Crystal-orientation dependence of magnetic domain structures in the skyrmion-hosting magnets MnNiGa

Ding, Bei; Li, Hang; Li, Xiyang; Wang, Yue; Hou, Zhipeng; Xu, Guizhou; Liu, Enke; Wu, Guangheng; Wang, Fangwei; Wang, Wenhong

doi:10.1063/1.5027800

Cited by 14 publications

(15 citation statements)

References 28 publications

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“…6(d)]. This phenomenon has been observed in the study of the crystal direction dependence of the domains in off-stoichiometric (Mn 1−x Ni x ) 65 Ga 35 alloys [26]. With lowering K u , the biskyrmion state can be stabilized under a certain field and maintained when K u is tilted.…”

Section: Resultsmentioning

confidence: 73%

“…Yao et al [24] and Loudon et al [25] have argued that the biskyrmions under Lorentz transmission electron microscopy (TEM) can possibly be depicted as an inclined type-II (topological trivial) bubble. But we notice that there are distinguished features in the Lorentz TEM images of biskyrmion and its trivial bubble that are obtained in the same material, for example, in the different crystal orientations of (Mn 1−x Ni x ) 65 Ga 35 [26] or in the small-Ga-substituted MnNiGa alloys [20]. Therefore, as an important type of skyrmion state, its formation origin and stability condition deserves in-depth study.…”

Section: Introductionmentioning

confidence: 75%

“…However, in x = 0.4, a distinct large-width stripe (∼570 nm) is identified at zero field, and the skyrmion formation is absent upon increasing field. The line scan of the stripe domains showed that the domain walls of x = 0.05 and 0.3 are thicker and the magnetization in the interval varies continually (especially in x = 0.05), representing the typical ground states that tend to form bubblelike domains [26,41], while at x = 0.4, the Lorentz contrast is sharp across the wall and a large quantity of spins lie stably in the film plane. The wide in-plane stripes are not favorable to accommodate skyrmion or bubble domains under the field but only become narrowed until disappearing, like those observed in Ref.…”

Section: Resultsmentioning

confidence: 99%

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Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation

You

Tang

et al. 2019

Phys. Rev. B

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Skyrmions with multiple helicity or topology in centrosymmetric crystals are intriguing magnetic-domain objects due to their diverse dynamics under external stimuli. Here we illustrate how the two key gradients of magnetocrystalline anisotropy (MCA) and spin reorientation transition (SRT) affect the skyrmion formation and topology by Cu substitution in the biskyrmion-host MnNiGa alloy. The MCA and SRT are simultaneously tuned in a large scope, while the original high Curie temperature (TC) is retained. Detailed neutron-scattering studies revealed the construction of a noncollinear canted magnetic structure below the SRT temperature (TSR), which effectively correlates the SRT with the evolution of the MCA, as well as the exchange interaction. The Cu substitution raises the TSR to merge with the TC, and meanwhile, reduces the c-axis anisotropy. Lorentz transmission electron microscopy revealed the formation of stacked biskyrmions from above room temperature to lower temperatures in MnNi1-xCuxGa(x=0-0.3) in the presence of proper MCA. Micromagnetic simulations further confirmed the great effect of uniaxial anisotropy on the stabilization of biskyrmions. Our work has helped clarify the evolution of magnetic structures and their correlation to the SRT, providing an account of the effect of MCA and exchange interaction on the biskyrmion formation.

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Section: Resultsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation

You

Tang

et al. 2019

Phys. Rev. B

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“…The ma- chirality of the skyrmion bubbles. 7 Various magnetic domains were observed on the wedge-shaped alloy specimen [35], in the present study, we only focus on the magnetic stripes along the [001] axis as shown in Fig. 1(d).…”

Section: Micromagnetic Simulationsmentioning

confidence: 99%

Manipulating Spin Chirality of Magnetic Skyrmion Bubbles by In-Plane Reversed Magnetic Fields in (Mn1−xNix)65Ga3

Ding

Cui

et al. 2019

Phys. Rev. Applied

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Understanding the dynamics of the magnetic skyrmion, a particle-like topologically stable spin texture, and its response dynamics to external fields are indispensable for the applications in spintronic devices. In this letter, the Lorentz transmission electron microscopy (LTEM) was used to investigate the spin chirality of the magnetic skyrmion bubbles (SKBs) in the centrosymmetric magnet MnNiGa at room temperature. The reversal of SKBs excited by the in-plane magnetic field has been revealed.Moreover, the collective behavior of interacting spin chirality can be manipulated by reversing the directions of the magnetic fields on a wedge-shaped thin plate. The dynamic behavior of the bubbles at different position of the thin plate has been explored with the micromagnetic simulation, indicating a non-uniform and nontrivial dynamic magnetization on the surfaces and center of the thin plate during the spin chirality reversal. The results suggest that the controllable symmetry breaking of the SKBs arising from thickness variation provides an ability to manipulate the collective behavior of the spin chirality with small external fields, leading to a promising application in nonvolatile spintronic devices for magnetic skyrmions.

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“…The material parameters of MnNiGa alloy are listed as follows [17]: exchange stiffness A = 2 × 10 −11 J • m −1 , saturation magnetization M s = 5.16 × 10 5 A • m −1 , and uniaxial anisotropy K u = 8.7 × 10 4 J • m −3 . Previous studies report that the crystal orientation, thus the magnetic easy axis direction, is a key ingredient to form biskyrmions [33]. Hence, we perform simulations with the easy axis at a tilted angle of 31 • as in the [12 2] crystal [33].…”

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confidence: 99%

Three-dimensional structure and formation mechanism of biskyrmions in uniaxial ferromagnets

Wang,

Zhou

et al. 2022

Preprint

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Magnetic biskyrmions are observed in experiments but their existences are still under debate. In this work, we present the existence of biskyrmions in a magnetic film with tilted uniaxial anisotropy via micromagnetic simulations. We find biskyrmions and bubbles share a unified three-dimensional structure, in which the relative position of two intrinsic Bloch points dominates the two-dimensional topological property in the film middle. The film edge can drive Bloch points and transform bubbles into biskyrmions via the demagnetizing field. This mechanism is found in the formation process of biskyrmions in confined geometry under zero field. Our work clarifies the structure and formation mechanism of biskyrmions, emphasizing the three-dimensional aspect of skyrmion-related nanostructures.

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Crystal-orientation dependence of magnetic domain structures in the skyrmion-hosting magnets MnNiGa

Cited by 14 publications

References 28 publications

Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation

Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation

Manipulating Spin Chirality of Magnetic Skyrmion Bubbles by In-Plane Reversed Magnetic Fields in (Mn1−xNix)65Ga3

Three-dimensional structure and formation mechanism of biskyrmions in uniaxial ferromagnets

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