面外磁化外延层中声表面波对极化率的强烈降低
Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer
摘要：
逆磁致伸缩是在施加应力/应变时可以改变磁化的效应。应变调制可以通过激励叉指式换能器以产生表面声波（SAW）来电创建。因此，SAW出现作为一个可能的路线走向感应自由波动磁数据操纵。在这里，我们证明了实验上的平面外磁致伸缩层的矫顽场的减少高达60 $\%$的SAW，超过毫米的距离。一个简单的模型表明，这种壮观的效果可以部分地解释由SAW的应变相关的域成核能的周期性降低。这一概念的证明是在（Ga，Mn）（As，P）上完成的，这是一种磁性半导体，其中面外磁各向异性可以通过外延生长变得非常弱;它应该指导全声学磁化切换的材料工程。
英文摘要：
Inverse magnetostriction is the effect by which magnetization can be changed upon application of stress/strain. A strain modulation may be created electrically by exciting interdigitated transducers to generate surface acoustic waves (SAWs). Hence SAWs appear as a possible route towards induction-free undulatory magnetic data manipulation. Here we demonstrate experimentally on an out-of-plane magnetostrictive layer a reduction of the coercive field of up to 60$\%$ by a SAW, over millimetric distances. A simple model shows that this spectacular effect can be partly explained by the periodic lowering of the strain-dependent domain nucleation energy by the SAW. This proof of concept was done on (Ga,Mn)(As,P), a magnetic semiconductor in which the out-of-plane magnetic anisotropy can be made very weak by epitaxial growth; it should guide material engineering for all-acoustic magnetization switching.
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