Separation of interface and bulk contributions in second-harmonic generation from magnetic and non-magnetic multilayers |
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| Authors: | B. Koopmans A. M. Janner H. A. Wierenga Th. Rasing G. A. Sawatzky F. van der Woude |
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| Affiliation: | (1) Research Institute for Materials, Toernooiveld, 6525 ED Nijmegen, The Netherlands;(2) Laboratory of Solid State Physics, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;(3) Present address: Max-Planck Institut für Festkörperforschung, D-70506 Stuttgart, Germany |
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| Abstract: | We discuss the separation problem of bulk vs interface contributions in optical Second-Harmonic Generation (SHG). A new method is presented, which — in special cases — provides a full separation of all interface and bulk tensor components. The method is based on measurements in a thin-film geometry, and the relation between two bulk tensor components obtained from group-theoretical arguments. The separation problem in its strict sense is shown to be absent in Magnetization-induced SHG (MSHG). Though, in practice, also in the MSHG case interface and bulk contributions can be closely resemblant. The approach is illustrated by second-harmonic experiments on C60 thin films. SHG in this system is found to be completely dominated by bulk processes.Paper presented at the 129th WE-Heraeus-Seminar on  Surface Studies by Nonlinear Laser Spectroscopies , Kassel, Germany, May 30 to June 1, 1994 |
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| Keywords: | 42.65.Ky 75.70.Cn 78.66.-w |
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