论文标题
电流诱导的磁性异质结构中的垂直有效磁场
Current-induced perpendicular effective magnetic field in magnetic heterostructures
论文作者
论文摘要
垂直有效磁场或垂直自旋（σZ）的产生对于开发节能，可扩展性和外部磁场的无磁性自旋记忆和计算技术至关重要。在这里，我们报告了一个明显的有效垂直磁场的第一个识别和深远的影响，该磁场可能是由于磁性微弹力和霍尔杆内的不对称电流传播而产生的。这个有效的垂直磁场可以表现出文献中广泛假定的所有三个特征，以“表示”σz流的存在，即均匀的垂直磁化的均匀磁性磁化，sin2dectient sin2dection的均匀磁性依赖于旋转效能的趋势依赖于sin2 ϕ的均匀磁场的均无作用（in-plomagnive sin2 sin2 sin2 sin2 sin2 sin2）在平面内磁化的第二个谐波霍尔电压中，当前和ϕ无依赖的田间贡献表明，在各种自旋极化和旋转轨道的分析中包括电流的扩散效应和磁性异性范围内的磁性范围，这是在各种旋转极化和旋转轨道上的分析。以及内存和计算技术中的外部磁性磁化切换。
Generation of perpendicular effective magnetic field or perpendicular spins (σz) is central for the development of energy-efficient, scalable, and external-magnetic-field-free spintronic memory and computing technologies. Here, we report the first identification and the profound impacts of a significant effective perpendicular magnetic field that can arise from asymmetric current spreading within magnetic microstrips and Hall bars. This effective perpendicular magnetic field can exhibit all the three characteristics that have been widely assumed in the literature to "signify" the presence of a flow of σz, i.e., external-magnetic-field-free current switching of uniform perpendicular magnetization, a sin2ϕ-dependent contribution in spin-torque ferromagnetic resonance signal of in-plane magnetization (ϕ is the angle of the external magnetic field with respect to the current, and a ϕ-independent but field-dependent contribution in the second harmonic Hall voltage of in-plane magnetization. This finding suggests that it is critical to include current spreading effects in the analyses of various spin polarizations and spin-orbit torques in magnetic heterostructure. Technologically, our results provide perpendicular effective magnetic field induced by asymmetric current spreading as a novel, universally accessible mechanism for efficient, scalable, and external-magnetic-field-free magnetization switching in memory and computing technologies.
