Surface-induced reduction of the switching field in nanomagnets

Abstract

Magnetization reversal in a many-spin nanomagnet subjected to an rf magnetic field, on top of a DC magnetic field, is studied by numerically solving the system of coupled (damped) Landau-Lifshitz equations. It is demonstrated that spin-misalignment induced by surface anisotropy favors switching with a DC magnetic field weaker than the Stoner-Wohlfarth switching field, for optimal intensities and frequencies of the rf field.

arXiv comment7 pages, 6 figures

References in corpus (19)

• Switching of magnetization by non-linear resonance studied in single nanoparticles
• Finite-Size and surface effects in maghemite nanoparticles: Monte Carlo simulations
• Surface contribution to the anisotropy of magnetic nanoparticles
• Effective anisotropies and energy barriers of magnetic nanoparticles with Neel surface anisotropy
• Hysteretic properties of a magnetic particle with strong surface anisotropy
• Magnetization reversal through synchronization with a microwave
• Surface-induced cubic anisotropy in nanomagnets
• Magnetization of nanoparticle systems in a rotating magnetic field
• Nonlinear spin relaxation in strongly nonequilibrium magnets
• Optimal switching of a nanomagnet assisted by microwaves
• Effects of spin non-collinearities in magnetic nanoparticles
• Magnetization reversal via internal spin waves in magnetic nanoparticles
• Microwave-assisted switching of a nanomagnet: analytical determination of the optimal microwave field
• Magnetization switching by current and microwaves
• Coherent spin relaxation in molecular magnets
• Unified decoupling scheme for exchange and anisotropy contributions and temperature-dependent spectral properties of anisotropic spin systems
• Effect of exchange interaction on superparamagnetic relaxation
• Magnetization reversal and nonexponential relaxation via instabilities of internal spin waves in nanomagnets
• Dynamics of a nanoparticle as a one-spin system and beyond