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Phys. Rev. B 54 (1996) pp. R2343-R2346

Effects of interface magnetic moments and quantum-well states on magnetisation-induced second harmonic generation

P. van Gelderen

Research Institute for Materials, University of Nijmegen, Toernooiveld, NL-6525 ED Nijmegen, The Netherlands

S. Crampin

School of Physics, University of Bath, BA2 7AY, United Kingdom

Th. Rasing and J.E. Inglesfield

Research Institute for Materials, University of Nijmegen, Toernooiveld, NL-6525 ED Nijmegen, The Netherlands

Abstract
We develop a model for magnetisation-induced second-harmonic-generation (MSHG) experiments on Co/Cu(001) and Cu/Co(001) overlayers by expanding the nonlinear optical susceptibility to lowest order in the magnetisation, and taking the latter to be given by the interface moments from ab-initio electronic-structure calculations. The model accounts well for the relative MSHG signal from Co/Cu(001), but contrary to experiment predicts a nearly constant signal for Cu/Co(001). We discuss the possibility of quantum-well states accounting for the failure in the latter case.