论文部分内容阅读
The particle size dependent training effect have been investigated on the exchange coupled NiFe2O4/NiO nanogranular systems,with average particle size(DNFO)of NiFe2O4 ranging from~3 nm to~55 nm.For all samples,analysis of the field cycles(n)dependence on exchange bias fields(HEB)suggests that two distinct forms of training mechanism are existed.