arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1503.05161cond-mat.mtrl-sci
收藏

具有垂直磁各向异性和Dzyaloshinskiii-Moriya相互作用的材料中自旋转移矩驱动的拓扑、非拓扑和瞬子液滴

Topological, non topological and instanton droplets driven by spin-transfer torque in materials with perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya Interaction

Mario Carpentieri, Riccardo Tomasello, Roberto Zivieri, Giovanni Finocchio

摘要:

界面的Dzyaloshinskiii-Moriya相互作用可以修改由局部自旋极化电流激发的液滴的拓扑结构。在这里,我们表明,除了与skyrmion数为1(拓扑)或零(非拓扑)的静止液滴激发,存在,对于一个固定的电流,一个非平稳的时间行为的激发模式。我们称这种模式为“瞬子液滴”,其特征在于Skyrmion数的时域跃迁。这些跃迁耦合到非相干自旋波的发射,可以在频域中观察到作为噪声源。我们的研究结果是有趣的,从一个基本的角度来看,研究自旋波发射由于在电流驱动系统的拓扑结构的转变,并可能打开路线的实验基础上的磁阻效应的设计下一代的纳米微波振荡器。

英文摘要:

The interfacial Dzyaloshinskii-Moriya Interaction can modify the topology of droplets excited by a localized spin-polarized current. Here, we show that, in addition to the stationary droplet excitations with skyrmion number either one (topological) or zero (non-topological), there exists, for a fixed current, an excited mode with a non-stationary time behavior. We call this mode "instanton droplet", which is characterized by time domain transitions of the skyrmion number. These transitions are coupled to an emission of incoherent spin-waves that can be observed in the frequency domain as a source of noise. Our results are interesting from a fundamental point of view to study spin-wave emissions due to a topological transition in current-driven systems, and could open the route for experiments based on magnetoresistance effect for the design of a further generation of nanoscale microwave oscillators.

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。

↑