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Magnetic refrigeration with GdN by Active Magnetic Refrigerator cycle

Published online by Cambridge University Press:  23 March 2011

Yusuke Hirayama
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Hiroyuki Okada
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Takashi Nakagawa
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Takao. A. Yamamoto
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Takafumi Kusunose
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
Numazawa Takenori
Exploratory Materials Research Laboratories for Energy and Environment, National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
Koichi Mastumoto
Department of Physics, Kanazawa University, Kanazawa 920-1192, Japan
Toshio Irie
SANTOKU corporation, Kobe, Hyogo 674-0093, Japan
Eiji Nakamura
SANTOKU corporation, Kobe, Hyogo 674-0093, Japan
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A magnetic refrigeration test was performed using a test device filled with spherical GdN material synthesized by the hot isostatic pressing (HIP) method. Refrigeration with an active magnetic regenerator cycle was tested in the temperature range between 48 and 66 K, with the field changing from 1.2 to 3.7 T and 2.0 to 4.0 T at upper and lower sides of the regenerator bed filled with the GdN spheres, respectively. Temperature spans about of 2 K were obtained at both sides, and the total temperature span in each cycle attained about 5 K. The specific heat of the material was measured to calculate the magnetic entropy change ΔS and the adiabatic temperature change ΔT induced by the magnetic field change ΔH. It was suggested that for a given ΔH, larger ΔS and ΔT can be exploited when demagnetized to lower H, especially, to zero field.

Research Article
Copyright © Materials Research Society 2011

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