Spin-wave amplification and lasing driven by inhomogeneous spin transfer torques
arXiv:1807.07312 · doi:10.1103/PhysRevLett.122.037203
Abstract
We show that an inhomogeneity in the spin-transfer torques in a metallic ferromagnet under suitable conditions strongly amplifies incoming spin waves. Moreover, at nonzero temperatures the incoming thermally occupied spin waves will be amplified such that the region with inhomogeneous spin transfer torques emits spin waves spontaneously, thus constituting a spin-wave laser. We determine the spin-wave scattering amplitudes for a simplified model and set-up, and show under which conditions the amplification and lasing occurs. Our results are interpreted in terms of a so-called black-hole laser, and could facilitate the field of magnonics, that aims to utilize spin waves in logic and data-processing devices.
arXiv comment5 pages, 4 figures
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- Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
- Green's function formalism for nonlocal elliptical magnon transport
- Magnonics along the wall in Bimeron Chain Domain Walls
- Instability of magnetic skyrmion strings induced by longitudinal spin currents
- Dynamically stable negative-energy states induced by spin-transfer torques
- Quantized Toroidal Waves on Ferrotoroidal Magnets