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    • 3. 发明专利
    • Magnetic material
    • JP4352023B2
    • 2009-10-28
    • JP2005157417
    • 2005-05-30
    • 株式会社東芝
    • 政司 佐橋忠彦 小林明子 斉藤孝雄 沢
    • C22C22/00H01F1/00C22C38/00
    • PROBLEM TO BE SOLVED: To provide a magnetic material capable of realizing magnetic refrigeration using a comparatively low magnetic field made by permanent magnet in an ordinary temperature region. SOLUTION: A magnetic material has a flexion point at which a twice differential coefficient to the magnetic field of a magnetization curve changes to negative from positive within the limit of the magnetic field made by permanent magnet in some temperature region, preferably in the part of the temperature region of 200K or more and 350K or less. According to the magnetic material, low temperature is can be generated using a comparatively low magnetic field by allowing an electronic magnetism spin system and a trellis system to mutually carry out the transfer of entropy at temperatures near a temperature at which the flexion point arises in the magnetization curve. The magnetic material compatible to the above condition includes, for example, La (Fe, Si) 13 , (Hf, Ta)Fe 2 , (Ti, Sc)Fe 2 , and (Nb, Mo)Fe 2 containing equal to or more than 50-60 atom% transition metal such as Fe. COPYRIGHT: (C)2006,JPO&NCIPI