Abstract
The general form for the magnetic resonance frequency ω of anisotropic ferromagnets as derived from the free energy F by Smit and Beljers (ω/γ=(M sinθ(-), although numerically correct, is physically not convenient, because the origin of the different terms in F is obscured by an angular-dependent mixing. This mixing is avoided by using the relation (ω/γ=1/ [( /θ+cosθ/sinθ)-(/sinθ-cosθ/sinθ /sinθ]. .sp Explicit expressions will show the symmetry of each of the terms in F for all magnitudes and directions of H. In addition, an alternate method which uses only rectangular coordinates and which can easily be generalized for multisublattice systems is described.
- Received 1 October 1987
DOI:https://doi.org/10.1103/PhysRevB.38.2237
©1988 American Physical Society