[en] We calculate the dispersion relations for spin waves on a periodic chain of spherical or cylindrical Yttrium Iron Garnet (YIG) particles. We use the quasistatic approximation, appropriate when kd <<1, where k is the wave number and d the interparticle spacing. In this regime, because of the magnetic dipole-dipole interaction between the localized magnetic excitations on neighboring particles, dispersive spin waves can propagate along the chain. The waves are analogous to plasmonic waves generated by electric dipole-dipole interactions between plasmons on neighboring metallic particles. The spin waves can be longitudinal (L), transverse (T ), or elliptically polarized. We find that a linearly polarized spin wave undergoes a Faraday rotation as it propagates along the chain. The amount of Faraday rotation can be tuned by varying the off-diagonal component of the permeability tensor. We also discuss the possibility of wireless power transmission along the chain using these coupled spin waves.
Disciplines :
Physics
Author, co-author :
Pike, Nicholas ; Université de Liège > Département de physique > Physique des matériaux et nanostructures
Stroud, David
Language :
English
Title :
Spin waves on chains of YIG particles: dispersion relations, Faraday rotation, and power transmission
Publication date :
March 2017
Journal title :
European Physical Journal B -- Condensed Matter
ISSN :
1434-6028
eISSN :
1434-6036
Publisher :
Springer Science & Business Media B.V., New York, United States - New York
Volume :
90
Pages :
59
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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