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山本 慧; Gomonay, O.*; Sinova, J.*; Schwiete, G.*
Physical Review B, 98(1), p.014406_1 - 014406_24, 2018/07
被引用回数:1 パーセンタイル:5.02(Materials Science, Multidisciplinary)We study spin-dependent electron transport through a ferromagnetic-antiferromagnetic-normal metal tunneling junction, in the absence of spin-orbit coupling. We derive microscopic formulas for various types of spin torque acting on the antiferromagnet as well as for charge and spin currents flowing through the junction. The obtained results are applicable in the limit of slow magnetization dynamics. We identify a parameter regime in which an unconventional damping-like torque can become comparable in magnitude to the conventional Slonczewski's torque familiar from ferromagnets. Moreover, we show that the antiferromagnetic sublattice structure opens up a channel of electron transport which does not have a ferromagnetic analog and that this mechanism leads to a pronounced field-like torque. Both charge conductance and spin current transmission through the junction depend on the relative orientation of the ferromagnetic and the antiferromagnetic order parameters.
山本 慧; Gomonay, O.*; Sinova, J.*; Schwiete, G.*
no journal, ,
本研究では、強磁性体-反強磁性体-常磁性金属からなるトンネル接合を非平衡グリーン関数の方法を用いて調べ、種々のスピントルクおよび電荷とスピンの伝導度に対する微視的な公式を導出する。異なるタイプのトルクの間の大小関係とそのトンネル確率依存性を発表する。またこれらのトルクが磁化の運動に及ぼす影響も議論する。さらに電荷とスピンの透過率が強磁性体と反強磁性体の秩序変数の間の角に依存することを示し、その応用可能性について議論する。