Electronic structure and magnetostrictive sensitivity of Fe-B metallic glasses
A. B. Beznosov, E. L. Fertman, V. V. Eremenko, and V. A. Desnenko
B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61164, Ukraine
Received December 11, 2000
The effect of mechanical tensile stresses 0 ≤ s ≤ 62 MPa on the low-field (0 ≤ H ≤ 45 Oe) magnetization curves of the metallic glasses Fe100-xBx (x=14, 16, 17, 20) is studied at temperatures of 77 and 300 K. The correlation between the electronic structure of the glasses and their magnetostrictive sensitivity ks is revealed: the eutectic metallic glass Fe83B17, which possesses a special electronic structure with a 30% lower conduction (sp) electron density, has a value of ks differing substantially from that of the other metallic glasses studied. Under low stresses (0 ≤ s ≤ 22 MPa) the eutectic alloy possesses a magnetostrictive sensitivity ks(s1) which is higher than that of the rest of the alloys studied, while under high stresses (22 MPa ≤ s ≤ 62 MPa) its magnetostrictive sensitivity ks(s2) is close to zero.