Plasmon transport phenomena on a continuous ferromagnetic surfaceD. M. Newman1, M. L. Wears1 and R. J. Matelon2
1 School of Engineering and Computer Science, University of Exeter Exeter, EX4 4QF, UK
2 Facultad de Física, Pontificia Universidad Católica de Chile - Santiago, Chile
received 1 July 2004; accepted in final form 12 October 2004
published online 5 November 2004
Evidence is presented showing the transport properties of surface plasmons sensitive to the magnetization of the surface on which they are traveling. A magneto-plasmon interaction linear in sample magnetization is recorded for plasmons propagating on a continuous nickel surface when an applied field drives the magnetization along a direction within the surface transverse to the plasmon flux. No corresponding interaction is detectable when the field is applied co-linear with the direction of propagation. The phenomenon is observed as a variation in the far-field intensity of a well-directed beam of optical radiation observed emanating from the surface that is demonstrated to originate from plasmons re-coupling into the adjacent medium (air).
73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density excitations).
78.20.Ls - Magnetooptical effects.
42.79.Dj - Gratings.
© EDP Sciences 2004