Magnetization reversal condition for a nanomagnet within a rotating magnetic field

Abstract

The reversal condition of magnetization in a nanomagnet under the effect of rotating magnetic field generated by a microwave is theoretically studied based on the Landau-Lifshitz-Gilbert equation. In a rotating frame, the microwave produces a dc magnetic field pointing in the reversed direction, which energetically stabilizes the reversed state. We find that the microwave simultaneously produces a torque preventing the reversal. It is pointed out that this torque leads to a jump in the reversal field with respect to the frequency. We derive the equations determining the reversal fields in both the low- and high-frequency regions from the energy balance equation. The validities of the formulas are confirmed by a comparison with the numerical simulation of the Landau-Lifshitz-Gilbert equation.

arXiv comment9 pages, 7 figures

References in corpus (18)

• Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
• Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
• Mechanisms of spin-polarized current-driven magnetization switching
• Switching of magnetization by non-linear resonance studied in single nanoparticles
• Magnetization reversal through synchronization with a microwave
• Dynamical and thermal effects in nanoparticle systems driven by a rotating magnetic field
• Tensor form of magnetization damping
• Thermally-Assisted Spin-Transfer Torque Dynamics in Energy Space
• Spin torque switching of an in-plane magnetized system in a thermally activated region
• Reversal of magnetization of a single-domain magnetic particle by the ac field of time-dependent frequency
• Optimal switching of a nanomagnet assisted by microwaves
• Critical current of spin transfer torque-driven magnetization dynamics in magnetic multilayers
• Averaged equation for energy diffusion on a graph reveals bifurcation diagram and thermally assisted reversal times in spin-torque driven nanomagnets
• Microwave-assisted switching of a nanomagnet: analytical determination of the optimal microwave field
• Thermally activated switching rate of a nanomagnet in the presence of spin torque
• Current Dependence of Spin Torque Switching Barrier
• Current dependence of spin torque switching rate based on Fokker-Planck approach
• Dependence of critical current of spin transfer torque-driven magnetization dynamics on free layer thickness

Cited by in corpus (13)

• Instability analysis of spin torque oscillator with an in-plane magnetized free layer and a perpendicularly magnetized pinned layer
• An analytical computation of magnetic field generated from a cylinder ferromagnet
• Magnetization switching by current and microwaves
• Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers
• Dynamic coupling of ferromagnets via spin Hall magnetoresistance
• Magnetization switching by microwaves synchronized in the vicinity of precession frequency
• Spin torque oscillator for microwave assisted magnetization reversal
• Stability of a Magnetically Levitated Nanomagnet in Vacuum: Effects of Gas and Magnetization Damping
• Phase locking in voltage-controlled parametric oscillator
• Chaotic magnetization dynamics driven by feedback magnetic field
• Magnetization switching by microwaves initially rotating in opposite direction to precession
• Transition state theory characterizes thin film macrospin dynamics driven by an oscillatory magnetic field: Inertial effects
• Transition state dynamics of a driven magnetic free layer