Surface states modulated exchange interaction in Bi2Se3/thulium iron garnet heterostructures  

作　　者：Hai-Bin Shi Li-Qin Yan Yang-Tao Su Li Wang Xin-Yu Cao Lin-Zhu Bi Yang Meng Yang Sun Hong-Wu Zhao 石海滨;闫丽琴;苏仰涛;王力;曹昕宇;毕林竹;孟洋;孙阳;赵宏武(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2020年第11期151-155,共5页中国物理B（英文版）

基　　金：Project 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);the National Natural Science Foundation of China(Grant Nos.11604375 and 11874416)。

摘　　要：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 Fe^3+ions of TmIG mediated by topological surface electrons of Bi2Se3.

关 键 词：topological surface states interfacial exchange coupling perpendicular magnetic anisotropy 

分 类 号：O469[理学—凝聚态物理]