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SUMMARY:Control of spin current in a canted antiferromagnet - Prof. Haimin
 g Yu (Beihang)
DTSTART:20250710T130000Z
DTEND:20250710T141500Z
UID:TALK233947@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Controlling the spin current lies at the heart of spintronics 
 and its applications. In ferromagnets\, the sign of spin currents is fixed
  once the current direction is determined. However\, spin currents in anti
 ferromagnets can possess opposite polarizations\, but this requires enormo
 us magnetic fields to lift the degeneracy between the two modes. Therefore
 \, controlling spin currents with opposite polarization is still a challen
 ge. In this talk\, I will present our recent work on demonstrating the con
 trol of spin currents at room temperature by magnon interference in a cant
 ed antiferromagnet\, hematite\, that has recently been classified as an al
 termagnet. Magneto-optical characterization by Brillouin light scattering 
 reveals that the spatial periodicity of the beating patterns is tunable vi
 a the microwave frequency. We further observe that the inverse spin Hall v
 oltage changes sign as the frequency is tuned\, evincing a frequency-contr
 olled switching of polarization of pure spin currents. Our work highlights
  the use of antiferromagnetic magnon interference to control spin currents
 \, which substantially extends the horizon for the emerging field of coher
 ent antiferromagnetic spintronics.
LOCATION:Seminar Room 3\, RDC
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