The stability of 3D skyrmions under mechanical stress studied via Monte Carlo calculations

Hog, Sahbi El; Kato, Fumitake; Hongo, Satoshi; Koibuchi, Hiroshi; Diguet, Gildas; Uchimoto, Tetsuya; Diep, H. T.

doi:10.48550/arxiv.2112.02173

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“…Similar anisotropic DMI has been observed in anti-skyrmion systems caused by the D 2d crystal symmetry [27,28]. As a consequence of these energetic changes, mechanical strain can increase the skyrmion stability region [29,30], (as is also seen for applied uniaxial pressure [19]) with Monte-Carlo simulations of anisotropic DMI supporting these results [31,32]. Additionally, there are reports of room-temperature skyrmions existing in strainengineered FeGe thin films [33].…”

Section: Introductionsupporting

confidence: 64%

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Enhanced skyrmion metastability under applied strain in FeGe

T.¹,

Turnbull²,

Wilson³

et al. 2022

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Mechanical straining of skyrmion hosting materials has previously demonstrated increased phase stability through the expansion of the skyrmion equilibrium pocket. Additionally, metastable skyrmions can be generated via rapid field-cooling to form significant skyrmion populations at low temperatures. Using small-angle x-ray scattering and x-ray holographic imaging on a thermally strained 200 nm thick FeGe lamella, we observe temperature-induced strain effects on the structure and metastability of the skyrmion lattice. We find that in this sample orientation (H [1 1 0]) with no strain, metastable skyrmions produced by field cooling through the equilibrium skyrmion pocket vanish from the sample upon dropping below the well known helical reorientation temperature. However, when strain is applied along [1 1 0] axis, and this procedure is repeated, a substantial volume fraction of metastable skyrmions persist upon cooling below this temperature down to 100 K. Additionally, we observe a large number of skyrmions retained after a complete magnetic field polarity reversal, implying that the metastable energy barrier protecting skyrmions from decay is enhanced.

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Section: Introductionsupporting

confidence: 64%

“…Previous computational studies on strain in skyrmion systems suggests that the magnetoelastic coupling induced anisotropic DMI acts to stabilise A-phase skyrmions to higher magnetic fields and lower temperatures [31,32]. To test this prediction, we performed ZFC and FC protocols as previously described and shown in Fig.…”

Section: Resultsmentioning

confidence: 99%