Evolution of microstructures and magnetic properties of SmCo/Fe(Co) nanocomposite magnets prepared by HPTC with different soft-phase contents

Abstract

abstract Evolution of microstructures and magnetic properties of SmCo/Fe(Co) bulk nanocomposite magnets fabricated by high-pressure thermal compression (HPTC) with different soft magnetic phase contents and height reductions was investigated. With increasing α-Fe content from 22 wt% to 30 wt%, the (00l) texture of the SmCo7 phase decreases and the grain size of SmCo7, SmCo3 and Fe(Co) phases remains nearly unchanged. The remanence of the magnets increases and their coercivity decreases with increasing α-Fe content, yielding a maximum energy product of 26 MGOe at the α-Fe content of 26 wt%. With the height reduction from 0% to 78% during the HPTC process, the (00l) texture of the SmCo7 phase increases, but no obvious change in the grain size of SmCo7, SmCo3 and Fe(Co) phases; moreover, both the remanence and coercivity increase, yielding a maximum energy product of 25.6 MGOe at the height reduction of 78%.