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.

9 pages, 7 figures

References in corpus (3)

• Spin torque switching of an in-plane magnetized system in a thermally activated region
• Critical current of spin transfer torque-driven magnetization dynamics in magnetic multilayers
• Dependence of critical current of spin transfer torque-driven magnetization dynamics on free layer thickness

Cited by in corpus (6)

• Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers
• Dynamic coupling of ferromagnets via spin Hall magnetoresistance
• Phase locking in voltage-controlled parametric oscillator
• Chaotic magnetization dynamics driven by feedback magnetic field
• 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