Controlling Exchange Coupling Strength in Ni x Cu1−x Thin Films
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The thickness (d F) and concentration (x) dependence of the Curie temperature of Ni x Cu1−x (d F) ferromagnetic alloy layers (x=0.55, 0.65, d F=[4.5 nm÷12 nm]) in contact with a vanadium layer was studied. The Curie temperature of the ferromagnetic layers depends on the thickness when it is comparable with the transition layer between the F and the vanadium layers, which is attributed to the proximity coupling of the interface region with the rest of the F layer. The present study provides valuable information for fabrication of samples with controlled exchange coupling strength for studies of superconductor/ferromagnet proximity effects.
KeywordsFerromagnet thin film Finite size effect Proximity coupling
We acknowledge G. Gy. Kertész for help with the sample preparation and Drs. J. Major, I. Bakonyi, and A.A. Golubov for their fruitful discussions. The financial support of the National Office of Innovation of Hungary under contract NAP-VENEUS and the European Commission under the 7th Framework Programme through the “Research Infrastructures” action, NMI3, is gratefully acknowledged.
- 3.Buzdin, I., Bulaevskii, L.N.: Sov. Phys. JETP 67, 576 (1988) Google Scholar
- 5.Chakrabarty, D.J., Laughlin, D.E., Chen, S.W., Chang, Y.A.: In: Nash, P. (ed.) Phase Diagrams of Binary Nickel Alloys, pp. 85–95. ASM International, Materials Park (1991) Google Scholar