An Intrinsic Spin Orbit Torque Nano-Oscillator

Abstract

Spin torque and spin Hall effect nanooscillators generate high intensity spin wave auto oscillations on the nanoscale enabling novel microwave applications in spintronics, magnonics, and neuromorphic computing. For their operation, these devices require externally generated spin currents either from an additional ferromagnetic layer or a material with a high spin Hall angle. Here we demonstrate highly coherent field and current tunable microwave signals from nanoconstrictions in single 15 and 20 nm thick permalloy layers. Using a combination of spin torque ferromagnetic resonance measurements, scanning microBrillouin light scattering microscopy, and micromagnetic simulations, we identify the autooscillations as emanating from a localized edge mode of the nanoconstriction driven by spin orbit torques. Our results pave the way for greatly simplified designs of auto oscillating nanomagnetic systems only requiring a single ferromagnetic layer.

arXiv comment11 pages, 2 figures

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Cited by in corpus (25)

• Roadmap on Spin-Wave Computing
• Planar Hall driven torque in a FM/NM/FM system
• Unidirectional orbital magnetoresistance in light metal/ferromagnet bilayers
• Enhancement of perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction in thin ferromagnetic films by atomic-scale modulation of interfaces
• Fabrication of voltage gated spin Hall nano-oscillators
• Energy-efficient W${}_{\text{100-x}}$Ta${}_{\text{x}}$/CoFeB/MgO spin Hall nano-oscillators
• Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling
• Hybrid spin Hall nano-oscillators based on ferromagnetic metal/ferrimagnetic insulator heterostructures
• Highly Tunable Spin-Orbit Torque and Anisotropic Magnetoresistance in a Topological Insulator Thin Film Attached to Ferromagnetic Layer
• Compositional effect on auto-oscillation behavior of Ni100-xFex/Pt spin Hall nano-oscillators
• Barkhausen noise from formation of 360${}^{\circ }$ domain walls in disordered permalloy thin films
• Single-layer spin-orbit-torque magnetization switching due to spin Berry curvature generated by minute spontaneous atomic displacement in a Weyl oxide
• Easy-plane spin Hall oscillator
• Origin of Nonlinear Damping due to Mode Coupling in Auto-Oscillatory Modes Strongly Driven by Spin-Orbit Torque
• Self-induced spin-orbit torques in metallic ferromagnets
• Phase noise analysis of mutually synchronized spin Hall nano-oscillators
• Level attraction and exceptional points in a resonant spin-orbit torque system
• Ultra-low-current-density single-layer magnetic Weyl semimetal spin Hall nano-oscillators
• Temperature-Dependent Anisotropic Magnetoresistance and Spin-Torque-Driven Vortex Dynamics in a Single Microdisk
• Voltage-Controlled High-Bandwidth Terahertz Oscillators Based On Antiferromagnets
• Spin wave excitations in a nanowire spin-torque oscillator with perpendicular magnetic anisotropy
• Time-domain imaging of curling modes in a confined magnetic vortex and a micromagnetic study exploring the role of spiral spin waves emitted by the core
• Spin orbit torque nano-oscillators by dipole field-localized spin wave modes
• Effects of Interfacial Oxygen Diffusion on the Magnetic Properties and Thermal Stability of Pd/CoFeB/Pd/Ta Heterostructure
• Mutual synchronization in spin torque and spin Hall nano-oscillators