Abstract
Electromagnetic absorption materials that allow the control of waves have demonstrated great potential in various microwave applications with highly conducting materials, and an ongoing motivation for new methods of tuning absorption using magnetic oxides has been excited by magnetoelectric and spintronic applications. In this work, we present a method of tuning absorption of terahertz dielectric ceramics through spin-reorientation transitions. TbFeO3, DyFeO3 and ErFeO3, which are perovskite-structured canted antiferromagnets, are chosen. The extinction coefficient κ, dissipation factor tanδ and absorption coefficient α are selected as parameters to describe absorption. During cooling, these parameters show a strong dependence on continuous or discontinuous spin-reorientation transitions, which are closely determined by magnetic anisotropy constants. This research uncovers the distinctive role of spin-reorientation transitions in providing magnetic orthoferrites for tuning absorption, and expands the scope of functionality of this family for terahertz applications.
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