Correlation between site occupancies and spin-glass transition in skyrmion host 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mrow><mml:mn>10</mml:mn><mml:mo>−</mml:mo><mml:mfrac><mml:mi>x</mml:mi><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Zn</mml:mi><mml:mrow><mml:mn>10</mml:mn><mml:mo>−</mml:mo><mml:mfrac><mml:mi>x</mml:mi><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:msub><mml:msub><mml:mi

Nakajima, Tsuyoshi; Karube, Kosuke; Ishikawa, Yoshihisa; Yonemura, Masao; Reynolds, Neal; White, J. S.; Rønnow, Henrik M.; Kikkawa, Akiko; Tokunaga, Yusuke; Taguchi, Y.; Tokura, Y.; Arima, Taka‐hisa

doi:10.1103/physrevb.100.064407

Cited by 30 publications

(21 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The large difference in τ 0 between the two systems is probably attributed to randomness in the system. In the case of Co-Zn-Mn alloys, there are random site occupancies in the crystal structure; the 8c site is randomly occupied by Co and Mn, and the 12d site is occupied by Co, Zn, and Mn [27][28][29][30]. This gives rise to "weak pinning" in the terminology of density wave physics [68], which may play an important role in the robust metastability of the skyrmion.…”

Section: G Lifetime Of Metastable Skyrmionmentioning

confidence: 99%

See 1 more Smart Citation

Metastable skyrmion lattices governed by magnetic disorder and anisotropy in β -Mn-type chiral magnets

et al. 2020

Self Cite

View full text Add to dashboard Cite

Magnetic skyrmions are vortexlike topological spin textures often observed in structurally chiral magnets with Dzyaloshinskii-Moriya interaction. Among them, Co-Zn-Mn alloys with a β-Mn-type chiral structure host skyrmions above room temperature. In this system, it has recently been found that skyrmions persist over a wide temperature and magnetic field region as a long-lived metastable state, and that the skyrmion lattice transforms from a triangular lattice to a square one. To obtain perspective on chiral magnetism in Co-Zn-Mn alloys and clarify how various properties related to the skyrmion vary with the composition, we performed systematic studies on Co 10 Zn 10 , Co 9 Zn 9 Mn 2 , Co 8 Zn 8 Mn 4 , and Co 7 Zn 7 Mn 6 in terms of magnetic susceptibility and small-angle neutron scattering measurements. Robust metastable skyrmions with extremely long lifetime are commonly observed in all the compounds. On the other hand, the preferred orientation of the helimagnetic propagation vector and its temperature dependence dramatically change upon varying the Mn concentration. The robustness of the metastable skyrmions in these materials is attributed to topological nature of the skyrmions as affected by structural and magnetic disorder. Magnetocrystalline anisotropy as well as magnetic disorder due to frustrated Mn spins play crucial roles in giving rise to the observed change in helical states and corresponding skyrmion lattice form.

show abstract

Section: G Lifetime Of Metastable Skyrmionmentioning

confidence: 99%

“…1(a). The 8c sites are mainly occupied by Co atoms while the 12d sites are mainly occupied by Zn and Mn [27][28][29][30]. The β-Mn-type structure forms in all the solid solutions of (Co 0.5 Zn 0.5 ) 20−x Mn x from Co 10 Zn 10 to Mn 20 (β-Mn itself) [27,31].…”

Section: Introductionmentioning

confidence: 99%

Metastable skyrmion lattices governed by magnetic disorder and anisotropy in β -Mn-type chiral magnets

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…1a) [38]. In a derived alloy Co x Zn y Mn z alloys (x + y + z = 20), Mn atoms mainly occupy the 12d sites, but also share the 8c sites with Co atoms [39,40]. To avoid complications due to the randomness of site occupancies in the Co x Zn y Mn z alloys, we employed a simplified model based on the binary alloy Co 10 Zn 10 .…”

Section: Density Functional Theory (Dft) Calculation Of the Mel Coeff...mentioning

confidence: 99%

Deterministic strain-control of stability and current-induced motion of skyrmions in chiral magnets

Ong¹,

Kim²,

Zhao³

et al. 2020

Preprint

View full text Add to dashboard Cite

External magnetic field, temperature, and spin-polarized current are usually employed to create and control nanoscale vortex-like spin configurations such as magnetic skyrmions. Although these methods have proven successful, they are not energy-efficient due to high power consumption and dissipation. Coupling between magnetic properties and mechanical deformation, the magnetoelastic (MEL) effect, offers a novel approach to energy-efficient control of magnetism at the nanoscale. It is of great interest in the context of ever-decreasing length scales of electronic and spintronic devices. Therefore, it is desirable to establish a comprehensive framework capable of predicting effects of mechanical stress and enabling deterministic control of magnetic textures and skyrmions. In this work, using an advanced scheme of multiscale simulations and Lorentz transmission electron microscopy measurements we demonstrate deterministic control of topological magnetic textures and skyrmion creation in thin films and racetracks of chiral magnets. Our investigation considers not only uniaxial but also biaxial stress, which is ubiquitous in thin-film devices. The biaxial stress, rather than the uniaxial one, was shown to be more efficient to create or annihilate skyrmions when the MEL coefficient and strain have the same or opposite signs, respectively. It was also demonstrated to be a viable way to stabilize skyrmions and to control their current-induced motion in racetrack memory. Our results open prospects for deployment of mechanical stress to create novel topological spin textures, including merons, and in control and optimization of skyrmion-based devices.

show abstract

“…This material has the two crystallographic sites randomly occupied by the two or three elements and the coexistence of the ferromagnetic coupling between Co-Co, Co-Mn, and the antiferromagnetic coupling between Mn-Mn (ref. 34 ). Due to these specific material properties, it is regrettably difficult for the Co-Zn-Mn to fully reproduce the magnetic structures, and therefore in future, more complex simulations should be developed.…”

Section: Resultsmentioning

confidence: 99%

Observation of domain wall bimerons in chiral magnets

Nagase

Yasui

et al. 2021

Nat Commun

View full text Add to dashboard Cite

Topological defects embedded in or combined with domain walls have been proposed in various systems, some of which are referred to as domain wall skyrmions or domain wall bimerons. However, the experimental observation of such topological defects remains an ongoing challenge. Here, using Lorentz transmission electron microscopy, we report the experimental discovery of domain wall bimerons in chiral magnet Co-Zn-Mn(110) thin films. By applying a magnetic field, multidomain structures develop, and simultaneously, chained or isolated bimerons arise as the localized state between the domains with the opposite in-plane components of net magnetization. The multidomain formation is attributed to magnetic anisotropy and dipolar interaction, and domain wall bimerons are stabilized by the Dzyaloshinskii-Moriya interaction. In addition, micromagnetic simulations show that domain wall bimerons appear for a wide range of conditions in chiral magnets with cubic magnetic anisotropy. Our results promote further study in various fields of physics.

show abstract

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2

Cited by 30 publications

References 28 publications

Metastable skyrmion lattices governed by magnetic disorder and anisotropy in β -Mn-type chiral magnets

Metastable skyrmion lattices governed by magnetic disorder and anisotropy in β -Mn-type chiral magnets

Deterministic strain-control of stability and current-induced motion of skyrmions in chiral magnets

Observation of domain wall bimerons in chiral magnets

Contact Info

Product

Resources

About