Penthorn N E, Hao X, Wang Z, Huai Y, Jiang H W
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Avalanche Technology, Fremont, California 95438, USA.
Phys Rev Lett. 2019 Jun 28;122(25):257201. doi: 10.1103/PhysRevLett.122.257201.
We have deterministically created a stable topological spin texture in magnetic tunnel junctions (MTJ) by using pulsed or microwave currents. The spin texture is characterized by a field-dependent intermediate resistance state and a new magnetic resonance. Micromagnetic simulations show that the observations are consistent with the nucleation of a single skyrmion, facilitated by a spatially nonuniform stray field. The unique resonance spectrum is identified as the skyrmion breathing mode and a skyrmion diameter of 75 nm is estimated. This work shows the possibility to create skyrmions in MTJs without the Dzyaloshinskii-Moriya interaction and could lead to noninvasive, on-chip skyrmion measurement.
我们通过使用脉冲电流或微波电流，在磁隧道结（MTJ）中确定性地创建了一种稳定的拓扑自旋纹理。这种自旋纹理的特征在于与场相关的中间电阻状态和一种新的磁共振现象。微磁模拟表明，这些观测结果与单个斯格明子的成核过程一致，该过程由空间不均匀的杂散场促成。独特的共振光谱被确定为斯格明子呼吸模式，并估计出斯格明子直径为75纳米。这项工作展示了在没有Dzyaloshinskii-Moriya相互作用的情况下在MTJ中创建斯格明子的可能性，并可能导致非侵入性的片上斯格明子测量。
