Tuning the Magnetic Properties of M-type Hexaferrites

TL;DR

This paper reviews methods for synthesizing M-type hexaferrites, examines how cationic substitutions affect their magnetic properties, and presents new findings on Co-Ti substituted hexaferrites improving magnetic recording performance.

Contribution

It introduces new synthesis results for Co-Ti substituted hexaferrites and analyzes their enhanced magnetic properties for recording applications.

Findings

Co-Ti substitution improves saturation magnetization.

Coercivity is reduced to favor high-density magnetic recording.

Inter-particle interactions are observed in particulate samples.

Abstract

In this article, common experimental techniques and preparation conditions adopted for the synthesis of M-type hexaferrites and their influence on the magnetic properties are briefly reviewed. The effects of various strategies of cationic substitutions on the properties of the hexaferrites are addressed. Further, our synthesis and findings on Co-Ti substituted hexaferrites are presented. It was found that Co-Ti substitution results in improving the saturation magnetization, and reducing the coercivity down to values favorable for high density magnetic recording. Also, evidence of inter-particle interactions in the particulate samples was observed.