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Magnetic Exchange-Coupled Sm(Co,R)/Cr (R = Al, Si, Ti, Nb, Cu) Series Films for Ultrahigh-Density Longitudinal Recording Media |
| WANG Xiang1,2;LI Zuo-Yi2;LI Zhen2;CAI Chang-Bo2;HUANG Zhi-Xin2;LIAO Hong-Wei2;WANG Hao-Min2;LIN Geng-Qi2 |
| 1Institute of Microelectronics, Peking University, Beijing 100871
2Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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WANG Xiang, LI Zuo-Yi, LI Zhen et al 2003 Chin. Phys. Lett. 20 281-283 |
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Abstract SmCoR (R=Al,Si,Ti,Nb,Cu)/Cr series films were fabricated as one kind of promising materials for the ultrahigh density longitudinal magnetic recording media. The Sm(Co,Al,Si)/Cr thin films with coercivity up to 2.36 kOe, squareness ratio S near 0.94 and coercive squareness ratio S* about 0.9 were obtained. The Cr interlayer caused magnetic decoupling in Sm(Co,Al,Si)/Cr/Sm(Co,Al,Si) thin films. High coercivity of 3400--3840\,Oe and extremely fine grain size of 5-8 nm for the magnetic layer were examined. Using different substrate bias among the Sm(Co,Al,Si)(deposited with substrate bias of -150 V)/Sm(Co,Al,Si)(deposited with no substrate bias)/Sm(Co,Al,Si)(deposited with substrate bias of -150 V), the multilayer exhibited high coercivity of 2960 Oe and S* of 0.96. Sm(Co,Al,Si)/Sm(Co,Ti,Cu)/Sm(Co,Nb,Cu) trilayer improved matching between the magnetic layer and the Cr underlayer, and led to increasing in-plane anisotropy, high coercivity of 3280 Oe and S* of 0.92. Lattice matching of SmCoR {1121} and Cr {110}, etc. were found under various conditions. The microstructures of these four kinds of medium were also examined. The results suggest that it is possible to produce Sm (Co,Al,Si,Ti,Nb,Cu) multi-layer media with the combined magnetic properties required for the ultrahigh density magnetic recording.
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| Keywords:
73.21.Ac
75.50.Ss
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Published: 01 February 2003
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