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arXiv 1803.03022cond-mat.mtrl-sci
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高磁场作用下Mn $_2$ Au中反铁磁畴的直接成像

Direct imaging of antiferromagnetic domains in Mn$_2$Au manipulated by high magnetic fields

A. A. Sapozhnik, M. Filianina, S. Yu. Bodnar, A. Lamirand, M. Mawass, Y. Skourski, H. -J. Elmers, H. Zabel, M. Kläui, M. Jourdan

摘要:

在反铁磁(AFM)自旋电子学领域,有关Néel矢量,AFM畴大小和自旋翻转场的信息是器件应用的先决条件,但不容易获得。利用X射线磁线性二向色性光电子显微镜(XMLD-PEEM)研究了磁场高达70 T时Mn_2Au(001)外延薄膜中的AFM畴和自旋翻转引起的畴结构变化。所制备的Mn $_2$ Au膜表现出AFM畴,其平均尺寸为$\sim$ 1 $μ$ m。沿磁晶易磁化轴施加超过自旋翻转场的30 T磁场,显著增加了AFM畴尺寸,其中Néel矢量垂直于所施加的磁场方向。Néel型畴壁(DW)的宽度低于PEEM的空间分辨率,因此只能从DW轮廓的分析估计为小于80 nm。此外,使用DW宽度和自旋翻转场的值,我们评估了范围在1和17 $μ$ eV/f. u之间的面内各向异性常数。

英文摘要:

In the field of antiferromagnetic (AFM) spintronics, information about the Néel vector, AFM domain sizes, and spin-flop fields is a prerequisite for device applications but is not available easily. We have investigated AFM domains and spin-flop induced changes of domain patterns in Mn2Au(001) epitaxial thin films by X-ray magnetic linear dichroism photoemission electron microscopy (XMLD-PEEM) using magnetic fields up to 70 T. As-prepared Mn$_2$Au films exhibit AFM domains with an average size $\sim$ 1 $μ$m. Application of a 30T field, exceeding the spin-flop field, along a magnetocrystalline easy axis, dramatically increases the AFM domain size with Néel vectors perpendicular to the applied field direction. The width of Néel type domain walls (DW) is below the spatial resolution of the PEEM and therefore can only be estimated from an analysis of the DW profile to be smaller than 80 nm. Furthermore, using the values for the DW width and the spin-flop field, we evaluate an in-plane anisotropy constant ranging between 1 and 17 $μ$eV/f.u.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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