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    ?E effect in amorphous glass covered wires
    (Ieee-Inst Electrical Electronics Engineers Inc, 2000) Squire, PT; Atalay, S; Chiriac, H
    Amorphous Fe-Si-B glass-covered and glass-removed wires have been studied in the as-received state and after furnace annealing at 480 degrees C for various times. The M-H loops and magnetic field dependence of Young's modulus measurements have shown that the as-received, glass-covered wire has a single domain configuration with the easy axis parallel to the wire axis. It is suggested that the core-shell domain model applies in annealed, glass-covered and as-received wires after removal of the glass.
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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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    Effects of annealing on the magnetoelastic properties of Fe66Cr8Cu1Nb3Si13B9 ribbons
    (Ieee-Inst Electrical Electronics Engineers Inc, 1996) Squire, PT; Atalay, S; SlawskaWaniewska, A
    The field dependence of Young's modulus has been measured in samples of Fe66Cr8Cu1Nb3Si13B9 alloy annealed to induce varying nanocrystalline fractions. The results are interpreted partly in terms of internal stress relief and reduced magnetostriction in the nanocrystalline samples. It is necessary to invoke magnetocrystalline anisotropy within the nanocrystalline grains to explain the behaviour after annealing at higher temperatures and for longer times.
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    Magnetic and magnetoelastic properties of Fe-Si-B metallic fibers
    (Ieee-Inst Electrical Electronics Engineers Inc, 1996) Atalay, S; Squire, PT; Rudkowski, P
    Amorphous metallic Fe78Si9B13 fibers, 50 mu m in diameter, produced by the melt extraction method, have been studied in the as-quenched state and after furnace annealing at 455 degrees C and 480 degrees C for times between 0.5 min and 50 min. Measurements of the M-H loops and field dependence of Young's modulus have shown that they behave in a way very like that of amorphous wires. The minimum coercivity of 3 A/m is greater than that found in wires, and the minimum Young's modulus (similar to 0.45 times the saturation value) is greater. It is suggested that the core-shell domain model applies in the its-quenched state and that stress relief followed by surface crystallization dominate the anisotropy.
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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.
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    Study of nanocrystalline Fe-M-Cu-Nb-Si-B (M = Cr, Co, Ni) ribbons by elastic modulus measurements
    (Elsevier Science Sa, 2001) Atalay, S; Adiguzel, HI; Squire, PT; Sovak, P
    The magnetic and magnetoelastic properties of Fe72M1.5Cu1Nb3Si13.5B9 (M = Co, Cr, Ni) samples have been investigated. The samples were annealed between 400 and 650 degreesC under argon atmosphere to induce varying nanocrystalline fractions. It was observed that the magnitude of field dependence of Young's modulus varies from 50% to nearly zero as the saturation magnetostriction is reduced by alpha -FeSi grains. The results are discussed in terms of stress relief and reduced magnetostriction constant. (C) 2001 Elsevier Science B.V. All rights reserved.