首页|Direct and inverse magnetocaloric effects in FeRh alloy
Direct and inverse magnetocaloric effects in FeRh alloy
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NSTL
Elsevier
? 2022There are two types of magnetocaloric effects that are the so-called direct and inverse effects originating from ferromagnetic–paramagnetic (FM–PM) and antiferromagnetic–ferromagnetic (AFM–FM) phase transitions, respectively. Here, the magnetocaloric effects of FeRh alloy, which exhibit both the direct and inverse effects, have been studied by combining first-principles calculations and Monte Carlo simulations. The magnetic exchange coupling constants in the AFM and FM phases are evaluated by first-principles calculations based on the Liechtenstein formula. The Monte Carlo calculations considering the two-phase mixtures of AFM and FM well reproduce the experimental magnetization curves at zero external magnetic field. It is also shown that the isothermal magnetic entropy changes near the AFM–FM transition temperature under magnetic fields are successfully reproduced based on the Maxwell relation. The entropy changes in a wide range of the magnetic fields near the AFM–FM and FM–PM transition temperatures are investigated and the direct and inverse magnetocaloric effects of FeRh are discussed. The giant relative cooling power of FeRh alloy is achieved due to the large saturation magnetizations and the first-order AFM–FM phase transition.
DFTMagnetocaloric effectMonte Carlo simulations
Tran H.B.、Momida H.、Oguchi T.、Fukushima T.、Sato K.、Makino Y.
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Institute of Scientific and Industrial Research Osaka University
Institute for Solid State Physics The University of Tokyo
Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University
NSTL
Elsevier
