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arXiv 1104.2483cond-mat.mes-hall
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纳米磁体中的电流诱导涡旋超晶格

Current induced vortex superlattices in nanomagnets

Oleksii M. Volkov, Volodymyr P. Kravchuk, Denis D. Sheka, Yuri Gaididei

摘要:

利用Slonczewski-Berger机制数值研究了自旋转移力矩对涡旋态磁性纳米盘的影响。对于同向电流、自旋极化和涡旋极性的情况,确定了临界电流的存在。临界电流区分了两种状态:(i)变形但静止的涡旋状态和(ii)基本上动态的时空周期结构。该结构是一个稳定的涡旋-反涡旋晶格。晶格的对称性取决于所施加的电流值,并且对于高电流(接近饱和),仅观察到正方形晶格。稳定格的大小的一般关系得到解析。

英文摘要:

Influence of the spin-transfer torque on the vortex state magnetic nanodisk is studied numerically via Slonczewski-Berger mechanism. The existence of a critical current is determined for the case of same-directed electrical current, its spin polarization and polarity of the vortex. The critical current separates two regimes: (i) deformed but static vortex state and (ii) essentially dynamic state under which the spatio-temporal periodic structures can appear. The structure is a stable vortex-antivortex lattice. Symmetry of the lattice depends on the applied current value and for high currents (close to saturation) only square lattices are observed. General relations for sizes of the stable lattice is obtained analytically.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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