Chiral spin-transfer torque induced by curvature gradient.

Autor:	Bittencourt GHR; Universidade Federal de Viçosa, Departamento de Física, Avenida Peter Henry Rolfs s/n, 36570-000, Viçosa, MG, Brasil. vagson.santos@ufv.br.; Instituto Federal de Santa Catarina, R. Aloísio Stoffel, 89885-000, São Carlos, SC, Brasil., Castro M; Universidad de Santiago de Chile, Departamento de Física, Cedenna, Avda. Víctor Jara 3493, Estación Central, Santiago, Chile., Nunez AS; Departamento de Física, FCFM, Universidad de Chile, Santiago, Chile., Altbir D; Universidad Diego Portales, Ejército 441, CEDENNA, Santiago, Chile., Allende S; Universidad de Santiago de Chile, Departamento de Física, Cedenna, Avda. Víctor Jara 3493, Estación Central, Santiago, Chile., Carvalho-Santos VL; Universidade Federal de Viçosa, Departamento de Física, Avenida Peter Henry Rolfs s/n, 36570-000, Viçosa, MG, Brasil. vagson.santos@ufv.br.
Jazyk:	angličtina
Zdroj:	Nanoscale [Nanoscale] 2024 Sep 19; Vol. 16 (36), pp. 16844-16851. Date of Electronic Publication: 2024 Sep 19.
DOI:	10.1039/d4nr01068j
Abstrakt:	This work analyzes the propagation of a transverse domain wall (DW) under the action of an electric current along a nanowire with a curvature gradient. Our results evidence that the curvature gradient induces a chiral spin-transfer torque (CSTT) whose effect on the DW dynamics depends on the direction along which the DW points, evidencing a curvature-induced non-reciprocity in the current-driven DW motion. The origin of the CSTT is explained in terms of a position-dependent effective field associated with the DW profile and the electric current direction. This current-driven chiral effect is responsible for direction-dependent reinforcing or blocking the DW propagation. The emergence of curvature-induced chiral spin transport is a phenomenon to consider when designing spintronic devices.
Databáze:	MEDLINE
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