TY - JOUR
T1 - Light scattering by magnons in whispering gallery mode cavities
AU - Sharma, Sanchar
AU - Blanter, Yaroslav M.
AU - Bauer, Gerrit E.W.
PY - 2017/9/12
Y1 - 2017/9/12
N2 - Brillouin light scattering is an established technique to study magnons, the elementary excitations of a magnet. Its efficiency can be enhanced by cavities that concentrate the light intensity. Here, we theoretically study inelastic scattering of photons by a magnetic sphere that supports optical whispering gallery modes in a plane normal to the magnetization. Magnons with low angular momenta scatter the light in the forward direction with a pronounced asymmetry in the Stokes and the anti-Stokes scattering strength, consistent with earlier studies. Magnons with large angular momenta constitute Damon-Eschbach modes which are shown to inelastically reflect light. The reflection spectrum contains either a Stokes or anti-Stokes peak, depending on the direction of the magnetization, a selection rule that can be explained by the chirality of the Damon-Eshbach magnons. The controllable energy transfer can be used to manage the thermodynamics of the magnet by light.
AB - Brillouin light scattering is an established technique to study magnons, the elementary excitations of a magnet. Its efficiency can be enhanced by cavities that concentrate the light intensity. Here, we theoretically study inelastic scattering of photons by a magnetic sphere that supports optical whispering gallery modes in a plane normal to the magnetization. Magnons with low angular momenta scatter the light in the forward direction with a pronounced asymmetry in the Stokes and the anti-Stokes scattering strength, consistent with earlier studies. Magnons with large angular momenta constitute Damon-Eschbach modes which are shown to inelastically reflect light. The reflection spectrum contains either a Stokes or anti-Stokes peak, depending on the direction of the magnetization, a selection rule that can be explained by the chirality of the Damon-Eshbach magnons. The controllable energy transfer can be used to manage the thermodynamics of the magnet by light.
UR - http://resolver.tudelft.nl/uuid:943ddda9-3847-4290-a3c2-5802d0f052cb
UR - http://www.scopus.com/inward/record.url?scp=85029952608&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.96.094412
DO - 10.1103/PhysRevB.96.094412
M3 - Article
AN - SCOPUS:85029952608
SN - 2469-9950
VL - 96
JO - Physical Review X
JF - Physical Review X
IS - 9
M1 - 094412
ER -