Manufacturing of Textured Bulk Fe-SmCo$_{5}$ Magnets by Severe Plastic Deformation

TL;DR

This study demonstrates that severe plastic deformation via high-pressure torsion can produce textured, bulk Fe-SmCo$_{5}$ magnets with enhanced exchange coupling and magnetic anisotropy, overcoming size limitations of nanostructuring.

Contribution

It introduces a method to create bulk textured Fe-SmCo$_{5}$ magnets with improved magnetic properties through severe plastic deformation.

Findings

Enhanced exchange coupling due to shear deformation.

Texture development leads to anisotropic magnetic behavior.

Bulk magnets with improved performance achieved.

Abstract

Exchange-coupling between soft- and hard-magnetic phases plays an important role in the engineering of novel magnetic materials. To achieve exchange coupling, a two-phase microstructure is necessary. This interface effect is further enhanced if both phase dimensions are reduced to the nanometer scale. At the same time, it is challenging to obtain large sample dimensions. In this study, powder blends and ball-milled powder blends of Fe-SmCo$_{5}$ are consolidated and are deformed by high-pressure torsion (HPT), as this technique allows us to produce bulk magnetic materials of reasonable sizes. Additionally, the effect of severe deformation by ball-milling and severe plastic deformation by HPT on exchange coupling in Fe-SmCo$_{5}$ composites is investigated. Due to the applied shear deformation, it is possible to obtain a texture in both phases, resulting in an anisotropic magnetic behavior and an improved magnetic performance.