ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Using a microscopic and quantum approach, we study the ground state configuration and the spin-wave excitations of a model of two ferromagnetic monolayers, interacting via both bilinear and biquadratic exchange, and subject to an easy-plane anisotropy, a quartic in-plane anisotropy, and an external field. Peculiar features are found in the field dependence of the acoustic and optical frequency gaps in correspondence to the critical fields for which the canting angle between the magnetizations of the two coupled layers presents discontinuities. In particular, we suggest that a minimum in the optical gap at the saturation field could be experimentally observed by Brillouin light scattering in real systems, like Fe/Cr/Fe trilayers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.356952
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