Theory of AF resonance

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  • Large body of work in '50s, theory by Keffer, Kittel and others
  • Fields in effective Hamiltonian (uniaxial anisotropy):
    Exchange (He), anisotropy (Ha), external (H0), excitation (Hrf)
  • Zero external field: 
  • Finite external field lifts degeneracy.
    Parallel to easy axis: two branches (circular polarization)

    • Perp to easy axis: one mode is independent of the external field (linear polariztion)

Date: 9/7/2004.
Created by László Mihály

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