Tuning scalar spin chirality in ultrathin films of the kagome-lattice ferromagnet Fe3Sn

被引：6

作者：

Fujiwara, Kohei ^{[1
]}

Kato, Yasuyuki ^{[2
]}

Seki, Takeshi ^{[1
,3
]}

Nomura, Kentaro ^{[1
,3
]}

Takanashi, Koki ^{[1
,3
,4
]}

Motome, Yukitoshi ^{[2
]}

Tsukazaki, Atsushi ^{[1
,3
,4
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[3] Tohoku Univ, Ctr Spintron Res Network CSRN, Sendai, Miyagi 9808577, Japan

[4] Tohoku Univ, Ctr Sci & Innovat Spintron CSIS, Core Res Cluster, Sendai, Miyagi 9808577, Japan

来源：

COMMUNICATIONS MATERIALS | 2021年 / 2卷 / 01期

关键词：

TEMPERATURE MAGNETIC SKYRMIONS; BERRY PHASE; DYNAMICS;

D O I：

10.1038/s43246-021-00218-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Non-coplanar spin textures with finite scalar spin chirality can be artificially induced at surfaces and interfaces through the interfacial Dzyaloshinskii-Moriya interaction. However, stabilizing a proper magnetic skyrmion crystal via this route remains elusive. Here, using an epitaxial bilayer of platinum and geometrically frustrated kagome-lattice ferromagnet Fe3Sn, we show the possible formation of a two-dimensional skyrmion crystal under well-regulated Fe3Sn thickness conditions. Magnetization measurements reveal that the magnetic anisotropy is systematically varied from an inherent in-plane type to a perpendicular type with the thickness reduction. Below approximately 0.5 nm, we clearly detect a topological Hall effect that provides evidence for finite scalar spin chirality. Our topological Hall effect analysis, combined with theoretical simulations, not only establishes its interfacial Dzyaloshinskii-Moriya interaction origin, but also indicates the emergence of a stable skyrmion crystal phase, demonstrating the potential of kagome-lattice ferromagnets in spin chirality engineering using thin-film nanostructures. Magnetic skyrmions are swirling topological spin textures induced by chiral interactions in non-centrosymmetric systems. Here, a Pt-Fe3Sn bilayer exhibits a thickness-dependent magnetic anisotropy and interfacial Dzyaloshinskii-Moriya interaction that are key to the controlled stabilization of a skyrmion crystal.

引用

页数：7