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Nanocrystalline Soft Magnetic Alloys for Space Applications

  • Matthew A. Willard (a1), Thomas Francavilla (a2), Ramasis Goswami (a2) and Vincent G. Harris (a3)


This study focuses on a Co-based nanocrystalline alloy (Co84.55Fe4.45Zr7B4) with potential for long-term high temperature use. As an indication of their performance, core losses were measured on toroidal samples using a Walker AC permeameter over a frequency range of 0.1 to 500 kHz, at induction amplitudes of 100, 300, and 500 mT, and temperatures from 22 to 300°C. For a given frequency and maximum induction amplitude, the losses were invariant as a function of measurement temperature. Vibrating sample magnetometry provided the magnetization and hysteretic losses as a function of temperature. As the temperature of the alloy was raised to 300°C from room temperature, the saturation magnetization (120 emu/g)was reduced by less than 15%. A toroid was aged at 300°C for up to 300 hours and core loss measured as a function of aging time at the previously mentioned frequencies and induction amplitudes. The losses were invariant over the aging time.



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1. Willard, M. A., Claassen, J. H., Stroud, R. M., and Harris, V. G., J. Appl. Phys. 91 (10), 8420 (2002).
2. Willard, M. A., Claassen, J. C., Stroud, R. M., Francavilla, T. L., and Harris, V. G., IEEE Trans. Mag. 38 (5) Pt.1, 3045 (2002).
3. Johnson, F. (private communication).
4. Herzer, G., J. Magn. Magn. Mater. 112, 258 (1992).


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