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    The effect of annealing and crystallization on the magnetoelastic properties of Co-Si-B amorphous wires
    (Amer Inst Physics, 1996) Atkinson, D; Squire, PT; Atalay, S
    The field dependence of Young's modulus (Delta E effect) of amorphous wires of Co72.5Si12.5B15 has been studied in the as-quenched state, and after annealing for times between one and several hundred minutes at temperatures of 450, 480, and 500 degrees C. In the as-quenched state the Delta E effect is small (<2%), because the quenching stresses couple with the magnetostriction (lambda(s) similar to-3X10(-6)) to produce significant anisotropy. Annealing for short times (>1 min) is sufficient to relieve much of the quenching stress, resulting in magnetic softening and enhanced Delta E effect (at best >30%). Further annealing eventually reverses these trends, increasing coercivity and anisotropy, and reducing the Delta E effect. This behavior is attributed to surface crystallization. The results are interpreted in terms of the core-shell domain model, and are consistent with the retention of a significant component of circumferential domain structure in the shell in all annealing conditions studied. (C) 1996 American Institute of Physics.
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    Magnetoelastic properties of annealed Co72.5Si12.5B15 amorphous wires
    (Elsevier Science Bv, 1996) Atalay, S; Squire, PT; Atkinson, D; Hogsdon, SN
    We report measurements of the Delta G effect and magnetomechanical damping in as-quenched and annealed amorphous wires of Co72.5Si12.5B15 having a saturation magnetostriction lambda(s) of about -3 x 10(-6). Samples were measured in the as-quenched state, and after annealing at 450 degrees C for times between 30 s and 1000 min. Delta G of up to 10% add magnetomechanical damping up to 0.004 have been found.