SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Magnetic Domain Walls (non-skyrmionic)

MA 50.2: Vortrag

Freitag, 31. März 2023, 09:45–10:00, POT 6

Geometry-induced effects in domain wall dynamics in stripes with spatially varying cross section — •Kostiantyn V. Yershov1,2 and Denis D. Sheka31Leibniz Institute for Solid State and Materials Research, Dresden, Germany — 2Bogolyubov Institute for Theoretical Physics, Kyiv, Ukraine — 3Taras Shevchenko National University of Kyiv, Ukraine

Here we study both analytically and numerically the influence of curvature and cross section deformation effects on the motion of a domain wall in curved stripes which corresponds to geometry of recent experiments [1]. We base our study on a phenomenological Landau–Lifshitz–Gilbert equations using collective variable approach based on a q−Φ model. We show that (i) curvature and nonzero gradient of cross-section deformation result in a modification of a ground state and can be interpreted as an effective magnetic field. (ii) The presence of a nonzero gradient of cross section deformation also results in a pinning potential for domain walls in addition to the curvature-induced potential [2]. In effective equations of motions the spatially varying cross section and curvature appear as a driving forces which can suppress or reinforce the action of each other. The eigenfrequency oscillations of domain wall in vicinity of the pinning potential is obtained as a function of curvature and cross section deformation and their gradients. All analytical predictions are well confirmed by full scale micromagnetic simulations. [1] L. Skoric et al, ACS Nano 16, 8860 (2022); [2] K. V. Yershov et al, PRB 92, 104412 (2015).

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