Tuning the Properties of Zero-Field Room Temperature Ferromagnetic Skyrmions by Interlayer Exchange Coupling
Tuning the Properties of Zero-Field Room Temperature Ferromagnetic Skyrmions by Interlayer Exchange Coupling
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DOI：
10.1021/acs.nanolett.0c00137
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发表时间：
2020-07-08
期刊：
影响因子：
10.8
通讯作者：
Wiesendanger, Roland
中科院分区：
文献类型：
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作者：
Lo Conte, Roberto;Nandy, Ashis K.;Wiesendanger, Roland
磁性材料为克服影响半导体行业的可扩展性和能耗限制提供了机会。已经提出了新的计算设备架构，诸如低功率固态磁逻辑和逻辑中存储器设备，其依赖于磁性材料的独特性质。磁skyrmions，拓扑保护准粒子，是许多新提出的自旋电子器件的核心。许多不同的材料系统已经被证明在室温下拥有铁磁skyrmions。然而，磁场是稳定skyrmions的关键成分，由于产生磁场的有源组件的可扩展性差，这对于应用来说是不期望的。在这里，我们报告的铁磁skyrmions在室温和零磁场，稳定通过层间交换耦合（IEC）之间的参考磁体和自由磁体的观察。最重要的是，通过调整IEC的强度，我们能够调整skyrmion的大小和面密度。我们的研究结果是相关的skyrmion为基础的自旋电子器件的发展，适用于一般用途的应用超越现代纳米电子学。
Magnetic materials offer an opportunity to overcome the scalability and energy consumption limits affecting the semiconductor industry. New computational device architectures, such as low-power solid state magnetic logic and memory-in-logic devices, have been proposed which rely on the unique properties of magnetic materials. Magnetic skyrmions, topologically protected quasi-particles, are at the core of many of the newly proposed spintronic devices. Many different materials systems have been shown hosting ferromagnetic skyrmions at room temperature. However, a magnetic field is a key ingredient to stabilize skyrmions, and this is not desirable for applications, due to the poor scalability of active components generating magnetic fields. Here we report the observation of ferromagnetic skyrmions at room temperature and zero magnetic field, stabilized through interlayer exchange coupling (IEC) between a reference magnet and a free magnet. Most importantly, by tuning the strength of the IEC, we are able to tune the skyrmion size and areal density. Our findings are relevant to the development of skyrmion-based spintronic devices suitable for general-use applications which go beyond modern nanoelectronics.