Giant Magnetoresistance in Bulk, Liquid-quenched Ribbon and Film Granular Alloys
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概要
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Magnetoresistance has been investigated for bulk, liquid-quenched ribbon and film noble metal(NM)-rich granular alloys. Solid solutions were obtained in the water- , liquid- and vapor-quenched state and nano-structured magnetic precipitates in NM-rich matrix were evolved by subsequent heat treatments. After aging, the giant magnetoresistance (GMR) is observed in these bulk, liquid quenched ribbon and film granular alloys. In particular, the room temperature value of Magnetoresistance (MR) ratio of 5 % in the Co_<15>Au_<85> bulk granular alloy aged at 300 ℃ for 1 h is larger than that reported in Co/Au multilayers. The Co_<15>Cu_<85> alloy ribbons aged at 500 ℃ for 90 min exhibits the MR ratio as large as 6.3 % at room temperature in a field of 15 kOe. Small amounts of Ni improve the MR ratio. Especially, the Co_<15>Ni_5Cu_<85> alloy ribbons aged at 500 ℃ for 60 min exhibits the ratio of 7.6 % larger than the value of the aged Co_<15>Cu_<85> ribbon. Furthermore, the anisotropy in GMR in bulk Fe_5Ni_<15>Cu_<80> alloy aged at 500 ℃ for 170 min is obtained by compression.giant magnetoresistancenanogranularprecipitationsupersaturated solid solutionquenching
- 東北大学の論文
- 1994-03-25
著者
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Takeda H
Tohoku Univ. Jpn
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Kataoka N
Department Of Materials Science Faculty Of Engineering Tohoku University
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Kataoka Noriyuki
Department Of Material Science And Technology Kyoto University
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Fukamichi Kazuaki
Department Of Aterials Science Graduate School Of Engineering Tohoku University
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Takeda Hideki
Department Of Electrical Engineering Faculty Of Science And Technology Keio University
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Kim I
Tohoku Univ. Sendai Jpn
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Kim Ick
Department Of Materials Science Faculty Of Engineering Tohoku University:(present Address)high-perfo
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Takeda Hideki
Department Of Chemistry And Materials Technology Kyoto Institute Of Technology
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