Difference in magnetic properties and magnetocaloric effect of FeRh0.98Al0.02 alloy with different sample sizes

•The flake sample with smaller particles of FeRh0.98Al0.02 alloy undergoes a more pronounced first-order AFM-FM transition than the chunk sample.•The flake and chunk of FeRh0.98Al0.02 alloy exhibit different AFM-FM phase transition temperature and thermal hysteresis.•The chunk FeRh0.98Al0.02 alloy d...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 535; p. 168034
Main Authors Shang, Yafen, Zhou, Xiaoyu, Li, Yanzhuo, Mozharivskyj, Yurij, Fu, Hao
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.10.2021
Elsevier BV
Subjects
Antiferromagnetism
Ferromagnetism
Flakes
Heating
Hysteresis
Magnetic entropy change
Magnetic properties
Magnetic refrigeration
Magnetism
Magnetocaloric effect
Phase transition
Phase transitions
Transition temperature
Magnetic refrigeration
Magnetic entropy change
Magnetocaloric effect
Phase transition
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Summary:•The flake sample with smaller particles of FeRh0.98Al0.02 alloy undergoes a more pronounced first-order AFM-FM transition than the chunk sample.•The flake and chunk of FeRh0.98Al0.02 alloy exhibit different AFM-FM phase transition temperature and thermal hysteresis.•The chunk FeRh0.98Al0.02 alloy displays magnetocaloric properties suitable for magnetic refrigeration near room temperature.•The chunk sample exhibits 54% larger RC value compared to flakes. Magnetic and magnetocaloric properties of the polycrystalline FeRh0.98Al0.02 alloy have been investigated as function of its physical state. A flake FeRh0.98Al0.02 sample undergoes an antiferromagnetic (AFM)-ferromagnetic (FM) phase transition around 275 K during heating and displays a 20 K thermal hysteresis upon the following cooling with an applied field of 5kOe. However, for a solid chunk sample, the transition temperature is around 308 K on heating and the hysteresis is 16 K. The maximum magnetic entropy change (ΔSM) is 3.1 and 2.7 J/kg K for μ0ΔH = 30 kOe and the refrigerant capacity (RC) is 120 and 185 J/kg for the flake and chunk samples, respectively. The temperature of the ΔSM maximum for the flake samples changes for different values of ΔH, which is characteristic for a first-order transition. On the other hand, the temperature remains almost constant for the chunk sample.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168034