Easy-plane spin Hall oscillator
arXiv:2301.09228 · doi:10.1038/s42005-023-01298-7
Abstract
Spin Hall oscillators (SHOs) based on bilayers of a ferromagnet (FM) and a non-magnetic heavy metal (HM) are electrically tunable nanoscale microwave signal generators. Achieving high output power in SHOs requires driving large-amplitude magnetization dynamics by a direct spin Hall current. The maximum possible amplitude of such oscillations with the precession cone angle nearing is predicted for FM layers with easy-plane magnetic anisotropy and spin Hall current polarization perpendicular to the easy plane. While many FMs exhibit natural easy-plane anisotropy in the FM film plane, the spin Hall current in a HM|FM bilayer is polarized in this plane and thus cannot drive large-amplitude magneto-dynamics. Here we present a new type of SHO engineered to have the easy-plane anisotropy oriented normal to the film plane, enabling large-amplitude easy-plane dynamics driven by spin Hall current. Our experiments and micromagnetic simulations demonstrate that the desired easy-plane anisotropy can be achieved by tuning the magnetic shape anisotropy and perpendicular magnetic anisotropy in a nanowire SHO, leading to a significant enhancement of the generated microwave power. The easy-plane SHO experimentally demonstrated here is an ideal candidate for realization of a spintronic spiking neuron. Our results provide a new approach to design of high-power SHOs for wireless communications, neuromorphic computing, and microwave assisted magnetic recording.
arXiv commentMain: 12 pages, 6 figures. Supplementary Material: 5 pages, 6 figures
References in corpus (43)
- Spin torque switching with the giant spin Hall effect of tantalum
- The design and verification of Mumax3
- Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
- Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
- Magnetic vortex oscillator driven by dc spin-polarized current
- Roadmap on Spin-Wave Computing
- Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
- Spin Hall magnetoresistance in metallic bilayers
- Time- and spatially-resolved magnetization dynamics driven by spin-orbit torques
- Spin currents and spin superfluidity
- Field-free spin-orbit torque-induced switching of perpendicular magnetization in a ferrimagnetic layer with vertical composition gradient
- Nanowire Spin Torque Oscillator Driven by Spin Orbit Torques
- Superfluid Spin Transport through Easy-Plane Ferromagnetic Insulators
- Experimental Signatures of Spin Superfluid Ground State in Canted Antiferromagnet Cr2O3 via Nonlocal Spin Transport
- Spin Transfer Dynamics in Spin Valves with Out-of-plane Magnetized CoNi Free Layers
- Current-Induced Nanomagnet Dynamics for Magnetic Fields Perpendicular to the Sample Plane
- Planar Hall torque
- Memristive control of mutual SHNO synchronization for neuromorphic computing
- An Intrinsic Spin Orbit Torque Nano-Oscillator
- Determination of spin Hall effect and spin diffusion length of Pt from self-consistent fitting of damping enhancement and inverse spin-orbit torque measurements
- Stable Magnetic Droplet Solitons in Spin Transfer Nanocontacts
- Long-Distance Spin Transport Through a Graphene Quantum Hall Antiferromagnet
- Spin-Orbit Torque Induced Spike-Timing Dependent Plasticity
- Spin-orbit-torque magnonics
- Unveiling the mechanisms of the spin Hall effect in Ta
- Low Barrier Magnet Design for Efficient Hardware Binary Stochastic Neurons
- Spin-Hall Nano-oscillator: a micromagnetic study
- Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques
- Controlled nonlinear magnetic damping in spin-Hall nano-devices
- Giant resonant nonlinear damping in nanoscale ferromagnets
- Spin-orbit torque based physical unclonable function
- Chaos in Magnetic Nanocontact Vortex Oscillators
- Non-Hermitian topology of one-dimensional spin-torque oscillator arrays
- Width dependent auto-oscillating properties of constriction based spin Hall nano-oscillators
- Easy-plane spin Hall nano-oscillators as spiking neurons for neuromorphic computing
- Spin-torque oscillation in a magnetic insulator probed by a single-spin sensor
- Chaos and relaxation oscillations in spin-torque windmill neurons
- Dynamics of thin-film spin-flip transistors with perpendicular source-drain magnetizations
- Bipolar spin Hall nano-oscillators
- Dimensional crossover in spin Hall oscillators
- Self-stabilizing exchange-mediated spin transport
- Origin of Nonlinear Damping due to Mode Coupling in Auto-Oscillatory Modes Strongly Driven by Spin-Orbit Torque
- Parametric resonance of spin waves in ferromagnetic nanowires tuned by spin Hall torque