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arXiv · 2006.04035

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
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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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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. 2020-06-07. Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator. https://doi.org/10.1103/physrevlett.125.017204

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