Antiferromagnetic Skyrmions

反铁磁斯格明子

基本信息

批准号：
17K05511
负责人：
Tretiakov Oleg
金额：
$ 2.83万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2017
资助国家：
日本
起止时间：
2017-04-01 至 2019-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K05511/
关键词：
Antiferromagnets Skyrmions antiferromagnets

项目摘要

We demonstrated that the nontrivial magnetic texture of antiferromagnetic Skyrmions promotes a nonvanishing topological spin Hall effect on the flowing electrons. This effect results in a substantial enhancement of the nonadiabatic torque and, hence, improves the Skyrmion mobility [Phys. Rev. Lett. 121, 097204 (2018)]. Furthermore, we identified the dynamics of the antiferromagnetic skyrmion induced by a magnetic anisotropy gradient [Phys. Rev. B 98, 134448 (2018)]. We also showed that skyrmion-based spin torque nano-oscillators are potential next-generation microwave signal generators. We proposed to use the circular motion of an antiferromagnetic skyrmion to create an oscillation signal to overcome this obstacle. Furthermore, the speed of the circular motion for an antiferromagnetic skyrmion in a nanodisk was analytically derived and agreed well with simulations [Appl. Phys. Lett. 114, 042402 (2019)].Micromagnetic simulations for skyrmions and domain walls in the system with Dzyaloshinskii-Moriya interaction were performed and an analytical theory for domain wall motion resulted in Phys. Rev. B 99, 060407(R) (2019). We studied the structure and dynamics of magnetic domains in synthetic antiferromagnets based on Co/Ru/Co films. We have shown that dramatic effects arise from the interaction among the topological defects comprising the dual domain walls in these structures. These features allowed us to work on the enhanced control of domain-wall motion in synthetic antiferromagnets with the potential for future devices [Sci. Rep. 8, 15794 (2018)].

我们证明了反铁磁斯格明子的非平凡磁性结构促进了流动电子的非零拓扑自旋霍尔效应。这种效应导致非绝热扭矩的显着增强，从而提高了斯格明子的迁移率 [Phys.莱特牧师。 121, 097204 (2018)]。此外，我们还确定了磁各向异性梯度诱导的反铁磁斯格明子的动力学[Phys.修订版 B 98, 134448 (2018)]。我们还表明，基于斯格明子的自旋扭矩纳米振荡器是潜在的下一代微波信号发生器。我们建议利用反铁磁斯格明子的圆周运动来产生振荡信号来克服这一障碍。此外，通过分析推导了纳米盘中反铁磁斯格明子的圆周运动速度，并且与模拟结果吻合良好[Appl。物理。莱特。 114, 042402 (2019)]。对具有 Dzyaloshinskii-Moriya 相互作用的系统中的斯格明子和畴壁进行了微磁模拟，并得出了畴壁运动的分析理论。修订版 B 99, 060407(R) (2019)。我们研究了基于 Co/Ru/Co 薄膜的合成反铁磁体的磁畴结构和动力学。我们已经证明，这些结构中构成双畴壁的拓扑缺陷之间的相互作用会产生显着的效应。这些功能使我们能够致力于增强对合成反铁磁体中畴壁运动的控制，并具有未来设备的潜力 [Sci.报告 8, 15794 (2018)]。