Resonant translational, breathing and twisting modes of pinned transverse magnetic domain walls

Abstract

We study translational, breathing and twisting resonant modes of transverse magnetic domain walls pinned at notches in ferromagnetic nanostrips. We demonstrate that a mode's sensitivity to notches depends strongly on the characteristics of that particular resonance. For example, the frequencies of modes involving lateral motion of the wall are the ones which are most sensitive to changes in the notch intrusion depth (especially at the narrower, more strongly confined end of the domain wall). In contrast, the breathing mode, whose dynamics are concentrated away from the notches is relatively insensitive to changes in the notches' sizes. We also demonstrate a sharp drop in the translational mode's frequency towards zero when approaching depinning which is found, using a harmonic oscillator model, to be consistent with a reduction in the local slope of the notch-induced confining potential at its edge.

11 pages, 10 figures, additional data and analysis

References in corpus (9)

• Spin torque building blocks
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Domain wall pinning and potential landscapes created by constrictions and protrusions in ferromagnetic nanowires
• High domain wall velocities due to spin currents perpendicular to the plane
• Sensing magnetic nanoparticles using nano-confined ferromagnetic resonances in a magnonic crystal
• Spin wave assisted current induced magnetic domain wall motion
• Direct observation of Oersted-field-induced magnetization dynamics in magnetic nanostripes
• Resonance in Magnetostatically Coupled Transverse Domain Walls
• Modification of the thermal spin-wave spectrum in a Ni81Fe19 stripe by a domain wall

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• Magnetic domain wall pinning in cobalt ferrite microstructures