Abstract
Nanostructured materials are designed with a specific ratio of hard-to-soft magnetic phase to enhance maximum energy products. This chapter provides useful information about the nature and practices of exchange-spring ferrites. In the first section, the roles of soft phase thickness and exchange length in the exchange coupling between soft and hard phases are studied. Various ferrite-based exchange-spring composites are also evaluated. Structural and magnetic analyses of hard ferrite–iron oxide nanocomposites are investigated. Nanocomposites consisting of hard ferrite–Ni-based soft ferrite and hard ferrite–Co ferrite are presented. The roles of effective processing parameters and the nanocomposite configuration of soft and hard phases in the magnetic characteristics and (BH)max variation are studied. Then, the core–shell structure with sufficient exchange interaction between hard and soft phases composed of hard ferrite–soft iron cobalt and cobalt ferrite–iron cobalt is studied, and the role of shell thickness in magnetic properties is investigated. Finally, case studies of magnetic properties for metallic magnet–ferrite and inverted nanocomposites are presented.
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