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

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.
Authors:
; ; ; ;  [1] ; ;  [2]
  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)
Publication Date:
OSTI Identifier:
22410089
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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