields. Magnetic nanoparticles respond to time-varying magnetic fields via physical particle rotation or internal dipole reorientation, which can result in signal generation or conversion of magnetic energy to heat. This dynamic magnetization response enables their use as tracers in magnetic particle imaging (MPI), an emerging biomedical imaging modality in which signal is quantitative of tracer mass and there is no tissue backgro

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42

Chuev, Mikhail, Valery Cherepanov, Maxim P. Nikitin, and Mikhail Polikarpov. "Biodegradation of Nanoparticles in a Body from Mössbauer and Magnetization Measurements." Solid State Phenomena 190 (June 2012): 725–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.725.

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In order to extract a quantitative information about characteristics of the magnetic nanoparticles injected into a living organism one has to define a model of the magnetic dynamics in order to fit self-consistently the whole set of the experimental data, particularly, the evolution of Mössbauer spectral shape with temperature and external magnetic field as well as the magnetization curves. We have developed such a model and performed such an analysis of the temperature-and magnetic field-dependent spectra and magnetization curves of nanoparticles injected into a mice. This allowed us to relia

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43

López-Estrada, Omar, Emilio Orgaz, and Francesca Baletto. "Interdependence of shape and magnetic properties in Al-nanoparticles doped with Ni and Pt." Journal of Materials Chemistry C 8, no. 7 (2020): 2533–41. http://dx.doi.org/10.1039/c9tc04013g.

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By means of ab initio molecular dynamics, we investigate the magnetic behaviour of Al, AlNi and AlPt nanoparticles of 19 atoms. New geometrical shapes are detected and a depression of the total magnetization is associated with geometrical reconstructions where the fivefold symmetry character is lost, independently of the chemical doping.

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dos Santos, Gonzalo, Robert Meyer, Romina Aparicio, Julien Tranchida, Eduardo M. Bringa, and Herbert M. Urbassek. "Spin-lattice dynamics of surface vs core magnetization in Fe nanoparticles." Applied Physics Letters 119, no. 1 (2021): 012404. http://dx.doi.org/10.1063/5.0055606.

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Serpico, C., G. Bertotti, M. d'Aquino, C. Ragusa, P. Ansalone, and I. D. Mayergoyz. "Path Integral Approach to Stochastic Magnetization Dynamics in Uniaxial Ferromagnetic Nanoparticles." IEEE Transactions on Magnetics 44, no. 11 (2008): 3157–60. http://dx.doi.org/10.1109/tmag.2008.2001793.

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Denisov, S. I., T. V. Lyutyy, B. O. Pedchenko, and H. V. Babych. "Eddy current effects in the magnetization dynamics of ferromagnetic metal nanoparticles." Journal of Applied Physics 116, no. 4 (2014): 043911. http://dx.doi.org/10.1063/1.4891455.

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Coduri, Mauro, Paolo Masala, Lucia Del Bianco, et al. "Local Structure and Magnetism of Fe2O3 Maghemite Nanocrystals: The Role of Crystal Dimension." Nanomaterials 10, no. 5 (2020): 867. http://dx.doi.org/10.3390/nano10050867.

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Here we report on the impact of reducing the crystalline size on the structural and magnetic properties of γ-Fe2O3 maghemite nanoparticles. A set of polycrystalline specimens with crystallite size ranging from ~2 to ~50 nm was obtained combining microwave plasma synthesis and commercial samples. Crystallite size was derived by electron microscopy and synchrotron powder diffraction, which was used also to investigate the crystallographic structure. The local atomic structure was inquired combining pair distribution function (PDF) and X-ray absorption spectroscopy (XAS). PDF revealed that reduci

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Botez, Cristian E., and Zachary Mussslewhite. "Evidence of Individual Superspin Relaxation in Diluted Fe3O4/Hexane Ferrofluids." Materials 16, no. 13 (2023): 4850. http://dx.doi.org/10.3390/ma16134850.

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We used dc magnetization and ac susceptibility to investigate the magnetic relaxation of ferrofluids made of 8 nm average-diameter Fe3O4 nanoparticles dispersed in hexane. Samples of different concentrations (δ) spanning two orders of magnitude ranging from 0.66 to 0.005 mg (Fe3O4)/mL (hexane) were used to vary the interparticle interaction strength. Our data reveal a critical concentration, δc = 0.02 mg/mL, below which the ferrofluid behaves like an ideal nanoparticle ensemble where the superspins relax individually according to a Néel–Brown activation law τ(T) =τ0expEBkBT with a characterist

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Gorn, Natalia L., Elena K. Semenova, and Dmitry Berkov. "Local Energy Minima and Density of Energy Barriers in Dense Clusters of Magnetic Nanoparticles." Inorganics 12, no. 12 (2024): 329. https://doi.org/10.3390/inorganics12120329.

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In this paper, we focus on the properties of local energy minima and energy barriers in immobilized dense clusters of magnetic nanoparticles. Understanding of these features is highly interesting both for the fundamental physics of disordered systems with long-range interparticle interaction and for numerous applications of modern ferrofluids consisting of such clusters. In particular, it is needed to predict the ac-susceptibility of these systems and their magnetization relaxation after a sudden change in the external field, because both processes occur via magnetization jumps over energy bar

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Sharma, Vikash, Sudip Pal, Divya Sharma, Dinesh Kumar Shukla, Ram Janay Chaudhary, and Gunadhor Singh Okram. "Size-induced exchange bias in single-phase CoO nanoparticles." Nanotechnology 35, no. 27 (2024): 275702. http://dx.doi.org/10.1088/1361-6528/ad3256.

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Abstract The tuning of exchange bias (EB) in nanoparticles has garnered significant attention due to its diverse range of applications. Here, we demonstrate EB in single-phase CoO nanoparticles, where two magnetic phases naturally emerge as the crystallite size decreases from 34.6 ± 0.8 to 10.8 ± 0.9 nm. The Néel temperature (T N) associated with antiferromagnetic ordering decreases monotonically with the reduction in crystallite size, highlighting the significant influence of size effects. The 34.6 nm nanoparticles exhibit magnetization irreversibility between zero-field cooled (ZFC) and fiel

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