Spin-wave amplification and lasing driven by inhomogeneous spin-transfer torques

R.J. Doornenbal, A. Roldán-Molina, A.S. Nunez, R.A. Duine

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)
118 Downloads (Pure)


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 setup, 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, which aims to utilize spin waves in logic and data-processing devices.

Original languageEnglish
Article number037203
Number of pages5
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 25 Jan 2019


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