Magnetostriction of Co80−xTxB20 (T = Fe, Mn, Cr, or V) glasses

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Abstract
Magnetostriction measurements as a function of temperature and composition are reported in non‐crystalline Co80−xTxB20 alloys (T = Fe, Mn, Cr or V with 0⩽x⩽12 at. %). The room temperature saturation magnetostriction λs changes sign with the substitution of Fe, Mn or Cr for Co in Co80B20 glass. These results are well described by the virtual‐bound‐states (VBSs) introduced above the 3d band by the light T solutes. The positions of 3d↑ (3d majority spin) VBS with respect to the Fermi energy is established. The magnetostrictions of Co72Mn8B20 and Co70Cr10B20 glasses (negative at 295 K) also change sign with increasing temperature. This is the first direct observation of magnetostriction‐compensation temperatures in non‐crystalline metals. The existence of these magnetostriction compensation temperatures is interpreted to be a consequence of the different temperature dependences of single‐ion and two‐ion contributions to λs.