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, Mingzhong Wu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We report 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 to 50 K. These results suggest a completely new approach for control of magnetism in magnetic thin films.

Original languageEnglish (US)
Article number017204
JournalPhysical review letters
Volume125
Issue number1
DOIs
StatePublished - Jul 3 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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