Unusual Dzyaloshinskii-Moriya Interaction in Graphene/Fe 3 GeTe 2 Van der Waals Heterostructure.

Autor: Srivastava PK; School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea., Hassan Y; Department of Materials Science and Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34143, South Korea., Lee S; Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota, 55455, USA., Joe M; Department of Materials Science and Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34143, South Korea., Abbas MS; Centre for Advanced Studies in Physics, Government College University Lahore, Lahore, 54000, Pakistan., Ahn H; SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea., Tiwari A; School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India., Ghosh S; School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India., Yoo WJ; SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea., Singh B; School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea., Low T; Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota, 55455, USA., Lee C; Department of Materials Science and Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34143, South Korea.; SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Jun 19, pp. e2402604. Date of Electronic Publication: 2024 Jun 19.
DOI: 10.1002/smll.202402604
Abstrakt: Dzyaloshinskii-Moriya interaction (DMI) is shown to induce a topologically protected chiral spin texture in magnetic/nonmagnetic heterostructures. In the context of van der Waals spintronic devices, graphene emerges as an excellent candidate material. However, due to its negligible spin-orbit interaction, inducing DMI to stabilize topological spins when coupled to 3d-ferromagnets remains challenging. Here, it is demonstrated that, despite these challenges, a sizeable Rashba-type spin splitting followed by significant DMI is induced in graphene/Fe 3 GeTe 2 . This is made possible due to an interfacial electric field driven by charge asymmetry together with the broken inversion symmetry of the heterostructure. These findings reveal that the enhanced DMI energy parameter, resulting from a large effective electron mass in Fe 3 GeTe 2 , remarkably contributes to stabilizing non-collinear spins below the Curie temperature, overcoming the magnetic anisotropy energy. These results are supported by the topological Hall effect, which coexists with the non-trivial breakdown of Fermi liquid behavior, confirming the interplay between spins and non-trivial topology. This work paves the way toward the design and control of interface-driven skyrmion-based devices.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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