arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.00367cond-mat.mtrl-sci
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局部磁场梯度对个体skyrmion的操纵

Individual skyrmion manipulation by local magnetic field gradients

Arianna Casiraghi, Héctor Corte-León, Mehran Vafaee, Felipe Garcia-Sanchez, Gianfranco Durin, Massimo Pasquale, Gerhard Jakob, Mathias Kläui, Olga Kazakova

摘要:

磁性skyrmions是拓扑保护的自旋纹理,在具有强Dzyaloshinskiii-Moriya相互作用的系统中稳定。一些研究表明,电流可以通过自旋轨道力矩有效地移动skyrmions。虽然有希望的技术应用,电流驱动的skyrmion运动本质上是集体的,并伴随着不希望的加热效应。在这里,我们展示了一种新的方法来控制个人skyrmion的位置精确,这依赖于样品和磁力显微镜(MFM)探针之间的磁相互作用。我们调查垂直磁化的X/CoFeB/MgO多层膜,其中X = W或Pt的磁是足够强的,以允许skyrmion成核在施加的字段。我们表明,这些skyrmions可以单独操作,通过扫描MFM探头产生的局部场梯度,具有前所未有的精度。此外,我们表明,探测杂散场可以帮助skyrmion成核。我们的概念验证结果提供了电流自由的范例,以有效的个人skyrmion控制。

英文摘要:

Magnetic skyrmions are topologically protected spin textures, stabilised in systems with strong Dzyaloshinskii-Moriya interaction (DMI). Several studies have shown that electrical currents can move skyrmions efficiently through spin-orbit torques. While promising for technological applications, current-driven skyrmion motion is intrinsically collective and accompanied by undesired heating effects. Here we demonstrate a new approach to control individual skyrmion positions precisely, which relies on the magnetic interaction between sample and a magnetic force microscopy (MFM) probe. We investigate perpendicularly magnetised X/CoFeB/MgO multilayers, where for X = W or Pt the DMI is sufficiently strong to allow for skyrmion nucleation in an applied field. We show that these skyrmions can be manipulated individually through the local field gradient generated by the scanning MFM probe with an unprecedented level of accuracy. Furthermore, we show that the probe stray field can assist skyrmion nucleation. Our proof-of-concepts results offer current-free paradigms to efficient individual skyrmion control.

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