Visualizing ferromagnetic domains in magnetic topological insulators

被引：19
作者：
Wang, Wenbo [1 ]
Yang, Fang [2 ]
Gao, Chunlei [2 ,3 ]
Jia, Jinfeng [2 ,3 ]
Gu, G. D. [4 ]
Wu, Weida [1 ]
机构：
[1] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[2] Shanghai Jiao Tong Univ, Dept Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, Dept Phys & Astron, Collaborat Innovat Ctr Adv Microstruct, Shanghai 200240, Peoples R China
[4] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA
来源：
APL MATERIALS | 2015年 / 3卷 / 08期
关键词：
HGTE QUANTUM-WELLS; FORCE MICROSCOPY; STATE;
D O I：
10.1063/1.4921093
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report a systematic study of ferromagnetic domains in both single-crystal and thin-film specimens of magnetic topological insulators Cr doped (Bi0.1Sb0.9)(2)Te-3 using magnetic force microscopy (MFM). The temperature and field dependences of MFM and in situ resistance data are consistent with previous bulk transport and magnetic characterization. Bubble-like ferromagnetic domains were observed in both single crystals and thin films. Significantly, smaller domain size (similar to 500 nm) with narrower domain wall (similar to 150 - 300 nm) was observed in thin films of magnetic topological insulators, likely due to vertical confinement effect. These results suggest that thin films are more promising for visualization of chiral edge states. (C) 2015 Author(s).
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页数：7
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