Magneto-strictive behavior of Fe-B(001) single-crystal films under rotating magnetic fields

Melt-spun amorphous Fe-B based alloys have good soft magnetic properties and are widely used as magnetic core materials for transformers. However, since these alloys have large positive magnetostriction, audible noise caused by the core vibration is an issue to be solved [1]. In order to solve the issue, it is necessary to investigate the magneto-strictive behavior of Fe-B alloys. Most of the researches have been carried out using melt-spun ribbons with amorphous structure for the B composition exceeding 11 at. % [2]. Thus the magneto-strictive behavior of Fe-B alloy for the B compositional range 0-11 at. % has not yet been made clear. Sputter-deposited Fe-B alloy films show metastable bcc solid solution which is supersaturated with B up to 13 at. % B [3]. In order to study the magnetostriction variation dependence on B content, magnetostriction and related magnetic properties are investigated for metastable bcc Fe-B poly- and single-crystal thin films prepared by sputtering.