Abstract
Magnetic properties of Ho6Fe23−xAlx compounds (x=0, 2.5, and 5) are reported in the temperature range of 5–550K under a magnetic field of up to 90kOe. A large decrease of the Curie temperature is obtained (−20K per Al atom) as in Y6Fe23−xAlx. The compensation temperature varies from 185K (x=0) to 280K (x=5); it is associated with a strong increase of low-temperature spontaneous magnetization (+2.3μB per Al atom). In the vicinity of Tcomp field-induced transitions are observed for x=0 and x=2.5. The different results are analyzed within the frame of the Néel ferrimagnetic model: the Ho–Fe and Fe–Fe magnetic interactions and the canting angle are then determined. The presence of the rare-earth Ho “stabilizes” the ferrimagnetism.
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