电流和场驱动的磁性反凹
Current- and field-driven magnetic antivortices
摘要：
铁磁薄膜元件中的反涡旋是具有垂直于平面指向的芯的平面内磁化配置。通过微磁学模拟，我们发现在交变磁场或自旋极化电流的激励下，磁反涡在椭圆轨道上类似于磁涡旋地旋转。研究了高频激励与反涡旋转之间的相位关系。在由自旋极化电流激发的情况下，相位由反涡旋的极化确定，而对于由磁场激发，相位取决于极化以及面内磁化。电流和磁场的同时激励可以导致磁芯回转幅度的最大增强或完全抑制，这取决于激励和面内磁化之间的角度。振幅的这种变化可以用于在实验上区分反涡旋芯的自旋扭矩和奥斯特场驱动运动。
英文摘要：
Antivortices in ferromagnetic thin-film elements are in-plane magnetization configurations with a core pointing perpendicular to the plane. By using micromagnetic simulations, we find that magnetic antivortices gyrate on elliptical orbits similar to magnetic vortices when they are excited by alternating magnetic fields or by spin-polarized currents. The phase between high-frequency excitation and antivortex gyration is investigated. In case of excitation by spin-polarized currents the phase is determined by the polarization of the antivortex, while for excitation by magnetic fields the phase depends on the polarization as well as on the in-plane magnetization. Simultaneous excitation by a current and a magnetic field can lead to a maximum enhancement or to an entire suppression of the amplitude of the core gyration, depending on the angle between excitation and in-plane magnetization. This variation of the amplitude can be used to experimentally distinguish between spin-torque and Oersted-field driven motion of an antivortex core.
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