Abstract
Insulating antiferromagnets have recently emerged as efficient and robust conductors of spin current. Element-specific and phase-resolved x-ray ferromagnetic resonance has been used to probe the injection and transmission of ac spin current through thin epitaxial NiO(001) layers. The spin current is found to be mediated by coherent evanescent spin waves of GHz frequency, rather than propagating magnons of THz frequency, paving the way towards coherent control of the phase and amplitude of spin currents within an antiferromagnetic insulator at room temperature.
- Received 17 December 2019
- Accepted 6 April 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.217201
© 2020 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Spin Current in an Antiferromagnet is Coherent
Published 26 May 2020
Experiments show that a spin current moves as a coherent evanescent spin wave through an antiferromagnet layer sandwiched between two ferromagnets.
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