Theory of non-linear longitudinal Kerr magneto-optic effect in a ferromagnetic metallic thin film

Includes bibliographical references (page 57)A theory of the non-linear longitudinal Kerr magneto-optic effect, previously developed for bulk materials, is now applied to a magnetic thin film. The material model is based on the classical equation of motion for a free electron with a finite relaxation frequency under the action of a Lorentz force. A second harmonic current density, dependent upon three non-linear conductivity tensors, reduces to results obtained by Jha in the limit of vanishing ferromagnetic state. The second harmonic reflection coefficients are approximated and are given in terms of the first harmonic reflection coefficients as derived by Smith