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Kerr Microscopy Studies of SmFe Thin Film

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We are studing Giant Magnetostrictive Materials (GMMs) that have a magnetostriction of 1000 ppm or more. SmFe is one type of GMM. This paper describes the results of measuring the magnetic characteristics and magnetic domain structure of SmFe thin film during the application of a tensile force and for use as a force sensor. The SmFe thin film consists of 17.2% Sm by atomic % and 82.8% Fe by atomic % treated at 250 °C in a vacuum. The results show that the maximum flux density, the remnant flux density, the differential permeability, and the size of the magnetic domain decrease, when the tensile force increases. Finally, this paper describes that it is appropriate to apply the SmFe thin film as a force sensor when an internal stress of 6.2 GPa or less is applied by using the change in the differential permeability; that is, the change in inductance.


Document Type: Research Article


Publication date: 2009-06-01

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