Low-temperature sintering and magnetic properties of Sc- and In-substituted M-type hexagonal barium ferrites for microwave applications

Publikationstyp
Journal Article
Publikationsdatum
2017-02-01
Sprache
English
Author
Bierlich, Silvia 
Gellersen, Frauke K. H. 
Jacob, Arne 
Töpfer, Jörg 
Institut
Hochfrequenztechnik E-3 
TORE-URI
http://hdl.handle.net/11420/7977
Enthalten in
Materials research bulletin 
Volume
86
Start Page
19
End Page
23
Citation
Materials Research Bulletin (86): 19-23 (2017-02-01)
Publisher DOI
10.1016/j.materresbull.2016.09.025
Scopus ID
2-s2.0-84989876823
Publisher
Elsevier
Partial substitution of Fe3+ by Sc3+ or In3+ in M-type ferrite is an effective method to tailor their anisotropy field and resonance frequency. BaMexFe12-xO19 with Me = Sc and In (0 ≤ x ≤ 2) was synthesized by the mixed-oxide route. XRD revealed a continuous increase of the hexagonal lattice parameters with substitution rate x. Both, the saturation magnetization and coercivity at room temperature are reduced with x. The ferromagnetic resonance frequency decreases from 48 GHz at x = 0 to 30 GHz at x = 0.5 for Sc-substituted ferrites. For In-substitution, a smaller reduction of the resonance frequency with x is observed, e.g. to 37 GHz at x = 0.5. Addition of BBSZ glass allows sintering at 900 °C. Low-temperature fired samples exhibit ferromagnetic resonance at the same frequencies and represent promising materials for self-biased microwave components for integration into LTCC multilayer modules.
Schlagworte
Magnetic materials
Magnetic properties
Microwave ferrites
Multilayers
Oxides
DDC Class
600: Technik
More Funding Information
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 .