Abstract
Four nanosystems possessing the first order magnetic phase transitions (FOMPT) are considered: (1) isolated iron oxide nanoclusters, (2) iron oxide nanostructures in the beginning of sintering, (3) nanostructures induced by shear stress under high-pressure action, (4) ordered iron oxide nanostructures. The thermodynamic models for FOMPT appearance and cluster critical size are proposed. The role of surface tension, defect density and nanocluster organization are discussed.
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