Magneto-optical properties of Co|Pt multilayer systems

We are reporting, for the first time in the literature, theoretical Kerr spectra of Co|Pt multilayer systems as obtained on a first principles basis including multiple reflections and interferences from all the boundaries in-between the layers.Comment: 4 pages (LaTeX), 1 (a,b) figures (Encapsulated PostScript), J. Appl. Physics, in pres

Layer-resolved optical conductivity of Co|Pt multilayers

The complex optical conductivity tensor is calculated for the Co|Pt systems by applying a contour integration technique within the framework of the spin-polarized relativistic screened Korringa-Kohn-Rostoker method. It is shown that the optical conductivity of the Co|Pt multilayer systems is dominated by contributions arising from the Pt cap and/or substrate layers.Comment: 7 pages (LaTeX), 2 (a,b) figures (Encapsulated PostScript), J. Magn. Magn. Materials, in pres

Reorientation phase transitions in thin magnetic films: a review of the classical vector spin model within the mean field approach

The ground state and the finite temperature phase diagrams with respect to magnetic configurations are studied systematically for thin magnetic films in terms of a classical Heisenberg model including magnetic dipole-dipole interaction and uniaxial anisotropy. Simple relations are derived for the occurrence of the various phase boundaries between the different regions of the magnetic orientations. In particular, the range of the first and second order reorientation phase transitions are determined for bi- and trilayers.Comment: 23 pages, LaTeX + 7 figures (Encapsulated PostScript), submitted to Philosophical Magazine B (Feb. 28, 2001

Le principe de Pascal-Hume et la métaphysique

Le raisonnement par lequel Hume établit l'ori- gine empirique de Vidée de cause repose implicitement sur un principe de possibilité a priori et même de probabilité a priori, dont Hume n'a pas remarqué le caractère rationnel, tant il paraissait naturel. Ce principe est identique à celui sur lequel Pascal fonde le calcul des probabilités. Si l'on admet sa légitimité, il en résulte deux conséquences capita- les pour la théorie de la connaissance : 1 - La raison ne se limite pas aux seuls principes logiques en oeuvre dans la déduction mais doit reconnaître que ce qui est également pensable est également probable a priori. 2 - Ce principe de probabilité fournit une preuve de l'existence d'une réalité extérieure à la conscience, que l'on cherchait en vain dans le principe de causalité.The reasoning by which Hume established the empirical origin of the idea of cause rests on a principle of a priori possibility and even a priori probability of which Hume did not notice the rational character, so natural did it seem. This principle is identical to the one on which Pascal founded the calculation of probabilities. If its legitimy is admitted, two important consequences follow for the theory of knowledge : 1 - Reason is not limited only to the logical principles at word in deduction but must recognize that, a priori, what is equally thinkable it equally probable. 2 - This principle of probability provides a proof of the existence of a reality outside the consciousness that one looked for in vain in the principle of causality