Magnetostriction Measurements of (Fe-Co)-Mo-Cu-B Alloys with Varying Atomic Fe/Co Ratio |
| G. Vlasák, D. Janičkovič and P. Švec
Institute of Physics, SAS, 845 11 Bratislava, Slovakia |
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| Received: 9 07 2007; |
| Amorphous rapidly quenched ribbons of (Fe-Co)76Mo8Cu1B15 with the ratio Co/Fe = 0, 1/9, 1/6, 1/4, 1/3, 1/2, 1/1 and 2/1 were prepared by planar flow casting. The dependence of the Curie temperature TC on Co/Fe ratio was determined. Due to the presence of the invar effect it was possible to measure the spontaneous volume magnetostriction in the temperature interval between 300 K and TC. Field dependences of magnetostriction in parallel and perpendicular directions of applied magnetic field were obtained by direct measurement method. Subsequently, saturation magnetostriction and volume magnetostriction as well as forced magnetostriction were computed. Saturation magnetostriction increases with increasing Co/Fe ratio from 0 up to 17 ppm, depending both on the Co/Fe ratio and on the shift of TC with composition. The alloy with ratio Co/Fe = 0 exhibits TC near room temperature, thus field dependences of magnetostriction, corresponding to the dependences of a paramagnetic system are practically linear functions of applied field, corresponding to paramagnetic state. |
| DOI: 10.12693/APhysPolA.113.107 PACS numbers: 75.50.Kj, 75.80.+q |