Abstract
The temperature coefficient of delay time, αD, at 0 to 40°C and the maximum gradient of magnetostriction to magnetic field, (dλ⁄dH)m, at room temperature have been measured with the annealed alloys in the Co-Fe-Cr system, the Co-Fe-Cr-about 16.7% Ni system and the Co-Fe-Cr-about 28.6% Ni system. It has been found that in Co-31.0% Fe-9.0% Cr alloy the αD has such small value as −0.42×10−5. The (dλ⁄dH)m is 0.36×10−6/Oe and is comparable with the absolute value of −0.39×10−6/Oe in nickel. The αD for Co-37.8% Fe-4.3% Cr-16.7% Ni alloy also shows a very small value of −0.07×10−5, while its (dλ⁄dH)m shows a very large value of 0.80×10−6/Oe which is about two times greater than the absolute value of nickel and five times greater than that of Ni-Span C. And Co-50.0% Fe-2.4% Cr-28.6% Ni alloy has a small value of +0.21×10−5 for αD and 0.19×10−6/Oe for (dλ⁄dH)m which is about half of the absolute value of nickel. Among these alloys, Co-37.8% Fe-4.3% Cr-16.7% Ni alloy not only exhibit the excellent characteristics in its magnetostrictive delay line but also can easily be cold worked. Therefore, the alloy seems to be a material suitable for the delay line.
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