A transmission electron microscope study of Néel skyrmion magnetic textures in multilayer thin film systems with large interfacial chiral interaction.
A transmission electron microscope study of Néel skyrmion magnetic textures in multilayer thin film systems with large interfacial chiral interaction.
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DOI：
10.1038/s41598-018-23799-0
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发表时间：
2018-04-09
影响因子：
4.6
通讯作者：
Marrows CH
中科院分区：
文献类型：
--
作者：
McVitie S;Hughes S;Fallon K;McFadzean S;McGrouther D;Krajnak M;Legrand W;Maccariello D;Collin S;Garcia K;Reyren N;Cros V;Fert A;Zeissler K;Marrows CH
超薄铁磁金属(FM)/重金属(HM)多层膜系统中的Skyrmions由于在自旋电子学领域的应用，近年来引起了人们的极大兴趣。具有两个正确选择的重金属层的三明治结构提供了附加的界面交换相互作用，从而促进了具有Néel特征和固定手性的磁区壁或Skyrmion自旋织构。洛伦兹透射电子显微镜是一种高分辨率的方法，非常适合对这种手性磁性构型进行定量成像。结合平面和横截面样品的物理和化学电子显微镜分析，已经识别和测量了关键的长度尺度，如颗粒尺寸和磁化变化的手征变化。我们提供的数据显示了从直接成像测量的颗粒尺寸(主要是 <； 10 nm)的重要性，以及它在描述孤立的Skyrmions(直径为 <； 100 nm)的观察行为方面的潜在作用。在后者中，测得磁化强度旋转的区域约为30 nm。这种关于系统中多尺度磁化变化的定量信息对于理解和利用天子的行为在未来信息存储和逻辑设备中的应用是关键。
Skyrmions in ultrathin ferromagnetic metal (FM)/heavy metal (HM) multilayer systems produced by conventional sputtering methods have recently generated huge interest due to their applications in the field of spintronics. The sandwich structure with two correctly-chosen heavy metal layers provides an additive interfacial exchange interaction which promotes domain wall or skyrmion spin textures that are Néel in character and with a fixed chirality. Lorentz transmission electron microscopy (TEM) is a high resolution method ideally suited to quantitatively image such chiral magnetic configurations. When allied with physical and chemical TEM analysis of both planar and cross-sectional samples, key length scales such as grain size and the chiral variation of the magnetisation variation have been identified and measured. We present data showing the importance of the grain size (mostly < 10 nm) measured from direct imaging and its potential role in describing observed behaviour of isolated skyrmions (diameter < 100 nm). In the latter the region in which the magnetization rotates is measured to be around 30 nm. Such quantitative information on the multiscale magnetisation variations in the system is key to understanding and exploiting the behaviour of skyrmions for future applications in information storage and logic devices.
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影响因子：
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