Abstract

compounds with x = 0, 0.05, 0.10, 0.15, 0.20 and 0.25 have been studied in this paper. All of the compounds crystallize in the -type structure (space group P6/mmm). The substitution of Co for Mn in results in a monotonic decrease in the lattice constants and the unit-cell volume. The ordering temperature decreases monotonically from 423 K at x = 0 to 267 K at x = 0.25. The reorientation of the easy-axis magnetization of disappeared on Co substitution at x = 0.10, while for Co content x exceeding 0.15 a compensation temperature was observed in the thermal magnetization curve. The reorientation temperature decreases with Co content increase, while the compensation temperature increases. The magnetization curves up to 70 kOe at 4.5 K are given and the saturation magnetization decreases from at x = 0 to at x = 0.1 and then increases to at x = 0.25.

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