MAGNETIC-PROPERTIES OF Y(FE,CO)10MO2 ALLOYS

The structural and magnetic properties of YFe10-xCoxMo2 alloys (0 less -than-or-equal-to x less-than-or-equal-to 10) have been investigated b y means of x-ray diffraction, thermomagnetic analysis, and magnetometr y techniques. All the alloys exhibited the tetragonal ThMn12 structure and were almost single phase materials. With the increase of Co conte nt x, T(c) increases initially, reaching a maximum at x approximately 6, followed by a decrease at higher x values. X-ray diffraction analys es on magnetically aligned samples indicate that YFe10Mo2 exhibits an axial easy direction of magnetization (EDM) at room temperature, and t he addition of Co initially causes the EDM to deviate gradually from t he c axis with increasing x (x less-than-or-equal-to 4). On further in crease of Co content (x greater-than-or-equal-to 5), the EDM of the YF e10-xCoxMo2 compounds tends to become axial again, reaching a complete uniaxial behavior for the terminal compound YCo10Mo2.