Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 324, Issue 22, Pages 3899-3905Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2012.06.042
Keywords
Mn-Zn ferrite; Soft magnetic composite; Annealing treatment; Permeability
Funding
- Office Of The Director
- Office Of Internatl Science &Engineering [966248] Funding Source: National Science Foundation
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This paper focuses on iron-based soft magnetic composites which were synthesized by utilizing Mn-Zn ferrite nanoparticles to coat iron powder. The nanocrystalline iron powders, with an average particle diameter of 20 nm, were obtained via the sol-gel method. Scanning electron microscopy, energy dispersive X-ray spectroscopy and distribution maps show that the iron particle surface is covered with a thin layer of Mn-Zn ferrites. Mn-Zn ferrite uniformly coated the surface of the powder particles, resulting in a reduced imaginary permeability, increased electrical resistivity and a higher operating frequency of the synthesized magnets. Mn-Zn ferrite coated samples have higher permeability and lower magnetic loss when compared with the non-magnetic epoxy resin coated compacts. The real part of permeability increases by 33.5% when compared with the epoxy resin coated samples at 10 kHz. The effects of heat treatment temperature on crystalline phase formation and on the magnetic properties of the Mn-Zn ferrite were investigated via X-ray diffraction and a vibrating sample magnetometer. Ferrites decomposed to FeO and MnO after annealing above 400 degrees C in nitrogen; thus it is the optimum annealing temperature to attain the desired permeability. (c) 2012 Elsevier B.V. All rights reserved.
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