Critical Field of Spin Torque Oscillator with Perpendicularly Magnetized Free Layer

Abstract

The oscillation properties of a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnetized pinned layer are studied based on an analysis of the energy balance between spin torque and damping. The critical value of an external magnetic field applied normal to the film plane is found, below which the controllable range of the oscillation frequency by the current is suppressed. The value of the critical field depends on the magnetic anisotropy, the saturation magnetization, and the spin torque parameter.

5 pages, 4 figures

References in corpus (2)

• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Spin torque switching of an in-plane magnetized system in a thermally activated region

Cited by in corpus (16)

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• Synchronization and chaos in a spin-torque oscillator with a perpendicularly magnetized free layer
• Magnetization switching by current and microwaves
• Nonlinear analysis of magnetization dynamics excited by spin Hall effect
• Relaxation time and critical slowing down of a spin-torque oscillator
• Stable oscillation in spin torque oscillator excited by a small in-plane magnetic field
• Large amplitude oscillation of magnetization in spin-torque oscillator stabilized by field-like torque
• Influence of field-like torque in synchronization of spin torque oscillators
• Layer-selective detection of magnetization directions from two layers of antiferromagnetically-coupled magnetizations by ferromagnetic resonance using a spin-torque oscillator
• Zero-field dynamics stabilized by in-plane shape anisotropy in MgO-based spin-torque oscillators
• Current-driven magnetization dynamics and their correlation with magnetization configurations in perpendicularly magnetized tunnel junctions
• Spin-transfer dynamics in MgO-based magnetic tunnel junctions with an out-of-plane magnetized free layer and an in-plane polarizer
• Role of Magnetic Field in Self-Oscillation of Nanomagnet Excited by Spin Torque
• Switching based Spin Transfer Torque Oscillator with zero-bias field and large tuning-ratio