论文标题
抗fiferromagnet的无现场旋转轨道扭矩转换带有垂直的néel载体
Field-free spin-orbit torque switching of an antiferromagnet with perpendicular Néel vector
论文作者
论文摘要
无场自旋轨道扭矩引起的垂直磁化的180°重新定向对高性能磁记忆有益。抗铁磁材料（AFM）可以提供比铁磁对应物更高的运行速度。在本文中，我们建议将三层AFM/绝缘子/重金属结构作为AFM存储器。我们表明，通过使用两种正交电流，可以分别提供均匀的阻尼状扭矩和类似磁场的扭矩，可以实现AFM对AFM的无场切换。可逆切换可以通过逆转任何一个电流来获得。 1.79 10^11A/m^2的电流密度足以诱导切换。此外，在开关期间，这两个磁矩变为非共线。这使得超快切换在40个picseconds之内。这项工作中提出的设备和开关机制提供了一种有前途的方法，可以确定用垂直的néel矢量切换AFM。它还可以刺激基于AFM的MRAM的发展。
The field-free spin-orbit torque induced 180° reorientation of perpendicular magnetization is beneficial for the high performance magnetic memory. The antiferromagnetic material (AFM) can provide higher operation speed than the ferromagnetic counterpart. In this paper, we propose a trilayer AFM/Insulator/Heavy Metal structure as the AFM memory device. We show that the field-free switching of the AFM with perpendicular Néel vector can be achieved by using two orthogonal currents, which provide the uniform damping-like torque and stagger field-like torque, respectively. The reversible switching can be obtained by reversing either current. A current density of 1.79 10^11A/m^2 is sufficient to induce the switching. In addition, the two magnetic moments become noncollinear during the switching. This enables an ultrafast switching within 40 picoseconds. The device and switching mechanism proposed in this work offer a promising approach to deterministically switch the AFM with perpendicular Néel vector. It can also stimulate the development of ultrafast AFM-based MRAM.
