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The exchange-coupled hard/soft magnetic material, proposed in 1991 by Kneller et al.[1], is widely regarded as an excellent next-generation permanent magnetic material. A perfect composite material is expected to hold a large energy product because of the combination of the large remanence of the soft phase and the high coercivity of the hard phase. A giant energy product as high as 120 MG Oe was...
MnGa compounds possess several fascinating and useful properties, such as a large magnetocrys-talline anisotropy Ku, a high spin polarization P, a high Curie temperature TC and a flexible magnetization M. These results suggest that MnGa compounds are of potential candidates for spin-transfer-torque and rare-earth-free permanent magnet applications [1-2]. There are two most interesting tetragonal phases,...
Exchange-coupled PtFe/Fe composite films have been prepared with as spacer layer and buffer layer. The coercivity generally decreases with increasing thickness of the Fe layer at fixed thickness of the spacer layer. At fixed thickness of Fe the layer, the coercivity shows a maximum and then declines with increasing thickness of the ...
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