Breaking Space Inversion-Symmetry to Obtain Asymmetric Spin-Wave Excitation in Systems with Nonuniform Magnetic Exchange
arXiv:2012.10381 · doi:10.1002/aelm.202100435
Abstract
We report on the consequences of non-uniform exchange in magnetic systems. The quantum mechanical exchange interaction between spins is responsible for the phenomenon of magnetic order, and is generally considered to be uniform across bulk magnetic systems. Partly inspired by the Dzyaloshinskii-Moriya interaction--also known as antisymmetric exchange--we use a linearly varying exchange interaction along a magnetic strip as a route to spatial inversion symmetry-breaking. We find that, in addition to asymmetric modes and localization, spatially-varying exchange can be used to design nonreciprocal magnetic signal excitation at frequencies that are tunable. Moreover, our work predicts nonreciprocity to occur across a vast range of frequencies up to hundreds of GHz. Such spin wave engineering is a key area of ongoing research in the fields of magnonics and spintronics, which are expected to enable the next generation of communication technology. Analogous nonreciprocity is expected to occur in other wave systems with gradient properties.
References in corpus (19)
- Magnonic crystals for data processing
- Ultra-low magnetic damping of a metallic ferromagnet
- Spin-Wave Propagation in the Presence of Interfacial Dzyaloshinskii-Moriya Interaction
- An Introduction to Spin Wave Computing
- Asymmetric Spin-wave Dispersion on Fe(110): Direct Evidence of Dzyaloshinskii--Moriya Interaction
- Observation of nonreciprocal wave propagation in a dynamic phononic lattice
- Nonreciprocal Transmission of Microwave Acoustic Waves in Nonlinear Parity-Time Symmetric Resonators
- Phonon Angular Momentum Induced by Temperature Gradient
- Chiral spin-wave velocities induced by all-garnet interfacial Dzyaloshinskii-Moriya interaction in ultrathin yttrium iron garnet films
- Nonreciprocal spin-wave channeling along textures driven by the Dzyaloshinskii-Moriya interaction
- Experimental Observation of Nonreciprocal Waves in a Resonant Metamaterial Beam
- All electrical propagating spin wave spectroscopy with broadband wavevector capability
- A micro-structured ion-implanted magnonic crystal
- Interface boundary conditions for dynamic magnetization and spin wave dynamics in a ferromagnetic layer with the interface Dzyaloshinskii-Moriya interaction
- Spin wave power flow and caustics in ultrathin ferromagnets with the Dzyaloshinskii-Moriya interaction
- Determination of exchange constants of Heusler compounds by Brillouin light scattering spectroscopy: application to CoMnSi
- The Unusual Nature of Confined Modes in a Chiral System
- Asymmetric spin wave dispersion due to a saturation magnetization gradient
- A semi-analytical approach to calculating the dynamic modes of magnetic vortices with Dzyaloshinskii-Moriya interactions