Publisher DOI: 10.1016/j.jeurceramsoc.2019.04.014
Title: Sintering, microwave properties, and circulator applications of textured Sc-substituted M-type ferrite thick films
Language: English
Authors: Bierlich, Silvia 
Reimann, Timmy 
Gellersen, Frauke K. H. 
Jacob, Arne 
Töpfer, Jörg 
Issue Date: Aug-2019
Source: Journal of the European Ceramic Society 10 (39): 3077-3081 (2019-08)
Journal or Series Name: Journal of the European Ceramic Society 
Abstract (english): Sc 3+ substituted M-type ferrites are effective microwave magnetic materials with a ferromagnetic resonance frequency in the range of 20 GHz–50 GHz. We report on the fabrication of oriented ferrite thick films as microwave components for application in the K a -band at 30 GHz. Films of BaFe 11.5. Sc 0.5 O 19 were prepared by screen-printing on alumina substrates, drying in an external magnetic field, and sintering at 900 °C. Low-temperature sintering is achieved through use of a mixed BBSZ/CuO sintering aid. A strong anisotropy of the sintered ferrite films is revealed by XRD analysis. Microwave properties of the films were determined in a coplanar waveguide setup. The ferromagnetic resonance frequency of the films is at 30 GHz and the textured films possess good nonreciprocal properties which scale with film thickness. The films were tested in a Y-junction circulator, and represent promising materials for self-biased microwave components fabricated in thick film technology.
ISSN: 0955-2219
Institute: Hochfrequenztechnik E-3 
Type: (wissenschaftlicher) Artikel
Funded by: The authors acknowledge funding and support of the German Aerospace Center (DLR) on behalf of the German Federal Ministry of Economics and Technology (BMWi) under grants 50YB1308 and 50YB1305
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