Abstract
The (AlxCr1−x)2O3/Co granular systems were synthesised by a convenient sol–gel method combined with autocombustion. Well crystallised samples are obtained after being annealed at 1073 K for 1 h and all of them possess a porous structure. Exchange bias effect of all the samples is investigated at different temperatures. Exchange bias field and coercivity are affected noticeably by Al concentration and temperature. The different magnetic behaviour of the samples can be well explained in terms of the domain state model. Temperature dependence of magnetisation for sample x = 0 is investigated and a large irreversibility is observed in the whole temperature range.
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