Improvement of high-frequency characteristics of Z-type hexaferrite by dysprosium doping

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3600068· OSTI ID:21538455

Chunhong, Mu; Yingli, Liu; Yuanqiang, Song; Liguo, Wang; Huaiwu, Zhang ^[1]

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1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China)

Z-type hexaferrite has great potential applications as anti-EMI material for magnetic devices in the GHz region. In this work, Dy-doped Z-type hexaferrites with nominal stoichiometry of Ba{sub 3}Co{sub 2}Dy{sub x}Fe{sub 24-x}O{sub 41} (x 0.0, 0.05, 0.5, 1.0) were prepared by an improved solid-state reaction method. The effects of rare earth oxide (Dy{sub 2}O{sub 3}) addition on the phase composition, microstructure and electromagnetic properties of the ceramics were investigated. Structure and micromorphology characterizations indicate that certain content of Dy doping will cause the emergence of the second phase Dy{sub 3}Fe{sub 5}O{sub 12} at the grain boundaries of the majority phase Z-type hexaferrite, due to which the straightforward result is the grain refinement during the successive sintering process. Permeability spectra measurements show that the initial permeability reaches its maximum of 17 at 300 MHz with x = 0.5, while the cutoff frequency keeps above 800 MHz. The apparent specific anisotropy field H{sub K} of Dy-doped Z-type hexaferrites decreases with x increasing. The relationships among phase composition, grain size, permeability spectra, and anisotropy are theoretically investigated, and according to the analysis, Dy doping effects on its magnetic properties can be well explained and understood.

• OSTI ID: 21538455
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 12; Other Information: DOI: 10.1063/1.3600068; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BARIUM COMPOUNDS
CERAMICS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
DOPED MATERIALS
DYSPROSIUM ADDITIONS
DYSPROSIUM OXIDES
FERRITES
FLUORESCENCE
GRAIN BOUNDARIES
GRAIN REFINEMENT
GRAIN SIZE
MAGNETIC SUSCEPTIBILITY
PERMEABILITY
SINTERING
SOLIDS
SPECTRA
STOICHIOMETRY
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
DYSPROSIUM ALLOYS
DYSPROSIUM COMPOUNDS
EMISSION
FABRICATION
FERRIMAGNETIC MATERIALS
IRON COMPOUNDS
LUMINESCENCE
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHOTON EMISSION
PHYSICAL PROPERTIES
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS