Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points
arXiv:2108.04804 · doi:10.1038/s41467-023-44436-z
Abstract
The emergence of exceptional points (EPs) in the parameter space of a non-hermitian (2D) eigenvalue problem is studied in a general sense in mathematical physics, and has in the last decade successively reached the scope of experiments. In coupled systems, it gives rise to unique physical phenomena, which enable novel approaches for the development of seminal types of highly sensitive sensors. Here, we demonstrate at room temperature the emergence of EPs in coupled spintronic nanoscale oscillators and hence exploit the system's non-hermiticity. We describe the observation of amplitude death of self-oscillations and other complex dynamics, and develop a linearized non-hermitian model of the coupled spintronic system, which properly describes the main experimental features. Interestingly, these spintronic nanoscale oscillators are deployment-ready in different applicational technologies, such as field, current or rotation sensors, radiofrequeny and wireless devices and, more recently, novel neuromorphic hardware solutions. Their unique and versatile properties, notably their large nonlinear behavior, open up unprecedented perspectives in experiments as well as in theory on the physics of exceptional points. Furthermore, the exploitation of EPs in spintronics devises a new paradigm for ultrasensitive nanoscale sensors and the implementation of complex dynamics in the framework of non-conventional computing.
References in corpus (40)
- The physics of exceptional points
- Symmetry and Topology in Non-Hermitian Physics
- Dynamically encircling exceptional points in a waveguide: asymmetric mode switching from the breakdown of adiabaticity
- Topological energy transfer in an optomechanical system with exceptional points
- Spin torque building blocks
- Vowel recognition with four coupled spin-torque nano-oscillators
- Exceptional Points of Non-hermitian Operators
- Magnonic crystals for data processing
- Cavity Magnonics
- Observation of the exceptional point in cavity magnon-polaritons
- Repulsion of Resonance States and Exceptional Points
- Observation of an exceptional point in a chaotic optical microcavity
- The Chirality of Exceptional Points
- Observation of a Chiral State in a Microwave Cavity
- Unconventional Singularity in Anti-Parity-Time Symmetric Cavity Magnonics
- Observation of Exceptional Points in Electronic Circuits
- Ultrasensitive micro-scale parity-time-symmetric ring laser gyroscope
- Exceptional Points in Atomic Spectra
- Higher-order exceptional point in a cavity magnonics system
- Mutual synchronization of spin torque nano-oscillators through a non-local and tunable electrical coupling
- Non-Hermitian Localization in Biological Networks
- Spin torque resonant vortex core expulsion for an efficient radio-frequency detection scheme
- Topological Properties of a Coupled Spin-Photon System Induced by Damping
- Parity-time symmetry breaking in magnetic systems
- Enlarging the scope: grasping brain complexity
- Steering magnonic dynamics and permeability at exceptional points in a parity-time symmetric waveguide
- Higher-order exceptional points in all-magnetic structures
- Exceptional points in dissipatively coupled spin dynamics
- Frequency shift keying by current modulation in a MTJ-based STNO with high data rate
- Non-Hermitian topology of one-dimensional spin-torque oscillator arrays
- Low Power Microwave Signal Detection With a Spin-Torque Nano-Oscillator in the Active Self-Oscillating Regime
- Exceptional points in coupled dissipative dynamical systems
- Bistability in Two Simple Symmetrically Coupled Oscillators with Symmetry-broken Amplitude- and Phase-Locking
- Non-linear dynamics of the non-Hermitian Su-Schrieffer-Heeger model
- Dynamical phase diagram of parity-time symmetry with competing saturable channels
- Non-Hermitian Quasi-Localization and Ring Attractor Neural Networks
- Exceptional points as signatures of dynamical magnetic phase transitions
- Spin-torque Dynamics for Noise Reduction in Vortex-based Sensors
- Level attraction and exceptional points in a resonant spin-orbit torque system
- Multilayer spintronic neural networks with radio-frequency connections