| Original Articles |
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Improvement of Magnetoresistive Character of NiO/NiFeCo/Cu/NiFeCo Exchange-Biased Spin-Valves Through Annealing in Magnetic Field
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| LU Zhi-hong1;LI Tie2;QIU Jin-jun3;XUN Kun1;SHEN Hong-lie2,
LI Zuo-yi3;SHEN De-fang1
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| 1Optic Disc and Magnetic Material Laboratory,
2functional Material Laboratory, Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050
3Department of Solid State Electronics, Huazhong University of Science and Technology, Wuhan 430074
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| Cite this article: |
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LU Zhi-hong, LI Tie, QIU Jin-jun et al 1999 Chin. Phys. Lett. 16 65-67 |
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Abstract NiO(70 nm)/NiFeCo(5 nm)/Cu(2 nm)/NiFeCo(5 nm) spin-valve multilayers were prepared by electron beam evaporation. It is found that the magnetoresistive (MR) ratio of the as-deposited films is relatively small (about 1.6% ) and there is no apparent biasing in MR curves of as-deposited multilayers due to weak exchange coupling. Through heat treatment at a proper temperature in a magnetic field, the exchange field of the materials increases and the multilayers show good exchange-biased spin-valve MR character with MR value reaching about 2.5%. The proper temperature range for annealing is 200-250oC. With further increasing temperature, MR ratio drops rapidly.
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| Keywords:
75.70.Pa
75.70.Cn
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Published: 01 January 1999
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| PACS: |
75.70.Pa
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75.70.Cn
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(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
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Abstract
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