✍ Scribed by X.C. Kou; R. Grössinger; T.H. Jacobs; K.H.J. Buschow
No coin nor oath required. For personal study only.
ErzFe,,Cr with x = 0, 0.4, 0.6, 0.8, 1.0 and 1.5 were investigated by means of AC initial susceptibility measurements and X-ray diffraction. Spin reorientation transitions, marking the changes in easy magnetization direction (EMD) with increasing temperature from parallel to the c-axis to perpendicular to the c-axis, were observed in Er,Fe,,C, for x 2 0.8. From X-ray diffraction measurements it was found that the crystal structure of ErZFe,,C, changes with increasing carbon concentration from hexagonal (Th,Ni,,-type) to rhombohedral (ThzZn 17-type). In samples (x > 0.8) in which both crystallographic forms were found we detected two different spin reorientation temperatures.
The difference in spin reorientation temperatures between the two crystallographic forms was explained on the basis of differences in the crystal structure and concomitant differences in crystal field effects.
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