DOMAIN-WALL RESONANCE IN GA SUBSTITUTED MAGNETOPLUMBITE

DWR in thin plates of the hexaferrite PbFe//1//2// minus //xGa//xO//1//9 for x equals 0,1 and 2 was measured with in-plane magnetic field, H//p, up to 13 kG. As the stripe period is smaller than thickness, the DWR frequency can be simply expressed analytically as a function of thickness, magnetization M, exchange constant, and uniaxial anisotropy energy. The dependence on H//p is incorporated in the dependence of the effective mass, z-component of magnetization M//z, and the wall energy on H//p. Very good agreement is obtained for both zero field resonance frequency (0. 4 to 1. 0 GHz) and the dependence of frequency on H//p.