Domain walls within domain walls in wide ferromagnetic strips

Abstract

We carry out large-scale micromagnetic simulations which demonstrate that due to topological constraints, internal domain walls (Bloch lines) within extended domain walls are more robust than domain walls in nanowires. Thus, the possibility of spintronics applications based on their motion channeled along domain walls emerges. Internal domain walls are nucleated within domain walls in perpendicularly magnetized media concurrent with a Walker breakdown-like abrupt reduction of the domain wall velocity above a threshold driving force, and may also be generated within pinned, localized domain walls. We observe fast field and current driven internal domain wall dynamics without a Walker breakdown along pinned domain walls, originating from topological protection of the internal domain wall structure due to the surrounding out-of-plane domains.

5 pages, 6 figures

References in corpus (6)

• The design and verification of Mumax3
• Fractional vortices and composite domain walls in flat nanomagnets
• Effects of Disorder and Internal Dynamics on Vortex Wall Propagation
• Head-to-Head Domain Wall Structures in Wide Permalloy Strips
• The effect of disorder on transverse domain wall dynamics in magnetic nanostrips
• Current-Driven Motion of Magnetic Domain Wall with Many Bloch Lines

Cited by in corpus (10)

• Barkhausen noise from precessional domain wall motion
• Current-driven skyrmion Depinning in Magnetic Granular Films
• Bloch line dynamics within moving domain walls in 3D ferromagnets
• Antiferromagnetic Bloch line driven by spin current as room-temperature analog of a fluxon in a long Josephson junction
• Depinning exponents of thin film domain walls depend on disorder strength
• Tuning Ginzburg-Landau theory to quantitatively study thin ferromagnetic materials
• Multistep Bloch-line-mediated Walker breakdown in ferromagnetic strips
• Magnetic non-contact friction from domain wall dynamics actuated by oscillatory mechanical motion
• Unidirectional tilt of domain walls in equilibrium in biaxial stripes with Dzyaloshinskii-Moriya interaction
• Field-driven side-by-side magnetic domain wall dynamics in ferromagnetic nanostrips