Low field microwave excitations of magnetic domain walls

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Abstract
A theory is proposed to account for the frequency dependence of the low field absorption of microwave energy by magnetic garnet films containing a stripe domain structure. Considering only the uniaxial anisotropy field Hu and the demagnetization energy a Schrödinger like equation for the r.f. magnetization has been developed. Unbound states, for ω/γHu≳1, develop a net moment across a domain wall which couples in a non‐resonant manner to an r.f. magnetic field. The frequency dependence of this coupling is calculated by box normalizing the solutions of the Schrödinger like equation. The ratio of this magnetic moment to the r.f. moment of the uniform mode is calculated and observed to be in good agreement with the experimental results.