Spin reorientation and M?ssbauer effect studies on Tb0.3Dy0.7(Fe1－xAlx)1.95 alloys

The effect of Al substitution for Fe on the spin reorientation and Mssbauer spectra of a series of Tb03Dy07(Fe1-xAlx)195 alloys (x=005，01，015，020，025，030，035) at room temperature and 77K has been investigated systematically. The results indicate that the easy magnetization direction in the {100} plane deviates slightly from the main axis of symmetry, namely spin rerioentation. A small amount of non_magnetic phase exists for x=015, and the alloys become paramagnetism when x>015 at room temperture, but at 77K the alloys still remain to be magnetic phase even at x=02. At room temperature and 77K, the hyperfine field decreases and the isomer shift increases with increasing concentration of Al, and the quaduple splitting QS shows weak concentration dependence.