Second-order magnetization precession in an anisotropic medium. Part 1: Uniaxial anisotropy

A second-order precession of the magnetization vector in a normally magnetized magnetic plate with a uniaxial anisotropy whose axis is tilted at an angle to the plate normal is considered. Under the conditions for the orientational transition, precession pattern of the forced oscillation in the form of a large ring filled, along the ring generator, with small rings is obtained. A relationship between the observed crowding and sparseness of small rings and the tilt of the anisotropy axis to the normal to the plate plane is established and explained on the basis of the potential-energy model. It is shown that the crowding and sparseness can be compensated by a constant transverse field. It has been found that the phenomenon is critically sensitive to the axis orientation and to the value of the anisotropy constant as well as to the strength of the constant field. It is indicated that the observed phenomena can be put to practical use.