Abstract
Magnetization induced second harmonic generation (MSHG) is a new nonlinear magneto-optical technique that combines interface sensitivity with huge magneto-optical effects. These effects are due to the simultaneous breaking of inversion symmetry (at. interfaces) and time-reversal symmetry (by the magnetization). The higher-order nonlinear optical tensor is also responsible for the appearance of essentially new magneto-optical effects that have no equivalent in the linear case. Because most magnetically ordered materials are centrosymmetric in their bulk form, MSHG is a particularly useful probe to study the magnetic properties of the interfaces in magnetic multilayer systems, that are used for recording as well as sensor materials. In this paper, I will give a brief introduction and overview of this novel nonlinear magneto-optical technique, and discuss some recent advances in this field. In particular the possibilities to probe in-situ the magnetic and structural (changes in the) interface properties of magnetic multilayer sensor and recording materials will be illustrated.
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