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First-principles prediction of sub-10-nm skyrmions in Pd/Fe bilayers on Rh(111)

First-principles prediction of sub-10-nm skyrmions in Pd/Fe bilayers on Rh(111)


Title: First-principles prediction of sub-10-nm skyrmions in Pd/Fe bilayers on Rh(111)
Author: Haldar, Soumyajyoti
von Malottki, Stephan
Meyer, Sebastian
Bessarab, Pavel   orcid.org/0000-0003-3351-7172
Heinze, Stefan
Date: 2018-08-27
Language: English
Scope: 060413
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Physical Review B;98(6)
ISSN: 2469-9950
2469-9969 (eISSN)
DOI: 10.1103/PhysRevB.98.060413
Subject: Skyrmions; Magnetic multilayers; Density functional theory; Landau-Lifshitz model; Segulmagn; Þéttefnisfræði
URI: https://hdl.handle.net/20.500.11815/1007

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Citation:

Haldar, S., von Malottki, S., Meyer, S., Bessarab, P. F., & Heinze, S. (2018). First-principles prediction of sub-10-nm skyrmions in Pd/Fe bilayers on Rh(111). Physical Review B, 98(6), 060413. doi:10.1103/PhysRevB.98.060413

Abstract:

We show that stable skyrmions with diameters of a few nanometers can emerge in atomic Pd/Fe bilayers on the Rh(111) surface. Based on density functional theory we calculate the exchange and the Dzyaloshinskii-Moriya interaction as well as the magnetocrystalline anisotropy energy. The latter two terms are driven by spin-orbit coupling and significantly reduced compared to Pd/Fe bilayers on Ir(111) as expected since Rh and Ir are isoelectronic 4d and 5d transition metals. However, there is still a spin spiral ground state at zero magnetic field. Atomistic spin dynamics simulations show that a skyrmion phase occurs at small magnetic fields of ∼1 T. Skyrmion diameters amount to 2–8 nm and skyrmion lifetimes are up to 1 h at temperatures of 25–45 K.

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©2018 American Physical Society

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