MAGNETIC-PROPERTIES AND MAGNETOSTRICTION IN GRAIN-ORIENTED (TBXDY1-X)(FE1-YMNY)(1.95) COMPOUNDS

The magnetic properties and magnetostriction in grain-oriented (TbxDy1 -x)(Fe1-yMny)(1.95) compounds with 0.3 less than or equal to x less th an or equal to 0.5, 0 less than or equal to y less than or equal to 0. 2 prepared by the Bridgman method have been investigated. It is confir med that the Mn substitution not only lowers the spin reorientation te mperature but also enhances lambda(100). This large lambda(100) is con tradictory to the single-ion model. For Tb0.5Dy0.5 (Fe0.9Mn0.1)(1.95) compound, no spin reorientation, which induces the sharp drop in the m agnetostriction is seen in the temperature range from 77 to 400 K. In addition, by choosing the appropriate compressive stress, the quite ex cellent thermal stability and the large magnetostriction of 2000 ppm i n the low applied field can be realized in the Tb0.5Dy0.5(Fe0.9Mn0.1)( 1.95) compound. These features make Tb0.5Dy0.5(Fe0.9Mn0.1)(1.95) a pro mising material applicable to the various giant magnetostrictive actua tors.