论文标题
金属抗铁磁铁中的光学触发应变驱动的néel矢量操纵
Optically-triggered strain-driven Néel vector manipulation in a metallic antiferromagnet
论文作者
论文摘要
缺少静脉场，对外部磁场的不敏感和超快动力学使反铁磁铁有望成为旋转器件中主动元素的候选者。在这里，我们通过结合应变和飞秒激光激发，证明了金属共线抗磁铁Mn $ _2 $ au中NéelVector的操纵。沿两个平面易于轴中的任何一个施加拉伸应变，并通过一秒钟的脉冲局部在局部刺激样品，我们沿着由施加的应变控制的方向对准néel载体。对激光量和应变的依赖性表明，对齐是由光学触发的90 $^{\ mathrm {o}} $域壁及其在自由能梯度方向滑动的结果，由磁弹性弹性燃料构成。所得的可切换状态在室温下是稳定的，对磁场不敏感。这种方法可以提供在Picsecond范围内开关时间尺度，实现强大的高密度存储器设备的方法。
The absence of stray fields, their insensitivity to external magnetic fields, and ultrafast dynamics make antiferromagnets promising candidates for active elements in spintronic devices. Here, we demonstrate manipulation of the Néel vector in the metallic collinear antiferromagnet Mn$_2$Au by combining strain and femtosecond laser excitation. Applying tensile strain along either of the two in-plane easy axes and locally exciting the sample by a train of femtosecond pulses, we align the Néel vector along the direction controlled by the applied strain. The dependence on the laser fluence and strain suggests the alignment is a result of optically-triggered depinning of 90$^{\mathrm{o}}$ domain walls and their sliding in the direction of the free energy gradient, governed by the magneto-elastic coupling. The resulting, switchable, state is stable at room temperature and insensitive to magnetic fields. Such an approach may provide ways to realize robust high-density memory device with switching timescales in the picosecond range.
