Large angle precession of magnetization maintained by a microwave voltage

Abstract

Effects of a microwave voltage on magnetization precession are analyzed based on a macrospin model. The microwave voltage induces the oscillating anisotropy field through the voltage controlled magnetic anisotropy (VCMA) effect, and then stimulates the magnetization. The large angle precession is maintained if the magnetization synchronizes with the microwave voltage. The effective equations of motion of the magnetization with an oscillating anisotropy field are derived, and the mechanism of the synchronization is clarified by analyzing the derived equations of motion. The conditions of the angular frequency detuning and the amplitude of the oscillating anisotropy field for synchronization are obtained. The results are useful for development of the VCMA-based energy-efficient spintronics devices using magnetization precession such as a VCMA-based magnetoresistive random access memory and a nano-scale microwave magnetic field generator.

7 pages, 5 figures

References in corpus (5)

• Surface Magnetoelectric Effect in Ferromagnetic Metal Films
• Parametric resonance of magnetization excited by electric field
• Resonant Spin-Transfer-Driven Switching of Magnetic Devices Assisted by Microwave Current Pulses
• Voltage-induced precessional switching at zero-bias magnetic field in a conically magnetized free layer
• Resonant Magnetization Switching Conditions of an Exchange-coupled Bilayer under Spin Wave Excitation