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Rapid Kerr imaging characterization of the magnetic properties of two-dimensional ferromagnetic Fe3GeTe2

Authors :
Le Zhao
Chenglin Yu
Wanjun Jiang
Li Cai
Jinsong Zhang
Wei Xia
Yanfeng Guo
Zidong Wang
Yonggang Zhao
Yiqing Dong
Teng Xu
Hengan Zhou
Liangyang Liu
Luyi Yang
Lexian Yang
Source :
Applied Physics Letters. 117:192401
Publication Year :
2020
Publisher :
AIP Publishing, 2020.

Abstract

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.

Details

ISSN :
10773118 and 00036951
Volume :
117
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........ac5687743b7af0fa8f2868c482c2f902