Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator
Tao Liu, James Kally, Timothy Pillsbury, Chuanpu Liu, Houchen Chang,, Jinjun Ding, Yang Cheng, Maria Hilse, Roman Engel-Herbert, Anthony, Richardella, Nitin Samarth, and Mingzhong Wu
TL;DR
This study demonstrates that topological surface states in Bi2Se3 can significantly alter the magnetic properties of an adjacent Y3Fe5O12 insulator, offering a novel method to control magnetism in thin films.
Contribution
It reveals how topological insulator surface states influence magnetism in a neighboring magnetic insulator, introducing a new approach for magnetic control.
Findings
TSS induce perpendicular magnetic anisotropy in Y3Fe5O12
TSS decrease gyromagnetic ratio in Y3Fe5O12
TSS increase damping in Y3Fe5O12
Abstract
This letter reports the modification of magnetism in a magnetic insulator Y3Fe5O12 thin film by topological surface states (TSS) in an adjacent topological insulator Bi2Se3 thin film. Ferromagnetic resonance measurements show that the TSS in Bi2Se3 produces a perpendicular magnetic anisotropy, results in a decrease in the gyromagnetic ratio, and enhances the damping in Y3Fe5O12. Such TSS-induced changes become more pronounced as the temperature decreases from 300 K to 50 K. These results suggest a completely new approach for control of magnetism in magnetic thin films.
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