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Discovery of Giant Magnetostriction in Amorphous RFe2B (R = Sm, Tb) Alloys |
Journal of Magnetics, Volume 1, Number 2, 31 Dec 1996, Pages 64-68 |
Jai-Young Kim(Institute for Materials Research, Tohoku University) |
Abstract |
Compared with the conventional magnetostriction in Ni alloys which are in the order of several tens ppm (Parts Per Million =10-6), RFe2(R = rare earth element) Laves Phase intermetallic compounds show large saturation magnetostriction in the range of a few thousands ppm. However, the large external magnetic field necessary to obtain saturatio magnetostriction has due to large magnetocrystalline anisotropy energy restrained the applicationof magnetostriction materials in RFe2intermetallic compounds. As a result of its solution, the largest published value of effective giant magnetostriction in a low external magnetic field (less than a few hundred Oe) is reported in this paper by means of amorphisation of RFe2 intermetallic compounds with the addition of boron, as a half metal. For the amorphous (SmFe2)0.97 B0.03 alloys, the effective magnetostriction of -545 and -610×10-6 is obtained at 400 and 1,000 Oe, respectively. Moreover, the effective magnetostriction of 590 and 630×10-6 in the amorphous (TbFe2)0.98 B0.02 alloys is also found at 400 and 1,000 Oe, respectively. This result will provide a clue to understanding the effect of half metal on anomalous increase of the effective giant magnetostriction and attract the great attention for magnetostriction applications. |
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