High Frequency Microwave Emission of a Tri-layer Magnetic Tunnel Junction in the Absence of External Bias-Magnetic Field
arXiv:2001.04539 · doi:10.1103/PhysRevApplied.14.014040
Abstract
We perform an experimental study of DC current induced microwave emission in a magnetic tunnel junction (MTJ) consisting of three active magnetic layers. For this tri-layer structure, in addition to a conventional bilayer orthogonal MTJ containing a perpendicular free layer and an in-plane fixed layer, a second perpendicular layer has been introduced. We found that the microwave emission frequency induced by spin-transfer torque (STT) can reach as high as 6 GHz in the absence of any applied magnetic field. Moreover, microwave emission is observed for both current polarizations where a redshift is seen with increase in magnitude of current. We discuss spin-dynamics of the observed bi-directional high-frequency emission and the physical origin of the red-shift. The distinct microwave emission properties exhibited in this tri-layer MTJ structure could potentially be useful for future applications in nanoscale spintronics devices such as microwave communication and neuromorphic computing.
arXiv commentmanuscript and supporting information together
References in corpus (20)
- The design and verification of Mumax3
- Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
- Theory of Current-Driven Domain Wall Motion: A Poorman's Approach
- Vowel recognition with four coupled spin-torque nano-oscillators
- Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
- Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions
- The 2014 Magnetism Roadmap
- Ultralow-current-density and bias-field-free spin-transfer nano-oscillator
- Spin transfer nano-oscillators
- Giant spin-torque diode sensitivity at low input power in the absence of bias magnetic field
- Low-Energy Truly Random Number Generation with Superparamagnetic Tunnel Junctions for Unconventional Computing
- Shaped angular dependence of the spin transfer torque and microwave generation without magnetic field
- Origin of interfacial perpendicular magnetic anisotropy in MgO/CoFe/metallic capping layer structures
- Microwave power generated by a spin-torque oscillator in the presence of noise
- Understanding of phase noise squeezing under fractional synchronization of non-linear spin transfer vortex oscillator
- Bias dependence of perpendicular spin torque and of free and fixed layer eigenmodes in MgO-based nanopillars
- Spin transfer torque oscillator based on asymmetric magnetic tunnel junctions
- Coherent microwave generation by spintronic feedback oscillator
- Self-Oscillation in Spin Torque Oscillator Stabilized by Field-like Torque
- Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions