Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>OSeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Halder, M.; Chacon, Alfonso; Bauer, Andreas; Simeth, W.; Mühlbauer, S.; Berger, H.; Heinen, Lukas; Garst, Markus; Rosch, Achim; Pfleiderer, C.

doi:10.1103/physrevb.98.144429

Cited by 41 publications

(67 citation statements)

References 45 publications

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“…These phase diagrams contrast dramatically with the phase diagram seen for bulk Cu 2 OSeO 3 , where the helical state transitions to the conical state (which would not show scattering peaks in our SAXS geometry) by 25 mT [110] or 100 mT [100], and the skyrmion state only extends over a small field range between 56 and 58 K [37]. These differences likely arise primarily from anisotropies caused by the thinning of the samples making it unfavorable for the helical propagation vector to be directed out of plane.…”

Section: Resultscontrasting

confidence: 61%

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Stability and metastability of skyrmions in thin lamellae ofCu2OSeO3

Wilson

Birch

Štefančič

et al. 2020

Phys. Rev. Research

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We report small angle X-ray scattering (SAXS) measurements of the skyrmion lattice in two 200 nm thick Cu2OSeO3 lamellae aligned with the applied magnetic field parallel to the out of plane [110] or [100] crystallographic directions. Our measurements show that the equilibrium skyrmion phase in both samples is expanded significantly compared to bulk crystals, existing between approximately 30 and 50 K over a wide region of magnetic field. This skyrmion state is elliptically distorted at low fields for the [110] sample, and symmetric for the [100] sample, possibly due to crystalline anisotropy becoming more important at this sample thickness than it is in bulk samples. Furthermore, we find that a metastable skyrmion state can be observed at low temperature by field cooling through the equilibrium skyrmion pocket in both samples. In contrast to the behavior in bulk samples, the volume fraction of metastable skyrmions does not significantly depend on cooling rate. We show that a possible explanation for this is the change in the lowest temperature of the skyrmion state in this lamellae compared to bulk, without requiring different energetics of the skyrmion state. arXiv:1909.07855v1 [cond-mat.str-el]

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Section: Resultscontrasting

confidence: 61%

“…More information on the behavior of the equilibrium and metastable skyrmion states in thin lamellae of Cu 2 OSeO 3 will be important to inform future research into skyrmions. In particular, understanding how they are affected by crystal orientation is important, as this has been found to be significant in bulk samples [37].…”

Section: Introductionmentioning

confidence: 99%

Stability and metastability of skyrmions in thin lamellae ofCu2OSeO3

Wilson

Birch

Štefančič

et al. 2020

Phys. Rev. Research

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“…This putative contradiction connects to the recent discovery that Cu 2 OSeO 3 not only hosts a skyrmion lattice at high temperatures, common to all cubic chiral magnets, but also an independent second skyrmion phase at low temperatures [25,49]. In contrast to the high-temperature phase, the low-temperature phase stabilized by magneto-crystalline anisotropies and exists only for field values around H c2 applied along [001].…”

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confidence: 99%

“…Subtle changes in the curve's slope indicate phase transitions which are discussed in more detail in Refs. [41,48,49]. As the magnetic contribution includes terms linear and quadratic in M , the intensity curve is not symmetric with respect to zero field.…”

mentioning

confidence: 99%

“…REXS-FMR also allows for stroboscopic measurements in order to determine the character of eigenmodes microscopically, e.g., to distinguish between gyration and breathing modes. Also note that the selectivity to certain magnetic phases may prove particularly useful in complex magnetic environments for which the clear identification of eigenmodes in conventional microwave spectroscopy is challenging, such as for multi-domain skyrmion states in lacunar spinels [14,59,60], glassy skyrmionic textures in Co-Mn-Zn compounds [61][62][63], or the low-temperature skyrmion state in Cu 2 OSeO 3 with its concomitant tilted conical state [25,49,64].…”

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confidence: 99%

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Ferromagnetic Resonance with Magnetic Phase Selectivity by Means of Resonant Elastic X-Ray Scattering on a Chiral Magnet

et al. 2019

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Cubic chiral magnets, such as Cu 2 OSeO 3 , exhibit a variety of non-collinear spin textures, including a trigonal lattice of spin whirls, so-called skyrmions. Using magnetic resonant elastic x-ray scattering (REXS) on a crystalline Bragg peak and its magnetic satellites while exciting the sample with magnetic fields at GHz frequencies, we probe the ferromagnetic resonance modes of these spin textures by means of the scattered intensity. Most notably, the three eigenmodes of the skyrmion lattice are detected with large sensitivity. As this novel technique, which we label REXS-FMR, is carried out at distinct positions in reciprocal space, it allows to distinguish contributions originating from different magnetic states, providing information on the precise character, weight and mode mixing as a prerequisite of tailored excitations for applications. arXiv:1909.08293v2 [cond-mat.mtrl-sci]

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Tuning the Disconnected Magnetic Phase by Regulating the Lattice Distortion in FeSi1−xGex Alloys

Huang

Chen

et al. 2022

J. Electron. Mater.

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Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase inCu2OSeO3

Cited by 41 publications

References 45 publications

Stability and metastability of skyrmions in thin lamellae ofCu2OSeO3

Stability and metastability of skyrmions in thin lamellae ofCu2OSeO3

Ferromagnetic Resonance with Magnetic Phase Selectivity by Means of Resonant Elastic X-Ray Scattering on a Chiral Magnet

Tuning the Disconnected Magnetic Phase by Regulating the Lattice Distortion in FeSi1−xGex Alloys

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