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Magneto-optical determination of the in-depth magnetization profile in magnetic multilayers

Abstract : In this work, some open problems concerning the investigation and interpretation of magnetic properties of thin film metallic multilayers are treated by Magneto-Optics (MO). More precisely, the Magneto-Optical Kerr Effect (MOKE) and Magneto-Optical Second Harmonic Generation (MOSHG) of light are used to determine the properties of individual layers and interfaces. This thesis solves several problems: A new technique is proposed to separate the MOKE contributions, coming from ferromagnetic( FM)/non-FM interfaces and from the contributions of the FM layer themselves. This method is applied with success to study the Au/Co/Au(111) interfaces. It is shown how one can measure selectively the MOKE contributions coming only from one FM layer, canceling the contributions from the others. Firstly, a very usefull depth sensitivity function is introduced. Some previously proposed solutions for separating MOKE from a single FM layer in a FM bilayer structure are unified. For a system composed of several FM layers, two new techniques are introduced, the “Parallel Kerr vectors” and the “Cascade Numerical Projection”. For separating FM signals issued from individual FM layers, a simple procedure is proposed to determine the depth of a FM layer associated with a given MOKE component. A new type of MOKE effect has been discovered here. It is observed when a FM layer is grown on a vicinal surface, and it is called Vicinal-Induced Surface MOKE (VISMOKE). VISMOKE is linked to the in-plane magnetization and curiously exists even at zero angle of incidence (no MO effect linear in magnetization was expected before in this configuration). VISMOKE is evidenced and interpreted here for a Co layer deposited on a Au(322) vicinal surface. Up to now, there was no theory predicting which interface gives the larger MOSHG contribution in a multilayer structure. A new approach is introduced here, treating the MOSHG from the radiation of an ensemble of electric point dipoles located at interfaces. This allows to introduce the depth and the spatial distribution of radiating dipoles inside a non-isotropic structure. It is shown that the magnetic contrast in the pp-MOSHG configuration is always more sensitive to air/metal or dielectric/metal interfaces than to metal/metal interfaces.
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Submitted on : Wednesday, June 4, 2003 - 2:13:26 PM
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  • HAL Id : tel-00002948, version 1

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Jaroslav Hamrle. Magneto-optical determination of the in-depth magnetization profile in magnetic multilayers. Condensed Matter [cond-mat]. Université Paris Sud - Paris XI, 2003. English. ⟨tel-00002948⟩

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