Opin vísindi

Interplay between size and stability of magnetic skyrmions

Interplay between size and stability of magnetic skyrmions


Title: Interplay between size and stability of magnetic skyrmions
Author: Varentsova, A.S.
Potkina, Maria   orcid.org/0000-0002-1380-2454
von Malottki, S.
Heinze, S.
Bessarab, Pavel   orcid.org/0000-0003-3351-7172
Date: 2018-06-24
Language: English
Scope: 356-363
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: Nanosystems: Physics, Chemistry, Mathematics;9(3)
ISSN: 2220-8054
DOI: 10.17586/2220-8054-2018-9-3-356-363
Subject: Magnetic skyrmion; Thermal stability; Energy barrier; Þéttefnisfræði; Grannfræði; Segulmagn; Eðlisfræði
URI: https://hdl.handle.net/20.500.11815/1077

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Abstract:

The relationship between the size and stability of isolated skyrmions in a magnetic monolayer is analyzed based on minimum energy path calculations and atomistic spin Hamiltonian. It is demonstrated that the energy barrier protecting the skyrmion from collapse to the ferromagnetic state is not uniquely defined by the skyrmion size, although these two properties as functions of relevant material parameters follow similar trends. Stability of nanoscale skyrmions can be enhanced by a concerted adjustment of material parameters. The proposed parameter transformation conserves the skyrmion size, but does not conserve the skyrmion shape which changes from an arrow-like pattern to a profile that resembles magnetic bubbles. This transformation of the skyrmion shape is accompanied by an increase in the collapse energy barrier and thus enhancement of skyrmion stability.

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