Low power loss and field-insensitive permeability of Fe-6.5%Si powder cores with manganese oxide-coated particles

Journal Article · Thu May 07 04:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4919038· OSTI ID:22410089

Li, Junnan; Wang, Xian; Xu, Xiaojun; Gong, Rongzhou; Feng, Zekun ^[1]; Chen, Yajie; Harris, V. G. ^[2]

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1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
2. Department of Electrical and Computer Engineering, Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, Massachusetts 02115 (United States)

Fe-6.5%Si alloy powders coated with manganese oxides using an innovative in situ process were investigated. The in-situ coating of the insulating oxides was realized with a KMnO{sub 4} solution by a chemical process. The insulating manganese oxides with mixed valance state were verified by X-ray photoelectron spectroscopy analysis. The thickness of the insulating layer on alloy particles was determined to be in a range of 20–210 nm, depending upon the KMnO{sub 4} concentration. The powder core loss and the change in permeability under a DC-bias field were measured at frequencies ranging from 50 to 100 kHz. The experiments indicated that the Fe-6.5%Si powder cores with a 210 nm-thick manganese oxide layer not only showed a low core loss of 459 mW/cm{sup 3} at 100 kHz but also showed a small reduction in permeability (μ(H)/μ(0) = 85% for μ = 42) at a DC-bias field of 80 Oe. This work has defined a novel pathway to realizing low core loss and field-insensitive permeability for Fe-Si powder cores.

• OSTI ID: 22410089
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 117; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CONCENTRATION RATIO
IRON BASE ALLOYS
KHZ RANGE
LAYERS
MANGANATES
MANGANESE OXIDES
PARTICLES
PERMEABILITY
POTASSIUM COMPOUNDS
POWDERS
POWER LOSSES
SILICON ALLOYS
X-RAY PHOTOELECTRON SPECTROSCOPY