Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator.,Physical Review Letters

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Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-01 , DOI: 10.1103/physrevlett.125.017204
Tao Liu ₁ , James Kally ₂ , Timothy Pillsbury ₂ , Chuanpu Liu ₁ , Houchen Chang ₁ , Jinjun Ding ₁ , Yang Cheng ₃ , Maria Hilse ₂ , Roman Engel-Herbert ₂ , Anthony Richardella ₂ , Nitin Samarth ₂ , Mingzhong Wu ₁

Affiliation

We report the modification of magnetism in a magnetic insulator

Y_{3} {Fe}_{5} O_{12}

thin film by topological surface states (TSS) in an adjacent topological insulator

{Bi}_{2} {Se}_{3}

thin film. Ferromagnetic resonance measurements show that the TSS in

{Bi}_{2} {Se}_{3}

produces a perpendicular magnetic anisotropy, results in a decrease in the gyromagnetic ratio, and enhances the damping in

Y_{3} {Fe}_{5} O_{12}

. 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.

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