Current-induced magnetization switching at charge-transferred interface between topological insulator (Bi,Sb)2Te3 and van der Waals ferromagnet Fe3GeTe2

Reika Fujimura, Ryutaro Yoshimi, Masataka Mogi, Atsushi Tsukazaki, Minoru Kawamura, Kei S. Takahashi, Masashi Kawasaki, Yoshinori Tokura

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Ferromagnetic two-dimensional van der Waals materials attract enormous interest as a platform to explore spin-related quantum phenomena, especially in conjunction with other quantum materials. Topological insulator is one such candidate to form the junction, because the spin-polarized nature of the surface or interface Dirac states enables the highly efficient spin-charge conversion. Here, we report the current-driven magnetization switching in the bilayer film of a van der Waals ferromagnetic semimetal Fe3GeTe2 (FGT) and a topological insulator (Bi1−xSbx)2Te3 (BST). We observed the current-induced magnetization switching via the Edelstein effect in a wide temperature range, whose threshold current density is as small as that reported for the heterostructure of FGT with a Pt layer. By analyzing the transport properties in heterostructures with different Fermi level (EF) positions in the BST layer, we found that the EF position of the charge-transferred interface Dirac states causes the significant variation of the threshold current density with a Bi/Sb ratio. The present result may promise spintronic phenomena in heterostructures of 2D van der Waals ferromagnets with topological insulators/semimetals.

本文言語English
論文番号032402
ジャーナルApplied Physics Letters
119
3
DOI
出版ステータスPublished - 2021 7月 19

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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