Improvement of Magnetoresistive Character of NiO/NiFeCo/Cu/NiFeCo Exchange-Biased Spin-Valves Through Annealing in Magnetic Field
LU Zhi-hong1, LI Tie2, QIU Jin-jun3, XUN Kun1, SHEN Hong-lie2,
LI Zuo-yi3, SHEN De-fang1
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
Improvement of Magnetoresistive Character of NiO/NiFeCo/Cu/NiFeCo Exchange-Biased Spin-Valves Through Annealing in Magnetic Field
LU Zhi-hong1;LI Tie2;QIU Jin-jun3;XUN Kun1;SHEN Hong-lie2,
LI Zuo-yi3;SHEN De-fang1
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
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.
(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
引用本文:
LU Zhi-hong;LI Tie;QIU Jin-jun;XUN Kun;SHEN Hong-lie;
LI Zuo-yi;SHEN De-fang
. Improvement of Magnetoresistive Character of NiO/NiFeCo/Cu/NiFeCo Exchange-Biased Spin-Valves Through Annealing in Magnetic Field
[J]. 中国物理快报, 1999, 16(1): 65-67.
LU Zhi-hong, LI Tie, QIU Jin-jun, XUN Kun, SHEN Hong-lie,
LI Zuo-yi, SHEN De-fang
. Improvement of Magnetoresistive Character of NiO/NiFeCo/Cu/NiFeCo Exchange-Biased Spin-Valves Through Annealing in Magnetic Field
. Chin. Phys. Lett., 1999, 16(1): 65-67.
1999, Vol. 16 
