Abstract
The soft magnetic material characteristics of iron-nickel, iron-cobalt, and iron-silicon are compared to a variety of amorphous alloys. The properties of the amorphous alloy toroids, as-wound, improve with decreasing magnetostriction as expected. However, even after annealing to completely stress-relieve the toroid, the properties still depend strongly on magnetostriction. To date, the amorphous alloys have somewhat higher losses and lower permeabilities than the same thickness Fe-Ni alloys have but the amorphous alloys are significantly superior to the Fe-Co and Fe-Si alloys. Applications of the amorphous alloys in small electronic devices appear to be justified where the design optimization can make use of (1) the lower cost expected from the amorphous alloys, (2) the higher induction of some of the amorphous alloys compared to the Fe-Ni alloys, or (3) their lower losses and higher permeabilities compared to the crystalline Fe-Co and Fe-Si alloys. The high saturation amorphous alloys of Fe-B as thin tapes have about one-fourth the losses of the best grain-oriented Fe-3.2% Si sheet steel measured with sine flux, but the saturation magnetization is 20% lower. The design implications of these differences for power devices is not immediately clear.
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Luborsky, F.E. (1977). Perspective on Application of Amorphous Alloys in Magnetic Devices. In: Levy, R.A., Hasegawa, R. (eds) Amorphous Magnetism II. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-4178-9_34
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DOI: https://doi.org/10.1007/978-1-4613-4178-9_34
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