Vortex Dynamics-Mediated Low-Field Magnetization Switching in an Exchange-Coupled System

Abstract

A magnetic vortex has attracted significant attention since it is a topologically stable magnetic structure in a soft magnetic nanodisk. Many studies have been devoted to understanding the nature of magnetic vortex in isolated systems. Here we show a new aspect of a magnetic vortex the dynamics of which strongly affects the magnetic structures of environment. We exploit a nanodot of an exchange-coupled bilayer with a soft magnetic Ni81Fe19 (permalloy; Py) having a magnetic vortex and a perpendicularly magnetized L10-FePt exhibiting a large switching field (Hsw). The vortex dynamics with azimuthal spin waves makes the excess energy accumulate in the Py, which triggers the reversed-domain nucleation in the L10-FePt at a low magnetic field. Our results shed light on the non-local mechanism of a reversed-domain nucleation, and provide with a route for efficient Hsw reduction that is needed for ultralow-power spintronic devices.

26 pages, 5 figures, Supplementary Information

References in corpus (4)

• The design and verification of Mumax3
• Magnetic Vortex Resonance in Patterned Ferromagnetic Dots
• Magnetic Vortex Core Reversal by Excitation of Spin Waves
• Current-driven resonant excitation of magnetic vortex

Cited by in corpus (3)

• Perpendicularly Magnetized Ni / Pt (001) Epitaxial Superlattice
• Resonant Magnetization Switching Conditions of an Exchange-coupled Bilayer under Spin Wave Excitation
• Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers