J. Phys. IV France 08 (1998) Pr2-183-Pr2-186
On the structural and physical properties of sputtered multilayers of the FeSiB-CuNb alloy systemG. Henninger1, A. Teresiak2, M. Müller1, 2 and N. Mattern2
1 Institute of Material Science IfWW, University of Technology TU Dresden, Helmholtzstr. 7, 01169 Dresden, Germany
2 Institute of Solid State and Materials Research IFW, Helmholtzstr. 20, 01169 Dresden, Germany
Multilayers of the FeSiB-CuNb alloy system have been prepared by the DC-magnetron-sputtering technique. In this way, a Fe(Si) alloy representing the crystalline and a FeBNb alloy representing the amorphous phase were deposited alternately. It was found that a microstructure of nanosized Fe(Si) and amorphous FeBNb is obtainable without heat treatment. In these multilayers, the coercive force Hc is independent of the amorphous layer thickness in the as-deposited state and after heat treatment up to 823 K. With Hc = 76 A/m, the lowest values found are high in comparison to that ones observed on nanocrystalline ribbons of the same composition. Internal stresses induced during deposition and heat treatment are found to be the origin of this difference. Above TA = 823 K, the coercive force rises strongly, although the FeBNb phase does not crystallize. The increase is attributed to an intergranular phase forming when the multilayer structure is starting to be destroyed by diffusion. At TA = 973 K, a linear dependence of the coercive force on the FeBNb interlayer thickness and hence on the chemical composition of the Fe(Si) grain boundary phase formed is found.
© EDP Sciences 1998