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Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO

DOI: 10.1103/PhysRevLett.124.217201 DOI Help

Authors: Maciej Dabrowski (University of Exeter) , Takafumi Nakano (University of Exeter) , David Burn (Diamond Light Source) , Andreas Frisk (Diamond Light Source) , David G. Newman (University of Exeter) , Christoph Klewe (University of Bielefeld) , Qian Li (University of California at Berkeley) , Mengmeng Yang (University of California at Berkeley) , Padraic Shafer (Advanced Light Source) , Elke Arenholz (Advanced Light Source) , Thorsten Hesjedal (University of Oxford) , Gerrit Van Der Laan (Diamond Light Source) , Zi Q. Qiu (University of California at Berkeley) , Robert J. Hicken (University of Exeter)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 124 , PAGES 217201

State: Published (Approved)
Published: May 2020
Diamond Proposal Number(s): 17745 , 19116 , 20760

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.

Journal Keywords: Dynamic spin injection; Magnetization dynamics; Magnons; Spin current; Spin dynamics; Spin transfer torque; Spin waves

Subject Areas: Materials, Physics, Information and Communication Technology

Diamond Offline Facilities: Magnetic Spectroscopy Lab
Instruments: I10-Beamline for Advanced Dichroism

Other Facilities: Advanced Light Source