Title :
Effect of oxygen impurity on magnetostriction of directionally solidified Tb0.3Dy0.7Fe1.8
Author :
Kim, Do Hyung ; Kwon, Oh Yeoul ; Kim, Jong Chul ; Lee, Zin Hyoung
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Adv. Inst. of Sci. & Technol., South Korea
fDate :
7/1/2004 12:00:00 AM
Abstract :
A giant magnetostrictive alloy, Terfenol-D, is known to have high magnetostriction and low anisotropy energy. However, oxygen contamination deteriorates the magnetic and magnetoelastic properties of giant magnetostrictive material. Oxygen impurity can originate from the raw materials and from the environment during the manufacturing process. Therefore the effect of oxygen on the magnetostrictive properties and the microstructure of the Tb0.3Dy0.7Fe1.8 alloy were quantitatively investigated. The results demonstrated that as oxygen content increased, magnetostrictive strain and magnetostrictive coefficient decreased. These effects were discussed from the standpoint of microstructure.
Keywords :
directional solidification; dysprosium alloys; magnetic impurities; magnetostriction; oxygen; terbium alloys; Tb0.3Dy0.7Fe1.8; Terfenol-D; anisotropy energy; directional solidification; magnetic properties; magnetoelastic properties; magnetostriction; magnetostrictive alloy; magnetostrictive coefficient; magnetostrictive strain; manufacturing process; microstructure; oxygen contamination; oxygen impurity; Anisotropic magnetoresistance; Contamination; Impurities; Magnetic anisotropy; Magnetic materials; Magnetic properties; Magnetostriction; Microstructure; Oxygen; Perpendicular magnetic anisotropy; Directional solidification; Terfenol-D; giant magnetostriction; impurity;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.832136