Amorphous FeCoNi-SiB alloys having zero magnetostriction

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Abstract
Zero magnetostriction compositions in the (FeaCo1−a−bNib)100−y(Si0.4B0. 6)y system in the range 20⩽y⩽30 and 0⩽b⩽0.6, the resultant magnetic properties, and the crystallization temperatures were systematically studied as functions of Ni content (b) and metalloid content ( y). The iron content (a=0.058−0.11) decreases with increasing metalloid content ( y), increases with Ni content (b), and then decreases with the addition of Ni. The effects of annealing on low-field magnetic properties were studied for two kinds of alloys; a high-Bs alloy and a high-μ alloy. For the high-Bs alloy, the effect of sample shape was also studied. The high remanence observed for a tape-wound toroid and the low remanence observed for a ring-laminated toroid in the as-quenched state are attributed to weak uniaxial anisotropy, whose origin may be due to local tension as well as atomic and impurity arrangement introduced during the quenching. By annealing at Tc <Ta <Tx , high-μ alloys with relatively low Hc and Br were obtained.

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