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Magnetomechanical Properties of Circumferentially Field-Annealed Metglas® 2605SC Cylinders

Published online by Cambridge University Press:  16 February 2011

J. B. Restorff ,
M. Wun-Fogle ,
A. E. Clark  and
Thu-Van T. Luu
J. B. Restorff
Affiliation:
Naval Surface Warfare Center, 10901 New Hampshire Ave., Silver Spring, MD 20903
M. Wun-Fogle
Affiliation:
Naval Surface Warfare Center, 10901 New Hampshire Ave., Silver Spring, MD 20903
A. E. Clark
Affiliation:
Naval Surface Warfare Center, 10901 New Hampshire Ave., Silver Spring, MD 20903
Thu-Van T. Luu
Affiliation:
Naval Surface Warfare Center, 10901 New Hampshire Ave., Silver Spring, MD 20903
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Abstract

We have measured the magnetomechanical coupling coefficient of Metglas®2605SC (Fe81B13.5C2) ribbons that were annealed into 1.27 and 0.8 cm diameter cylinders. Lengths ranged from 0.6 to 5 cm. A novel furnace was constructed in which a cylindrical magnetic field was supplied by a current carrying copper rod. During the annealing, a 300 A current created a circumferential field of more than 6400 A/m. Annealing temperatures ranged from 380 to 420 ºC. Large shifts in both the optimum bias field and the coupling coefficient as a function of length and diameter were found due to demagnetizing effects. Impedance vs. frequency measurements show large numbers of modes, some of which are field dependent. Effective coupling coefficientsof the lowest order longitudinal mode were calculated from impedance measurements by using k2 = 1-f2r/f2a, where fr, and fa. are the resonant and antiresonant frequencies respectively. Coupling coefficients for 5 cm long cylinders were as high as 0.58. When the demagnetizing factor is taken into account, we find material coupling coefficients as high as 0.89.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 213
Copyright
Copyright © Materials Research Society 1995

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References

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