The concept of the existence of interfacial superparamagnetic entities in Fe/Cr multilayers

Lucinski T, Elefant D, Reiss G, Verges P. The concept of the existence of interfacial superparamagnetic entities in Fe/Cr multilayers. Journal of Magnetism and Magnetic Materials. 1996;162(1):29-37.Giant magnetoresistance effects and their field dependence in Fe/Cr multilayer films prepared by rf magnetron sputtering have been modelled using the concept of the existence of paramagnetic regions at the Fe/Cr interfaces. The model has been applied to as-deposited and annealed samples with the result that the approximate sizes of superparamagnetic entities at the interfaces (or their magnetic moment) could be determined. The variation of the magnetoresistivity was studied as a function of annealing temperature. It has been demonstrated experimentally that the magnetoresistance follows the square of the magnetisation dependence for Fe/Cr multilayers