Surface states modulated exchange interaction in Bi2Se3/thulium iron garnet heterostructuresProject supported by the National Key Basic Research Project of China (Grant No. 2016YFA0300600), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33020300), and the National Natural Science Foundation of China (Grant Nos. 11604375 and 11874416).,Chinese Physics B

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Surface states modulated exchange interaction in Bi2Se3/thulium iron garnet heterostructuresProject supported by the National Key Basic Research Project of China (Grant No. 2016YFA0300600), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33020300), and the National Natural Science Foundation of China (Grant Nos. 11604375 and 11874416).
Chinese Physics B ( IF 1.5 ) Pub Date : 2020-11-14 , DOI: 10.1088/1674-1056/abbbdf
Hai-Bin Shi _{1,

2} , Li-Qin Yan _{1,

2} , Yang-Tao Su _{1,

2} , Li Wang _{1,

2} , Xin-Yu Cao _{1,

2} , Lin-Zhu Bi _{1,

2} , Yang Meng _{1,

2} , Yang Sun _{1,

2} , Hong-Wu Zhao _{1,

2,

3}

Affiliation

We investigate the modulation of magnetic anisotropy of thulium iron garnet (TmIG) films by interfaced Bi₂Se₃ thin films. High quality epitaxial growth of Bi₂Se₃ films has been achieved by molecular beam epitaxy on TmIG films. By the method of ferromagnetic resonance, we find that the perpendicular magnetic anisotropy (PMA) of TmIG can be greatly strengthened by the adjacent Bi₂Se₃ layer. Moreover, the competition between topological surface states and thickness dependent bulk states of Bi₂Se₃ gives rise to the modulation of PMA of the Bi₂Se₃/TmIG heterostructures. The interfacial interaction can be attributed to the enhanced exchange coupling between Fe³⁺ ions of TmIG mediated by topological surface electrons of Bi₂Se₃.

更新日期：2020-11-14

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