Open AccessChiral-Bubble-Induced Topological Hall Effect in Ferromagnetic Topological Insulator Heterostructures
Author(s) -
Wenbo Wang,
Yi Zhao,
Fei Wang,
Matthew W. Daniels,
CuiZu Chang,
Jiadong Zang,
Di Xiao,
Weida Wu
Publication year - 2021
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/acs.nanolett.0c04567
Subject(s) - spintronics , topological insulator , condensed matter physics , ferromagnetism , hall effect , domain wall (magnetism) , topology (electrical circuits) , nucleation , physics , heterojunction , magnetic field , materials science , quantum mechanics , mathematics , magnetization , combinatorics , thermodynamics
We report compelling evidence of an emergent topological Hall effect (THE) from chiral bubbles in a two-dimensional uniaxial ferromagnet, V-doped Sb 2 Te 3 heterostructure. The sign of THE signal is determined by the net curvature of domain walls in different domain configurations, and the strength of THE signal is correlated with the density of nucleation or pinned bubble domains. The experimental results are in good agreement with the integrated linear transport and Monte Carlo simulations, corroborating the emergent gauge field at chiral magnetic bubbles. Our findings not only reveal a general mechanism of THE in two-dimensional ferromagnets but also pave the way for the creation and manipulation of topological spin textures for spintronic applications.