Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Complex Magnetic Oxides
MA 3.2: Vortrag
Montag, 9. März 2026, 09:45–10:00, POT/0112
Controlling Magnetic Anisotropy in Barium Hexaferrite by Cation Doping — •Jakob Baumsteiger1,2 and Cesare Franchini1,2 — 1Faculty of Physics and Center for Computational Materials Science, University of Vienna, Vienna, Austria — 2Department of Physics and Astronomy "Augusto Righi", Alma Mater Studiorum - Università di Bologna, Bologna, Italy
Circulators are essential components in many radio-frequency systems, including 5G base stations. Their operating frequency is primarily determined by the magnetic properties of the ferrite core - specifically the anisotropy field and the saturation magnetization. Experimental studies suggest that both quantities can be actively modified in barium hexaferrite - one of the ferrites commonly used in circulators - through cation doping. However, the relationship between doping and the resulting magnetic properties is highly complex and not yet fully understood. We investigate the electronic structure of pristine and cobalt-doped barium hexaferrite using density functional theory. Our calculations show that the additional electron introduced by cobalt plays a key role in modifying the material's magnetocrystalline anisotropy. By occupying a localized orbital at the cobalt site, it locally activates spin-orbit interactions, leading to substantial changes in the magnetocrystalline anisotropy energy even at low doping concentrations. The insights gained from our results support the design of miniaturized circulators capable of operating over broad frequency bands.
Keywords: Hexaferrite; Magnetocrystalline Anisotropy; Saturation Magnetization; Doping; Density functional theory