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Stability and lifetime of antiferromagnetic skyrmions

Stability and lifetime of antiferromagnetic skyrmions

Title: Stability and lifetime of antiferromagnetic skyrmions
Author: Bessarab, Pavel
Yudin, D.
Gulevich, D. R.
Wadley, P.
Titov, M.
Tretiakov, Oleg A.
Date: 2019-04-26
Language: English
Scope: 140411(R)
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;99(14)
ISSN: 2469-9950
2469-9969 (eISSN)
DOI: 10.1103/PhysRevB.99.140411
Subject: Skyrmions; Antiferromagnets; Dzyaloshinskii-Moriya interaction; Eðlisfræði; Þéttefnisfræði
URI: https://hdl.handle.net/20.500.11815/1527

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Bessarab, P. F., Yudin, D., Gulevich, D. R., Wadley, P., Titov, M., & Tretiakov, O. A. (2019). Stability and lifetime of antiferromagnetic skyrmions. Physical Review B, 99(14), 140411. doi:10.1103/PhysRevB.99.140411


The two-dimensional Heisenberg exchange model with out-of-plane anisotropy and a Dzyaloshinskii-Moriya interaction is employed to investigate the lifetime and stability of antiferromagnetic (AFM) skyrmion as a function of temperature and external magnetic field. An isolated AFM skyrmion is metastable at zero temperature in a certain parameter range set by two boundaries separating the skyrmion state from the uniform AFM phase and a stripe domain phase. The distribution of the energy barriers for the AFM skyrmion decay into the uniform AFM state complements the zero-temperature stability diagram and demonstrates that the skyrmion stability region is significantly narrowed at finite temperatures. We show that the AFM skyrmion stability can be enhanced by an application of magnetic field, whose strength is comparable to the spin-flop field. This stabilization of AFM skyrmions in external magnetic fields is in sharp contrast to the behavior of their ferromagnetic counterparts. Furthermore, we demonstrate that the AFM skyrmions are stable on the timescales of milliseconds below 50 K for realistic material parameters, making it feasible to observe them in modern experiments.


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