Remanent Torque Studies in Polycrystalline BaFe12O19

Abstract

Measurements of the anisotropy distribution in BaFe₁₂O₁₉ were carried out using the remanent torque technique. Two randomly oriented powder samples with coercive forces of 1500 and 4000 oe were tested. The remanent torque curves for both samples were essentially identical indicating an anisotropy distribution with an average of 2.1±0.2×10⁶ ergs/cm³ compared with a value of 3.3×10⁶ ergs/cm³ for single crystal BaFe₁₂O₁₉. The origin of this disagreement is unclear but it seems to be associated with splitting into domains.