On the Magnetic and Electric Properties of (Fe_<1-x>Co_x)_<0.89>Cr_<0.11> Alloys

概要

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To make clear the mechanism of the appearance of large spontaneous volume magnetostriction of fcc (Fe_<1-x>Co_x)_<0.89>Cr_<0.11> alloys, their magnetization and elctrical resistivity were measured and the following results were obtained : (1) The dependences of the mean magnetic moments and the Curie point on the concentration, x, and the outer electron concentration, n, of the alloys were similar to those in the Fe-Ni and Fe-Pd Invar alloy systems. That is, the alloys in these three systems are ferromagnetic on the Co- and Ni-rich sides and their ferromagnetic moments disappeared at the n of about 8.2〜8.4 which corresponds to the concentration containing Fe more than it in Invar alloys. (2) The magnetization-temperature curve of the Invar alloys mentioned above did not follow Brillouin's function. (3) The electrical resistivity-temperature curves of the Invar alloys showed an anomalous broad maximum near the Curie point. And the residual resistivity were very large. These phenomena may be explained by the co-existence of the ferromagnetic and antiferromagnetic states. It may be considered that the co-exsistence of the two magnetic states is closely connected with the sharp drop of the ferromagnetic moments near the concentration of Invar type alloys.
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