Magnetic properties and magnetostriction in Tb_(0.5)Dy_(0.5)(Fe_(0.9)Mn_xAl_(0.1-x))_(1.95) compounds

摘要

It is a breakthrough that giant magnetostriction has been found in the RFe_2 alloys. However, the compounds possessing huge magnetostriction at room temperature have large magnetic anisotropy. In reducing the anisotropy a series of work has been reported by substituting the elements in RFe_2 with other rare earth, transition metal and Ill-group elements. In this paper, samples were prepared by substituting the part of Fe by Mn and Al in Tb_(0.5)DY_(0.5)Fe_(1.95), their metallo-graphic organizations depending on Mn and Al, and the magnetization and magnetostriction of the Tb_(0.5)Dy_(0.5)(Fe_(0.8)Mn_xAl_(0.1-x))_(_(1.95)) compounds were studied. It is found that Al can improve the crystalline state of Tb_(0.5) Dy_(0.5) Fe_(1.95) and both Mn and Al can reduce the magnetic anisotropy.