CoFeB/MgO/CoFeBトンネル接合におけるスピン注入磁化反転に対する困難軸方向磁場の影響(スピンエレクトロニクス)

概要

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The dependence of critical current density (J_c) for current-induced magnetization switching (CIMS) on external magnetic fields applied along the hard axis of a free layer (H_<hard>) was investigated in CoFeB/MgO/CoFeB magnetic tunnel junctions. The J_c and the intrinsic current density (J_<c0>), which is derived from the dependence of J_c on pulse duration. decreased as lH_<hard>| increased. As the reduction ratios of J_<c0> while applying H_<Hard> depend on the anisotropy field of junctions (H_k), the initial angle of magnetization, affected by H_<hard> and H_k, is related to the reduction in J_<c0>. These results are discussed in terms of the energy barrier for CIMS and the spin transfer efficiency.
社団法人日本磁気学会の論文
2007-03-01