Thermal creation of skyrmions in ferromagnetic films with perpendicular anisotropy and Dzyaloshinskii-Moriya interaction

Garanin, D. A.; Chudnovsky, Eugene M.; Zhang, Senfu; Zhang, Xixiang

doi:10.1016/j.jmmm.2019.165724

Cited by 15 publications

(9 citation statements)

References 64 publications

(70 reference statements)

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“…Furthermore, the defects suppress the skyrmion grown, and the skyrmions are compressed with the average diameter nearly decreasing to a half at x = 5%. At x = 10%, the skyrmion diameters further shrink and are hardly measured due to too high size dispersions and so many nonmagnetic spin vacancies, although the skyrmions can still be identified through Q. Garanin et al [62] using Monte Carlo simulations studied the thermal creation of skyrmion crystals in a 2D ferromagnetic film with perpendicularly magnetic anisotropy and DMI. At zero temperature, the skyrmions only appear in the magnetization process in the presence of static disorder, while the thermal fluctuations violate the conservation of the topological charge and tend to suppress skyrmions through reducing magnetic anisotropy.…”

Section: Resultsmentioning

confidence: 99%

Zero-field skyrmions in FeGe thin films stabilized through attaching a perpendicularly magnetized single-domain Ni layer*

Zhang

2021

Chinese Phys. B

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A numerical study reports that the zero-field skyrmions in FeGe thin films are stabilized when a FeGe layer is exchange coupled to a single-domain Ni layer, which has been magnetized perpendicularly. Due to the small thickness, an easy-plane anisotropy in the FeGe layer is taken into account, and the skyrmion-crystal state is favored to appear for low anisotropies and intermediate FeGe/Ni interlayer exchange couplings, and finally transformed from a labyrinth-like and into an out-of-plane uniform state for the large couplings or into an in-plane state for the high anisotropies. Furthermore, the maximum skyrmion charge number is bigger for the periodic and fixed boundary conditions with an out-of-plane magnetization; on the contrary, the Bloch-type skyrmions can be frozen and stabilized for the larger couplings on the fixed boundary with an in-plane magnetization, similar to the experimental results of the magnetic-field-induced skyrmions. Finally, the skyrmion charge number and diameter both decrease if the nonmagnetic defects exist, and the skyrmion centers are prone to being captured by defect sites. This work evidences that the ensembles of homochiral skyrmions stabilized in the multilayers fabricated by well-established technologies present a roadmap to design new classes of the materials that can host skyrmions.

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Section: Resultsmentioning

confidence: 99%

Zero-field skyrmions in FeGe thin films stabilized through attaching a perpendicularly magnetized single-domain Ni layer*

Zhang

2021

Chinese Phys. B

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“…Mehmood et al 30 showed that the skyrmion shape can be manipulated by changing the perpendicular magnetic anisotropy. Garanin et al 31 observed a few elliptical skyrmions in a numerical experiment produced by freezing a system of labyrinth domains down to zero temeperature.…”

Section: Introductionmentioning

confidence: 99%

Elliptical skyrmions: theory and nucleation by a magnetic tip in an antiskyrmion-hosting material

Capic

2022

Preprint

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Motivated by experimental findings in [ 1 ] and [ 2 ], we find an elliptical skyrmion can be nucleated in a material with a Dzyaloshinskii-Moriya interaction (DMI) that supports antiskyrmions. The DMI favors the elongation of the skyrmion along a given direction so that it is characterized by two size parameters. We derive analytical properties of the elliptical skyrmion using the Belavin-Polyakov (BP) pure exchange model. We show that the DMI which typically favors isotropic skyrmions or antiskyrmions, respectively, can also support elliptical antiskyrmions or skyrmions, respectively. Using the real material parameters extracted from 1 and including all relevant interactions, numerical computations indicate that the elliptical skyrmion can be nucleated from the stripe or labyrinth domain state by a magnetic force microscope tip in a thin film with a DMI favoring antiskyrmions that consists of at least a few atomic layers.

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“…In particular, dipole-dipole interaction will be important in systems with centrosymmetry, such as manganites. In case of non-centrosymmetric systems, another anisotropic exchange interaction called Dzyaloshinskii Moriya interaction can also help in stabilization of ferromagnetism/antiferromagnetism in 2D systems 13 . Here, the anisotropy of the system favors a specific spin component which opens a gap in the spin wave spectrum that suppress the effect of thermal fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Multiple magnetic phase transitions with different universality classes in bilayer La$$_{1.4}$$Sr$$_{1.6}$$Mn$$_{2}$$O$$_7$$ manganite

Kumar

Tiwari

Chauhan

et al. 2021

Sci Rep

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Here, we report three magnetic transitions at 101 K (T$$_{C1}$$ C 1 ), 246 K (T$$_{C2}$$ C 2 ) and 295 K (T$$_{C3}$$ C 3 ) in bilayer La$$_{1.4}$$ 1.4 Sr$$_{1.6}$$ 1.6 Mn$$_{2}$$ 2 O$$_7$$ 7 . The second order phase transitions have been identified at these transition points with the help of change in entropy analysis and modified Arrott plots (MAPs). The critical behavior around T$$_{C1}$$ C 1 , T$$_{C2}$$ C 2 and T$$_{C3}$$ C 3 have been studied by MAPs and Kouvel–Fisher method. Based on these analyses four magnetic phases are: (1) 2D Ising ferromagnetic (FM) below T$$_{C1}$$ C 1 ,(2) 2D Heisenberg canted antiferromagnetic (CAFM-I) and FM clusters in temperature range T$$_{C1}$$ C 1 < T < T$$_{C2}$$ C 2 , (3) 2D Heisenberg CAFM-II and FM clusters with non magnetically interacting planes in temperature range T$$_{C2}$$ C 2 < T < T$$_{C3}$$ C 3 and (4) paramagnetic for T > T$$_{C3}$$ C 3 .

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Thermal creation of skyrmions in ferromagnetic films with perpendicular anisotropy and Dzyaloshinskii-Moriya interaction

Cited by 15 publications

References 64 publications

Zero-field skyrmions in FeGe thin films stabilized through attaching a perpendicularly magnetized single-domain Ni layer*

Zero-field skyrmions in FeGe thin films stabilized through attaching a perpendicularly magnetized single-domain Ni layer*

Elliptical skyrmions: theory and nucleation by a magnetic tip in an antiskyrmion-hosting material

Multiple magnetic phase transitions with different universality classes in bilayer La$$_{1.4}$$Sr$$_{1.6}$$Mn$$_{2}$$O$$_7$$ manganite

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