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Journal articles on the topic 'Magnetocaloric effect'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2025

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1

Zarkevich, Nikolai A., and Vladimir I. Zverev. "Viable Materials with a Giant Magnetocaloric Effect." Crystals 10, no. 9 (September 15, 2020): 815. http://dx.doi.org/10.3390/cryst10090815.

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This review of the current state of magnetocalorics is focused on materials exhibiting a giant magnetocaloric response near room temperature. To be economically viable for industrial applications and mass production, materials should have desired useful properties at a reasonable cost and should be safe for humans and the environment during manufacturing, handling, operational use, and after disposal. The discovery of novel materials is followed by a gradual improvement of properties by compositional adjustment and thermal or mechanical treatment. Consequently, with time, good materials become inferior to the best. There are several known classes of inexpensive materials with a giant magnetocaloric effect, and the search continues.
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2

Gomes, M. B., N. A. de Oliveira, P. J. von Ranke, and A. Troper. "Magnetocaloric effect in." Journal of Magnetism and Magnetic Materials 321, no. 24 (December 2009): 4006–9. http://dx.doi.org/10.1016/j.jmmm.2009.07.071.

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3

Reis, M. S. "Oscillating magnetocaloric effect." Applied Physics Letters 99, no. 5 (August 2011): 052511. http://dx.doi.org/10.1063/1.3615296.

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4

Gomes, M. B., and N. A. de Oliveira. "Magnetocaloric effect in." Journal of Magnetism and Magnetic Materials 301, no. 2 (June 2006): 503–12. http://dx.doi.org/10.1016/j.jmmm.2005.07.028.

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5

de Oliveira, N. A. "Magnetocaloric effect in." Journal of Magnetism and Magnetic Materials 320, no. 14 (July 2008): e150-e152. http://dx.doi.org/10.1016/j.jmmm.2008.02.037.

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6

Taskaev, Sergey, Konstantin Skokov, Dmitriy Karpenkov, Vladimir V. Khovaylo, Vasiliy D. Buchelnikov, D. A. Zherebtsov, Maxim Ulyanov, Dmitriy Bataev, Anatoliy Pellenen, and Alfiya Fazlitdinova. "The Influence of Cold Rolling on Magnetocaloric Properties of Gd100-xYx (x = 0, 5, 10, 15) Alloys." Solid State Phenomena 233-234 (July 2015): 238–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.238.

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In this work we report the results of investigation of the magnetocaloric effect in Gd100-xYx (x= 0, 5, 10, 15) cold rolled ribbons. It is shown that the magnetocaloric effect exists within a wide temperature interval 258-295 K and it is comparable with the magnetocaloric effect observed in bulk samples of pure gadolinium. The value of the magnetocaloric effect in the rolled samples is reduced in comparison with the bulk samples and strongly depends on a degree of plastic deformation. High temperature heat treatment can restore a value of the magnetocaloric effect in the cold rolled ribbons up to initial ones. Thus, cold rolling is proposed to be a promising technique for producing thin forms of magnetocaloric materials for heat exchangers of magnetic cooling devices.
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7

Dvoreckaia E. V., Sidorov V. L., Koplak O. V., Korolev D. V., Piskorsky V. P., Valeev R. A., and Morgunov R. B. "Magnetocaloric effect in amorphous-crystalline microcircuits PrDyFeCoB." Physics of the Solid State 64, no. 8 (2022): 989. http://dx.doi.org/10.21883/pss.2022.08.54615.373.

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In amorphous-crystalline PrDyFeCoB microconductors obtained by ultrafast melt cooling, a negative magnetocaloric effect was detected at 200-250 K (with heat release when the magnetic field is turned on), as well as a positive magnetocaloric effect in the temperature range of 300-340 K (with heat absorption when the magnetic field is turned on). It is established that there are no phase transitions of the first kind in the studied temperature range, which indicates that both of the detected effects are associated with a change in the magnetic part of the entropy. The transition at 200-250 K is due to the presence of metamagnetic states induced by a magnetic field in the spin-glass state of the amorphous part of the PrDyFeCoB alloy, and with their transition to the ferrimagnetic state. The transition at 300-340 K is spin-reorientation, and it occurs in crystalline inclusions identified in the amorphous matrix. Keywords: spin-reorientation transition, spin glass, magnetocaloric effect, entropy. Keywords: spin-reorientation transition, spin glass, magnetocaloric effect, entropy.
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8

Taskaev, Sergey, Konstantin Skokov, Dmitriy Karpenkov, Vladimir V. Khovaylo, Vasiliy D. Buchelnikov, D. A. Zherebtsov, Maxim Ulyanov, Dmitry Bataev, Damir Galimov, and Anatoliy Pellenen. "Magnetocaloric Properties of Cold Rolled Gd100-xZrx (x = 0, 1, 2, 3) Intermetallic Alloys." Solid State Phenomena 233-234 (July 2015): 220–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.220.

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In this work we report the results of experimental investigation of the magnetocaloric effect in Gd100-xZrx(x= 0, 1, 2, 3) cold rolled ribbons. As it is shown the magnetocaloric effect exist within the large temperature interval 279-295 K and comparable with magnetocaloric effect observed on pure Gd. As it shown cold rolling is one of promising techniques for producing thin forms of magnetocaloric materials for heat exchangers of magnetic cooling devices.
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9

Zvyagin, A. A., and G. A. Zvyagina. "Magnetocaloric effect in UTe2: Theory predictions." Low Temperature Physics 50, no. 7 (July 1, 2024): 549–57. http://dx.doi.org/10.1063/10.0026281.

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Two simple effective models for the low-temperature (however higher than the temperature of the transition to the superconducting phase) behavior of magnetic and magnetocaloric characteristics in the external magnetic field in UTe2 are proposed. The models are based on the dual nature of 5f electrons and take into account both itinerant electrons and localized electrons of U ions. Several magnetic characteristics including the magnetocaloric ones have been calculated for those scenarios. It is expected that by observing the features of the characteristics of the magnetocaloric effect in UTe2 and comparing them with the ones, predicted by the theory, one can choose the model, that can better describe the specific magnetic properties of UTe2 at low temperatures in the normal phase.
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10

Hamad, Mahmoud. "Magnetocaloric properties of La0.666Sr0.373Mn0.943Cu0.018O3." Processing and Application of Ceramics 11, no. 3 (2017): 225–28. http://dx.doi.org/10.2298/pac1703225h.

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Magnetocaloric properties of La0.666Sr0.373Mn0.943Cu0.018O3 (LSMCO) perovskite (such as magnetic entropy change, full-width at half-maximum, relative cooling power and magnetic specific heat change) at applied magnetic field of 0.05 T were calculated using the phenomenological model. The results indicate the prospective application of LSMCO due to high magnetocaloric effect near the Curie temperature. Furthermore, the magnetocaloric properties of LSMCO sample are comparable with magnetocaloric properties of MnAs film, La1-xCdxMnO3 and La1.25Sr0.75MnCoO6, and significantly larger than that of Gd1-xCaxBaCo2O5.5 and Ge0.95Mn0.05. It is recommended that magnetocaloric effect of LSMCO can be used as a promising practical material of an apparatus based on the active magnetic regenerator cycle.
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11

Pankratov, N. Yu, I. S. Tereshina, and S. A. Nikitin. "Magnetocaloric Effect in Rare-Earth Magnetic Materials." Физика металлов и металловедение 124, no. 11 (November 1, 2023): 1093–101. http://dx.doi.org/10.31857/s0015323023601095.

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Abstract—A study of the magnetocaloric characteristics of rare-earth magnets was carried out. There were studied a systems Gd–H, (Gd,R)Ni–H containing hydrogen (R is a rare earth metal); system RCo2–H with the structure of Laves phases; and systems without hydrogen, such as RTX intermetalic compounds (T = Mn, Fe, Co; X = Si), R2(Fe,T)17 compounds (T = Al), which have a magnetic compensation point and exhibit an alternating magnetocaloric effect (MCE). The MCE was measured by the direct method and calculated indirectly from the field dependences of the magnetization. The main regularities are established and the specific features of the formation of magnetocaloric properties are revealed depending on the composition and structure.
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12

Mulyukov, Kh Ya, I. I. Musabirov, and A. V. Mashirov. "Magnetocaloric effect Ni2MnIn alloy." Letters on Materials 2, no. 4 (2012): 194–97. http://dx.doi.org/10.22226/2410-3535-2012-4-194-197.

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13

Arora, Parul, Pragya Tiwari, V. G. Sathe, and M. K. Chattopadhyay. "Magnetocaloric effect in DyCu2." Journal of Magnetism and Magnetic Materials 321, no. 19 (October 2009): 3278–84. http://dx.doi.org/10.1016/j.jmmm.2009.05.062.

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14

Chen, X., and Y. H. Zhuang. "Magnetocaloric effect of Gd12Co7." Solid State Communications 148, no. 7-8 (November 2008): 322–25. http://dx.doi.org/10.1016/j.ssc.2008.08.036.

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15

Wada, H., S. Tomekawa, and M. Shiga. "Magnetocaloric effect of ErCo2." Journal of Magnetism and Magnetic Materials 196-197 (May 1999): 689–90. http://dx.doi.org/10.1016/s0304-8853(98)00894-4.

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16

Sampathkumaran, E. V., I. Das, R. Rawat, and Subham Majumdar. "Magnetocaloric effect in Gd2PdSi3." Applied Physics Letters 77, no. 3 (July 17, 2000): 418–20. http://dx.doi.org/10.1063/1.126995.

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17

Koroleva, L. I., D. M. Zashchirinskii, A. S. Morozov, and R. Szymczak. "Magnetocaloric effect in manganites." Journal of Experimental and Theoretical Physics 115, no. 4 (October 2012): 653–61. http://dx.doi.org/10.1134/s1063776112100044.

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18

Arora, Parul, M. K. Chattopadhyay, and S. B. Roy. "Magnetocaloric effect in MnSi." Applied Physics Letters 91, no. 6 (August 6, 2007): 062508. http://dx.doi.org/10.1063/1.2768005.

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19

Szymczak, R., K. Dyakonov, I. Radelytskyi, V. Dyakonov, and H. Szymczak. "Magnetocaloric Effect in La0.8Sr0.2MnO3Film." Acta Physica Polonica A 128, no. 1 (July 2015): 56–58. http://dx.doi.org/10.12693/aphyspola.128.56.

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20

Zimm, C. B., J. A. Barclay, H. H. Harkness, G. F. Green, and W. G. Patton. "Magnetocaloric effect in thulium." Cryogenics 29, no. 9 (September 1989): 937–38. http://dx.doi.org/10.1016/0011-2275(89)90210-5.

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21

Vasylyev, D., O. Syshchenko, V. Sechovský, J. Šebek, Yu Stadnyk, Ya Mudryk, and L. Romaka. "Magnetocaloric effect in Er6Ni2Sn." Czechoslovak Journal of Physics 52, S1 (January 2002): A205—A208. http://dx.doi.org/10.1007/s10582-002-0049-5.

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22

Hamad, Mahmoud A. "Magnetocaloric effect in La1.25Sr0.75MnCoO6." Journal of Thermal Analysis and Calorimetry 115, no. 1 (August 29, 2013): 523–26. http://dx.doi.org/10.1007/s10973-013-3362-2.

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23

McMichael, R. D., R. D. Shull, L. J. Swartzendruber, L. H. Bennett, and R. E. Watson. "Magnetocaloric effect in superparamagnets." Journal of Magnetism and Magnetic Materials 111, no. 1-2 (June 1992): 29–33. http://dx.doi.org/10.1016/0304-8853(92)91049-y.

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24

Dixey, Richard J. C., Pascal Manuel, Fabio Orlandi, Paromita Mukherjee, Siân E. Dutton, Gavin B. G. Stenning, and Paul J. Saines. "In situ observation of the magnetocaloric effect through neutron diffraction in the Tb(DCO2)3 and TbODCO3 frameworks." Journal of Materials Chemistry C 8, no. 35 (2020): 12123–32. http://dx.doi.org/10.1039/d0tc03153d.

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Understanding large entropy changes in efficient magnetocaloric materials is essential to design next-generation magnetocaloric devices. We report the large entropy change mechanism in two efficient magnetocaloric materials – TbODCO3 and Tb(DCO2)3.
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25

Wen, Da, Ze Yu Zhang, Yi Long, Rong Chang Ye, Zhuhong Liu, and Guang Heng Wu. "Magnetic Entropy Changes in Ni54.9Mn20.5Ga24.6 Alloy." Materials Science Forum 475-479 (January 2005): 2243–46. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2243.

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Giant magnetocaloric effect based on first order phase transformation has been investigated extensively recently. A considerable magnetic entropy change has been found in single crystal Ni52.6Mn23.1Ga24.3, Ni53Mn22Ga25 and polycrystal Ni51.5Mn22.7Ga25.8.This change originated from a sharp magnetization jump caused by the martensitic-austenitic structure transition on heating. In this paper, magnetocaloric effect in the alloys Ni54.9Mn20.5Ga24.6 is studied. The Curie point temperature Tc of the alloy is adjusted to the vicinity of martensitic transition temperature Tm. The concurrence of martensitic structure transition and magnetic phase transition enhance the magnetocaloric effect in these alloys. The martensitic structure transition effect on the magnetic properties of the alloys is investigated. The character of magnetocaloric effect during the transition from the austenitic to martensitic state is discussed.
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26

Taskaev, Sergey, Vasiliy D. Buchelnikov, Anatoliy Pellenen, Dmitriy Bataev, Konstantin Skokov, Vladimir Khovaylo, and Akhmed Aliev. "Magnetocaloric and other Properties of Cold Rolled Gd Ribbons." Materials Science Forum 738-739 (January 2013): 441–45. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.441.

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In this work we investigate magnetocaloric effect and heat capacity of Gd cold rolled ribbons. Such materials are easy to produce, they are flexible and convenient for using in magnetic cooling devices. It is shown that the magnetocaloric effect is strongly dependent on thickness of the ribbons. Severely rolled ribbons demonstrate rather a small magnetocaloric effect. However, a special heat treatment procedure makes it possible to enhance the effect up to the value observed in polycrystalline Gd.
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27

Cha, Jongchol, Fenghua Li, and Jinhyok Jon. "Investigation of magnetocaloric effect in La0.67Sr0.33Mn1-xZrxO3." Journal of Physics: Conference Series 2300, no. 1 (June 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2300/1/012001.

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Abstract The influence of Zr-doping on the magnetocaloric effect of La0.67Sr0.33Mn1-xZrxO3 manganese perovskites in low magnetic field has been investigated. Using Hamad’s phenomenological model, we have estimated the important magnetocaloric properties, for example, the thermal magnetization, the change of magnetic entropy and the relative cooling power. We have shown that the magnetocaloric properties decrease as the increase of the dopant amount. Tunable magnetocaloric effect in these compounds is advantageous to magnetic refrigeration applications in wide temperature ranges. Therefore, these compounds are good candidates for working materials in magnetic refrigeration.
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28

Wlodarczyk, P., L. Hawelek, P. Zackiewicz, M. Kaminska, A. Chrobak, and A. Kolano-Burian. "Effect of changing P/Ge and Mn/Fe ratios on the magnetocaloric effect and structural transition in the (Mn,Fe)2 (P,Ge) intermetallic compounds." Materials Science-Poland 34, no. 3 (September 1, 2016): 494–502. http://dx.doi.org/10.1515/msp-2016-0068.

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AbstractThe magnetocaloric effect in the MnxFe2−xP1−yGey intermetallic compounds with the amount of Mn in the range of x = 1.05 to 1.17 and amount of Ge in the range of y = 0.19 to 0.22 has been studied. It was found that a higher Ge/P ratio causes an increase in Curie temperature, magnetocaloric effect at low field (up to 1 T), activation energy of structural transition and a decrease in thermal hysteresis, as well as transition enthalpy. Contrary to this observation, higher Mn/Fe ratio causes a decrease in Curie temperature, slight decrease of magnetocaloric effect at low magnetic field, and an increase in thermal hysteresis. Simultaneous increase of both ratios may be very advantageous, as the thermal hysteresis can be lowered and magnetocaloric effect can be enhanced without changing the Curie temperature. Some hints about optimization of the composition for applications at low magnetic fields (0.5 T to 2 T) have been presented.
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29

Pashenkin I. Yu., Polushkin N. I., Sapozhnikov M. V., Demidov E. S., Kravtsov E. A., and Fraerman A. A. "Enhancement of magnetocaloric efficiency of Gd spacer between strong ferromagnets." Physics of the Solid State 64, no. 10 (2022): 1343. http://dx.doi.org/10.21883/pss.2022.10.54215.30hh.

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The magnetocaloric properties of a thin spacer of gadolinium (Gd) between layers of "strong" ferromagnets (relatively high Curie temperatures) are studied experimentally. It is found that, at room temperatures, the magnetocaloric efficiency Delta S/Delta H (Delta S is the isothermal magnetic entropy change and Delta H is the range of applied magnetic fields) of Gd spacer of thickness of 3 nm is up to two orders in magnitude higher than this value in an individual thicker (30 nm) Gd layer. This opens up opportunities for using the magnetocaloric effect in micro(nano)electronics and biomedicine using relatively weak magnetic fields H<1 kOe. The observed increase in the magnetocaloric efficiency is explained by the influence of direct exchange coupling between Gd spacer and its surroundings, which changes the distribution of magnetization in the spacer and, ultimately, its magnetocaloric potential. Keywords: magnetocaloric effect, magnetic heterostructures, exchange coupling at interfaces, Curie temperature.
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30

Maiorino, Angelo, Manuel Gesù Del Duca, Jaka Tušek, Urban Tomc, Andrej Kitanovski, and Ciro Aprea. "Evaluating Magnetocaloric Effect in Magnetocaloric Materials: A Novel Approach Based on Indirect Measurements Using Artificial Neural Networks." Energies 12, no. 10 (May 16, 2019): 1871. http://dx.doi.org/10.3390/en12101871.

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The thermodynamic characterisation of magnetocaloric materials is an essential task when evaluating the performance of a cooling process based on the magnetocaloric effect and its application in a magnetic refrigeration cycle. Several methods for the characterisation of magnetocaloric materials and their thermodynamic properties are available in the literature. These can be generally divided into theoretical and experimental methods. The experimental methods can be further divided into direct and indirect methods. In this paper, a new procedure based on an artificial neural network to predict the thermodynamic properties of magnetocaloric materials is reported. The results show that the procedure provides highly accurate predictions of both the isothermal entropy and the adiabatic temperature change for two different groups of magnetocaloric materials that were used to validate the procedure. In comparison with the commonly used techniques, such as the mean field theory or the interpolation of experimental data, this procedure provides highly accurate, time-effective predictions with the input of a small amount of experimental data. Furthermore, this procedure opens up the possibility to speed up the characterisation of new magnetocaloric materials by reducing the time required for experiments.
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Gupta, Preeti, and Pankaj Poddar. "Study of magnetic and thermal properties of SmCrO3 polycrystallites." RSC Advances 6, no. 85 (2016): 82014–23. http://dx.doi.org/10.1039/c6ra17203b.

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SmCrO3 polycrystallites exhibits inverse and normal magnetocaloric effect at and around spin reorientation transition (TSR) along with normal magnetocaloric effect at Néel transition (TN).
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32

Lewis, L. H., M. H. Yu, and R. J. Gambino. "Simple enhancement of the magnetocaloric effect in giant magnetocaloric materials." Applied Physics Letters 83, no. 3 (July 21, 2003): 515–17. http://dx.doi.org/10.1063/1.1593821.

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33

Cha, Jongchol, Fenghua Li, Jinhyok Jon, and Jongchol Kim. "Estimation of magnetocaloric effect by means of phenomenological model in La0.67Ca0.33-xSrxMnO3 (x=0.035, 0.065) perovskite manganite." Journal of Physics: Conference Series 2285, no. 1 (June 1, 2022): 012035. http://dx.doi.org/10.1088/1742-6596/2285/1/012035.

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Abstract The magnetocaloric effect in the perovskite manganite La0.67Ca0.33-xSrxMnO3 with x=0.035, 0.065 have been investigated. Using Hamad’s phenomenological model, we have estimated the important magnetocaloric properties, for example, the thermal magnetization, the change of magnetic entropy and the relative cooling power. Considerable and tunable magnetocaloric effect in these compounds is advantageous to applications in near-room-temperature magnetic refrigeration. Therefore, these compounds are good candidates for working materials in magnetic refrigeration.
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34

Nikitin, S. A., Anatoly E. Bogdanov, Ioulia A. Ovchenkova, Evgeniy A. Ovchenkov, Andrey V. Smirnov, and Alexander V. Morozkin. "Magnetocaloric and Magnetoelastic Properties of the Gd5Si2Ge2 with Small Indium Substitutions in p-Sublattice." Solid State Phenomena 233-234 (July 2015): 208–11. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.208.

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The purpose of this work was the complex investigation of magnetic, magnetocaloric and magnetoelastic properties of compounds based on Gd5Si2Ge2 with small In substitutions in p-sublattice. The conducted measurements revealed that both the magnetocaloric effect and the volume magnetostriction upon cooling reach the higher values than upon heating. Indium substitution leads to the appearance of the second maximum on the temperature dependence of the magnetocaloric effect resulting in the increase of the refrigerant capacity.
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35

Planes, Antoni, Lluís Mañosa, Xavier Moya, Jordi Marcos, Mehmet Acet, Thorsten Krenke, Seda Aksoy, and Eberhard F. Wassermann. "Magnetocaloric and Shape-Memory Properties in Magnetic Heusler Alloys." Advanced Materials Research 52 (June 2008): 221–28. http://dx.doi.org/10.4028/www.scientific.net/amr.52.221.

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In this paper, we discuss the magnetocaloric behavior of Ni-Mn-based Heusler alloys in rela- tion to their shape-memory and superelastic properties. We show that the magnetocaloric effect in these materials originates from two different contributions: (i) the coupling that is related to a strong uniaxial magnetic anisotropy and takes place at the length scale of martensite variants and magnetic domains (extrinsic effect), and (ii) the intrinsic microscopic magnetostructural coupling. The first contribution is intimately related to the magnetically induced rearrange- ment of martensite variants (magnetic shape-memory) and controls the magnetocaloric effect at small applied fields, while the latter is dominant at higher fields and is essentially related to the possibility of magnetically inducing the martensitic transition (magnetic superelasticity). The possibility of inverse magnetocaloric effect associated with these two contributions is also considered.
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Shen, Hongxian, Nguyen Thi My Duc, Hillary Belliveau, Lin Luo, Yunfei Wang, Jianfei Sun, Faxiang Qin, and Manh-Huong Phan. "Advanced magnetocaloric microwires: What does the future hold?" Ministry of Science and Technology, Vietnam 65, no. 4 (December 15, 2023): 14–24. http://dx.doi.org/10.31276/vjste.65(4).14-24.

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Magnetic refrigeration (MR) based on the magnetocaloric effect (MCE) is a promising alternative to conventional vapor compression refrigeration techniques. The cooling efficiency of a magnetic refrigerator depends on its refrigeration capacity and operation frequency. Existing refrigerators possess limited cooling efficiency due to the low operating frequency (around tens of Hz). Theory predicts that reducing geometrical effects can increase the operation frequency by reducing the relaxation time of a magnetic material. As compared to other shapes, magnetocaloric wires transfer heat most effectively to a surrounding environment, due to their enhanced surface area. The wire shape also yields a good mechanical response, reducing the relaxation time and consequently increasing the operation frequency of the cooling device. Experiments have validated the theoretical predictions. By assembling microwires with different magnetocaloric properties and Curie temperatures into a laminate structure, a table-like magnetocaloric bed can be created and used as an active cooling device for micro-electro-mechanical system (MEMS) and nano-electro-mechanical system (NEMS). This paper assesses recent progress in the development of magnetocaloric microwires and sheds light on the important factors affecting the magnetocaloric behavior and cooling efficiency in microwire systems. Challenges, opportunities, and strategies regarding the development of advanced magnetocaloric microwires are also discussed.
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37

UTARBEKOVA, M. V., M. A. ORSHULEVICH, D. S. BATAEV, A. G. FAZLITDINOVA, and S. V. TASKAEV. "MAGNETOCALORIC EFFECT IN R5SI4 (R = TB, DY, HO) ALLOYS." Челябинский физико-математический журнал 9, no. 4 (November 11, 2024): 670–81. https://doi.org/10.47475/2500-0101-2024-9-4-670-681.

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Experimental studies of the structural, magnetic and magnetocaloric properties of polycrystalline alloys Tb5Si4, Dy5Si4, Ho5Si4 in external magnetic fields up to 3 T have been carried out, and changes in the magnetic part of the entropy in higher fields of 20 T generated by superconducting magnetic systems have been calculated. Magnetic measurements have shown that these compounds have a low coercive force and reach saturation in small fields. It has been established that the magnetocaloric effect in the studied compounds is observed in a wide temperature range, and for intermetallides Tb5Si4, Dy5Si4, Ho5Si4 has several areas of existence comparable in magnitude of the effect. The presence of several intervals of the existence of the magnetocaloric effect is caused by a series of magnetic phase transitions in these ferrimagnetic compounds.
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38

Cho, Keunki, Wonhyuk Shon, Jaehan Bae, Jaewoong Lee, Seungha Yoon, Jinhee Kim, Jong-Soo Rhyee, and Beongki Cho. "Anisotropic Metamagnetic Spin Reorientation and Rotational Magnetocaloric Effect of Single Crystal NdAlGe." Materials 16, no. 7 (March 30, 2023): 2771. http://dx.doi.org/10.3390/ma16072771.

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Magnetic anisotropy strongly influences the performance of the magnetocaloric effect. We investigated the magnetocaloric properties of the NdAlGe single crystal with I41md structure. The temperature-dependent magnetization revealed significant anisotropic properties; stable antiferromagnetic transition at TN = 6 K for H//a and meta-magnetic spin reorientation at low temperature (T ≤ 5 K) within an intermediate field (H = 2 T) for H//c. During the metamagnetic spin reorientation, the abrupt change of the magnetic entropy leads to a significant magnetocaloric effect with negative magnetic entropy change (∆SM) by −13.80 J kg−1 K−1 at TC = 5.5 K for H = 5 T along the H//c axis. In addition, the antiferromagnetic state for H//a shows the inverse magnetocaloric effect(I-MCE) by positive entropy change ∆SM = 2.64 J kg−1 K−1 at TN = 6 K for H = 5 T. This giant MCE accompanied by the metamagnetic transition resulted in a significantly large relative cooling power (158 J/kg at H = 5 T) for H//c. The giant MCE and I-MCE can be applied to the rotational magnetocaloric effect (R-MCE) depending on the crystal orientations. NdAlGe exhibits rotational entropy change ∆Sc−a = −12.85 J kg−1 K at Tpeak = 7.5 K, H = 5 T. With comparison to conventional MCE materials, NdAlGe is suggested as promising candidate of R-MCE, which is a novel type of magnetic refrigeration system.
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39

Pal, Arnab, Zhenjie Feng, Hao Wu, Ke Wang, Jingying Si, Jiafeng Chen, Yanhong Chen, et al. "Investigation of field-controlled magnetocaloric switching and magnetodielectric phenomena in spin-chain compound Er2BaNiO5." Journal of Physics D: Applied Physics 55, no. 13 (December 30, 2021): 135001. http://dx.doi.org/10.1088/1361-6463/ac44c3.

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Abstract The Haldane spin-chain compound Er2BaNiO5 has been known to possess magnetoelectric coupling below the magnetic ordering temperature. Here we report various low-temperature magnetic and magnetocaloric properties, and magnetodielectric (MD) effect above magnetic ordering temperature in this compound. The present compound displays a coexistence of conventional and inverse magnetocaloric effects with a large entropy change of 5.9 and −2.5 J kg−1 K−1, respectively. Further, it exhibits a remarkable switching between them, which can be tuned with temperature and magnetic field. In addition, evolution of two magnetic field-dependent metamagnetic transitions at 19.7 and 27.7 kOe, and their correlation with magnetocaloric switching effect, make this compound effective for potential applications. On the other hand, demonstration of intrinsic MD effect (1.9%) near and above antiferromagnetic ordering temperature, through a moderate coupling between electric dipoles and magnetic spins, establishes this compound as a useful candidate for future research. A detailed analysis of these findings, in a framework of different magnetic interactions and magnetocrystalline anisotropies, is discussed here. Overall, these results may provide a future pathway to tune the magnetic, MD, and magnetocaloric properties in this compound toward better application potential.
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40

Hamad, Mahmoud. "Magnetocaloric effect in Sr2FeMoO6/Ag composites." Processing and Application of Ceramics 9, no. 1 (2015): 11–15. http://dx.doi.org/10.2298/pac1501011h.

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The enhanced low-field magnetocaloric effect was investigated for double perovskite Sr2FeMoO6 - silver (SFMO/Ag) composites with 0, 5 and 10 wt.% of Ag. A phenomenological model was used to predict magnetocaloric properties of SFMO/Ag composites, such as magnetic entropy change, heat capacity change and relative cooling power. It was shown that magnetic entropy change (?S M) peaks of SFMO/Ag span over a wide temperature region, which can significantly improve the global efficiency of the magnetic refrigeration. Furthermore, the ?S M distribution of the SFMO/Ag composites is much more uniform than that of gadolinium. Through these results, SFMO/Ag composite has some potential application for magnetic refrigerants in an extended high-temperature range.
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41

Старков, А. С., О. В. Пахомов, В. В. Родионов, А. А. Амиров, and И. А. Старков. "Оценка термодинамической эффективности работы твердотельных охладителей и генераторов на мультикалорическом эффекте." Журнал технической физики 89, no. 4 (2019): 590. http://dx.doi.org/10.21883/jtf.2019.04.47318.34-18.

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AbstractThe efficiency of using the multicaloric effect (μCE) in solid-state cooling systems is investigated and compared with single caloric effects. The proposed approach is illustrated by the example of the Brighton cycle for μCE and the magnetocaloric effect. Based on the conducted experiments for the two-layer composite Fe_48Rh_52–PbZr_0.53Ti_0.47O_3, the dependence of relative efficiency on temperature is constructed and the temperature range is estimated, where μCE has an advantage over the magnetocaloric effect. The comparison of the developed theory of the μCE with the obtained experimental data is performed.
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42

Negrete, Oscar, Francisco Peña, and Patricio Vargas. "Magnetocaloric Effect in an Antidot: The Effect of the Aharonov-Bohm Flux and Antidot Radius." Entropy 20, no. 11 (November 19, 2018): 888. http://dx.doi.org/10.3390/e20110888.

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In this work, we report the magnetocaloric effect (MCE) for an electron interacting with an antidot, under the effect of an Aharonov-Bohm flux (AB-flux) subjected to a parabolic confinement potential. We use the Bogachek and Landman model, which additionally allows the study of quantum dots with Fock-Darwin energy levels for vanishing antidot radius and AB-flux. We find that AB-flux strongly controls the oscillatory behaviour of the MCE, thus acting as a control parameter for the cooling or heating of the magnetocaloric effect. We propose a way to detect AB-flux by measuring temperature differences.
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43

Korolev, Viktor V., Anna G. Ramazanova, Olga V. Balmasova, and Matvey S. Gruzdev. "MAGNETOCALORIC EFFECT AND HEAT CAPACITY OF MAGNETIC FLUIDS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 5 (April 13, 2020): 12–18. http://dx.doi.org/10.6060/ivkkt.20206305.6148.

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The magnetic fluids based on magnetite nanoparticles were synthesized using mixed surfactants (oleic acid/alkenyl succinic anhydride) dispersed in different carrier media (polyethylsiloxane and dialkyldiphenyl). The physicochemical properties of magnetic fluids (density, viscosity, saturation magnetization, magnetic phase concentration, magnetic core size) were determined. Magnetic fluids are stable in a wide temperature range. All the samples of the magnetic fluids exhibit typical superparamagnetic behavior. The magnetocaloric effect and the specific heat capacity of the magnetic fluids were first direct determined at 288–350 K in a magnetic field of 0–1.0 T. The field dependences of the magnetocaloric effect have a classic linear form. The temperature dependences of the magnetocaloric effect of magnetic fluids in magnetic fields have an extreme character. Thermodynamic parameters of magnetic fluids (magnetization namely enthalpy/entropy change) were determined. The specific heat capacity of magnetic fluid samples in a zero magnetic field was obtained at different temperatures (at 278–350 K) on a differential scanning calorimeter and on the original microcalorimeter. The temperature dependences of the heat capacity of magnetic fluids in magnetic fields have an extreme character. It was established that the difference in heat capacity values obtained in and without the magnetic field is within the experimental error. The extreme character of the heat capacity is reflected in the magnetocaloric effect temperature dependences.
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44

Терешина, И. С., Г. А. Политова, В. А. Четырбоцкий, Е. А. Терешина-Хитрова, М. А. Пауков, and А. В. Андреев. "Влияние гидрирования на магнитострикцию и магнитокалорический эффект в монокристалле гадолиния." Физика твердого тела 61, no. 2 (2019): 230. http://dx.doi.org/10.21883/ftt.2019.02.47118.253.

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AbstractThe gadolinium single crystal obtained by the Czochralski method was hydrogenated to the composition GdH_0.15, which corresponds to a metal–hydrogen solid solution (α phase). The magnetostriction and magnetocaloric effect were measured for both the initial and hydrogenated samples. It is found that the hydrogen atoms in the hexagonal lattice of gadolinium can affect the magnitude and sign of the magnetostriction constants and cause the anisotropy of the magnetocaloric effect. The main mechanisms responsible for the observed effects are discussed.
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45

Kassan-Ogly, Felix A., Elena E. Kokorina, and M. V. Medvedev. "Peculiarities of the Magnetocaloric Effect in an Isotropic Antiferromagnet." Solid State Phenomena 215 (April 2014): 66–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.66.

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It is shown that the magnetocaloric effects are absent in the spin-flop phase of an isotropic antiferromagnet at the T<TN (TN the Neel temperature) and appear only when an applied magnetic field exceeds the critical field of the spin-flip transition. It is displayed as well that the direct magnetocaloric effects in an antiferromagnet above TN are much less that the analogous effects in a ferromagnet above the Curie point TC.
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46

Sahu, Baidyanath, R. Djoumessi Fobasso, Buyisiwe M. Sondezi, and André M. Strydom. "Large magnetocaloric effect in Ho2Pd2Pb." Materials Today Communications 31 (June 2022): 103327. http://dx.doi.org/10.1016/j.mtcomm.2022.103327.

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47

Wang, J. L., S. J. Campbell, J. M. Cadogan, A. J. Studer, R. Zeng, and S. X. Dou. "Magnetocaloric effect in layered NdMn2Ge0.4Si1.6." Applied Physics Letters 98, no. 23 (June 6, 2011): 232509. http://dx.doi.org/10.1063/1.3599456.

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48

Szymczak, R., R. Kolano, A. Kolano-Burian, V. P. Dyakonov, and H. Szymczak. "Giant Magnetocaloric Effect in Manganites." Acta Physica Polonica A 117, no. 1 (January 2010): 203–6. http://dx.doi.org/10.12693/aphyspola.117.203.

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49

Falkowski, M., T. Toliński, and A. Kowalczyk. "Magnetocaloric Effect in NdNi4Si Compound." Acta Physica Polonica A 121, no. 5-6 (May 2012): 1290–92. http://dx.doi.org/10.12693/aphyspola.121.1290.

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50

Midya, A., P. Mandal, S. Das, S. Banerjee, L. S. Sharath Chandra, V. Ganesan, and S. Roy Barman. "Magnetocaloric effect in HoMnO3 crystal." Applied Physics Letters 96, no. 14 (April 5, 2010): 142514. http://dx.doi.org/10.1063/1.3386541.

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