Rapid Kerr imaging characterization of the magnetic properties of two-dimensional ferromagnetic Fe3GeTe2
Rapid Kerr imaging characterization of the magnetic properties of two-dimensional ferromagnetic Fe3GeTe2
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二维铁磁 Fe3GeTe2 磁性的快速克尔成像表征
DOI：
10.1063/5.0030607
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发表时间：
2020-11-09
影响因子：
4
通讯作者：
Jiang, Wanjun
中科院分区：
文献类型：
--
作者：
Cai, Li;Yu, Chenglin;Jiang, Wanjun
货车瓦（vdW）铁磁材料在纳米材料界引起了相当大的关注，它可以提供一个独特的平台来研究纳米尺度下的磁性。沿着这一方向，人们报道了许多有趣的结果，包括电场对磁性的控制和拓扑自旋织构。在这份报告中，我们提出了一种快速和空间分辨成像方法来研究Fe 3GeTe 2（FGT）纳米片的尺寸依赖的磁性。我们的方法被命名为极性磁光克尔成像显微术（p-MIMM），这是通过分析的强度演变的宽场极性磁光克尔效应（MOKE）的图像，通过不同的磁场，厚度和温度收集。特别地，可以在FGT纳米片中以亚微米分辨率获得空间分辨的MOKE磁滞回线。通过分析相对（饱和）MOKE强度作为温度的函数的演化，我们进一步研究了临界指数和普适类及其对FGT纳米片厚度的依赖性。结合极性MOKE图像与计算的MOKE磁滞回线，详细的磁相图总结的条纹域，单域，顺磁状态的演变进一步验证。我们的研究结果表明，宽场p-MIMM可以方便地用于快速检测多功能VDW磁性材料的磁性能。
Van der Waals (vdW) ferromagnetic materials have attracted considerable attention in the nanomaterial community, which could provide a unique platform to study magnetism at the nanoscale. Along this direction, many interesting results have been reported, including the electric field control of magnetism and topological spin textures. In this report, we present a rapid and spatially resolved imaging method to study the dimensionality-dependent magnetic properties of Fe3GeTe2 (FGT) nanoflakes. Our method is named as polar magneto-optical Kerr imaging microscopy magnetometry (p-MIMM), which is made possible by analyzing the intensity evolution of wide-field polar magneto-optical Kerr effect (MOKE) images that were collected by varying magnetic fields, thicknesses, and temperatures. In particular, spatially resolved MOKE hysteresis loops can be acquired in the FGT nanoflakes with a submicrometer resolution. By analyzing the evolution of the relative (saturated) MOKE intensity as a function of temperature, we further study the critical exponent and universality class and its dependence on the FGT nanoflake thickness. Combining the polar MOKE images with the calculated MOKE hysteresis loops, a detailed magnetic phase diagram summarizing an evolution of the stripe domain, single domain, and paramagnetic state is further validated. Our results suggest that the wide-field p-MIMM can be conveniently used for rapidly examining the magnetic properties of versatile vdW magnetic materials.