Magnetocaloric effect of field-induced ferromagnet BaFeO3

Journal of Applied Physics - Tập 114 Số 7 - 2013
Masaichiro Mizumaki1,2, Kenji Yoshii3, Naoaki Hayashi4, Takashi Saito5,1, Yuichi Shimakawa5,1, Mikio Takano6
1Japan Science and Technology Agency, CREST 2 , 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
2Japan Synchrotron Radiation Research Institute 1 , Sayo, Hyogo 679-5198, Japan
3Japan Atomic Energy Agency, Sayo 3 , Hyogo 679-5148, Japan
4Micro/Nano Fabrication Hub, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University 4 , Yoshida-Honmachi, Sakyo, Kyoto 606-8501, Japan
5Institute for Chemical Research, Kyoto University 5 , Gokasho, Uji, Kyoto 611-0011, Japan
6Institute for Integrated Cell-Material Sciences Kyoto University 6 , Kyoto 606-8501, Japan

Tóm tắt

We have investigated the magnetocaloric effect (MCE) of a perovskite oxide, BaFeO3, that shows ferromagnetism by the aid of a small external field of ∼3 kOe (3.5 μB/Fe, TC = 111 K). The magnetization is found to change almost reversibly in both field and temperature cycles. Hence, magnetic and thermal hysteretic losses are negligibly low during refrigeration, a property that is suitable for application. The reversible MCE is likely to arise from the absence of an orbital magnetic moment of Fe ions which are essentially in the Fe3+L state (L: ligand hole). The magnetic entropy change and refrigerant capacity near the TC are ∼5.8 J kg−1 K−1 and ∼172 J kg−1, respectively, both of which are comparable to those of ferromagnetic perovskite manganites. As BaFeO3 contains no rare metals and is stable against corrosion, the material can be regarded as a candidate refrigerant material.

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Journal of Applied Physics

Tập 114 Số 7

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