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VOLUME 90 (2009) | ISSUE 1 | PAGE 64
Observation of the 'inverse' spin valve effect in a Ni/V/Ni trilayer system
PACS: 74.45.+c, 74.78.Fk, 75.50.Ee
Abstract
An experimental study of magnetic and superconducting properties of a trilayer Ni/V/Ni thin film system grown on single-crystalline MgO(001) substrate is reported. The field dependence of the superconducting transition temperature Tc for samples comprising Ni layers with similar values of the coercive field Hc reveals no anomalies. However, in samples with different thicknesses of the nickel layers the difference in Hc amounts up to \Delta H_c \sim 1.8 kOe, thus enabling to manipulate the relative orientations of the layers' magnetization by an external magnetic field. Surprisingly, for these samples the Tc for the parallel orientation of the magnetizations of the Ni layers is higher, in a certain magnetic field range, than for the antiparallel one, at odds with theoretical predictions. Possible reasons of this contradiction are discussed.