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- Title
The Topological Hall Effect in CoGd Films Controlled by Hydrogen Migration under Gate Voltage.
- Authors
Ren, Xue; Liu, Liang; Cui, Bin; Cheng, Bin; Zhao, Xiangxiang; An, Taiyu; Chu, Ruiyue; Zhang, Mingfang; Liu, Weikang; Zhou, Guangjun; Kuai, Weijie; Hu, Jifan
- Abstract
The topological Hall effect (THE) presents hump signals in the Hall resistance versus magnetic field hysteresis loop, showing promise for future spintronics due to its robust chiral magnetic textures. Here, it is shown that solid‐state protonic gating can control possible topological magnetic structures in CoGd thin films. Injecting H+ leads to sizable hump signals in the film. Magneto‐optical Kerr microscopy shows that induced hump signals in transporting measurements do not scale with magnetization, supporting topological magnetism. Successive hydrogen ion extraction completely erases the effect. Thus, topological magnetism manipulations are reversible, nonvolatile, and effective. Ab inito calculations and effective chiral spin models demonstrate that hydrogen injection remarkably enhances the Dzyaloshinskii–Moriya interaction over fourfold, stabilizing chiral structures contributing to the large THE. These findings reveal the vital role of hydrogen ions in topological magnetism and suggest that amorphous ferrimagnetic CoGd thin films are outstanding platforms for realizing controllable topological spintronics at room temperature.
- Subjects
SCHWABISCH Hall (Germany); HALL effect; MAGNETIC structure; MAGNETIC hysteresis; IMMIGRATION enforcement; MAGNETIC fields; CHIRALITY of nuclear particles; QUANTUM Hall effect
- Publication
Advanced Electronic Materials, 2024, Vol 10, Issue 5, p1
- ISSN
2199-160X
- Publication type
Article
- DOI
10.1002/aelm.202300752