Interacting tails of asymmetric domain walls: Theory and experiments

Döring, Lukas; Hengst, Claudia; Otto, Félix; Schäfer, Rudolf

doi:10.1103/physrevb.93.024414

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…The tube-shaped magnetic segment in Fig. 1e that connects the vortex cores at the top surface and bottom surface was confirmed to be an asymmetric Bloch wall (ABW), consisting of OOP Bloch components in the middle part along the disk thickness and IP magnetic components on the disk surface 34–36,38,39 . The ABW formed a flux-closure domain (FCD) in which the Néel caps on the two surfaces point in opposite directions 36,39,40 (see Supplementary Figure 1 and Supplementary Note 1).…”

Section: Resultsmentioning

confidence: 88%

Dynamics of the Bloch point in an asymmetric permalloy disk

Han

Jung

et al. 2019

Nat Commun

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A Bloch point (BP) is a topological defect in a ferromagnet at which the local magnetization vanishes. With the difficulty of generating a stable BP in magnetic nanostructures, the intrinsic nature of a BP and its dynamic behaviour has not been verified experimentally. We report a realization of steady-state BPs embedded in deformed magnetic vortex cores in asymmetrically shaped Ni80Fe20 nanodisks. Time-resolved nanoscale magnetic X-ray imaging combined with micromagnetic simulation shows detailed dynamic character of BPs, revealing rigid and limited lateral movements under magnetic field pulses as well as its crucial role in vortex-core dynamics. Direct visualizations of magnetic structures disclose the unique dynamical feature of a BP as an atomic scale discrete spin texture and allude its influence on the neighbouring spin structures such as magnetic vortices.

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Section: Resultsmentioning

confidence: 88%

Dynamics of the Bloch point in an asymmetric permalloy disk

Han

Jung

et al. 2019

Nat Commun

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“…However, care needs to be exercised once again, since the function sin(θ − β) no longer belongs to L 2 (R), so the standard approach to the definition of − d 2 dx 2 1/2 via Fourier space no longer applies directly. Nevertheless, we show that (16) still holds for the minimizers, provided that one uses the integral representation in (17) as the definition for − d 2…”

Section: Statement Of Resultsmentioning

confidence: 95%

“…via Fourier space no longer applies directly. Nevertheless, we show that ( 16) still holds for the minimizers, provided that one uses the integral representation in (17) as the definition for…”

Section: Statement Of Resultsmentioning

confidence: 97%

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One-dimensional in-plane edge domain walls in ultrathin ferromagnetic films

2018

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We study existence and properties of one-dimensional edge domain walls in ultrathin ferromagnetic films with uniaxial in-plane magnetic anisotropy. In these materials, the magnetization vector is constrained to lie entirely in the film plane, with the preferred directions dictated by the magnetocrystalline easy axis. We consider magnetization profiles in the vicinity of a straight film edge oriented at an arbitrary angle with respect to the easy axis. To minimize the micromagnetic energy, these profiles form transition layers in which the magnetization vector rotates away from the direction of the easy axis to align with the film edge. We prove existence of edge domain walls as minimizers of the appropriate one-dimensional micromagnetic energy functional and show that they are classical solutions of the associated Euler-Lagrange equation with Dirichlet boundary condition at the edge. We also perform a numerical study of these one-dimensional domain walls and uncover further properties of these domain wall profiles.

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“…Soft-magnetic nanowires containing two or more magnetic domains are in the very focus of recent research [1][2][3][4][5]. Describing and controlling the properties of the magnetic fine structure between two domains in a wire, which is commonly addressed as a domain wall, is a field of intense work [6][7][8][9][10][11][12]. Promising technological applications, like the magnetic racetrack memory [13], new sensor devices [14], and logic concepts for magnetic computing [15] have been proposed and are now under development.…”

Section: Introductionmentioning

confidence: 99%

Domain Walls in Bent Nanowires

et al. 2017

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The influence of geometric parameters on the magnetic fine structure of domain walls in bent nanowires is investigated. The domain pattern in the soft-magnetic Co 39 Fe 54 Si 7 alloy is studied via scanning electron microscopy with polarization analysis and modeled via micromagnetic simulations. It is demonstrated that the bending angle affects details of the microstructure as well as the preponderant domain-wall type. A phenomenological model is developed that provides the global energy minimum of individual types of domain walls as a function of the geometric parameters of the wire. The results can be directly transferred to permalloy wires, as permalloy and Co 39 Fe 54 Si 7 alloy have a comparable magnetostatic exchange length.

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Interacting tails of asymmetric domain walls: Theory and experiments

Cited by 6 publications

References 24 publications

Dynamics of the Bloch point in an asymmetric permalloy disk

Dynamics of the Bloch point in an asymmetric permalloy disk

One-dimensional in-plane edge domain walls in ultrathin ferromagnetic films

Domain Walls in Bent Nanowires

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