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| AFM Study and Magnetic Properties of Nanocrystalline Fe73.5-sCrsSi13.5B9Nb3Au1 (x = 1~5) Alloys |
| Journal of Magnetics, Volume 11, Number 1, 31 Mar 2006, Pages 43-50 |
Anh-Than Le(Department of Materials Engineering, Chungnam National University), Nguyen Chau(Center for Materials Science, National University of Hanoi), Nguyen Duy Cuong(Department of Materials Engineering, Chungnam National University), Ngo Duc The(Center for Materials Science, National University of Hanoi), Chong-Oh Kim(Department of Materials Engineering, Chungnam National University), Jang-Roh Rhee(Department of Physics, Sookmyung Womens University), Hee-Bok Lee*  (Department of Physics Education, Kongju National University) |
| Abstract |
| In this paper, the influences of microstructural and surface morphological developments on the soft magnetic properties and giant magneto-impedance (GMI) effect of the Fe73.5-sCrsSi13.5B9Nb3Au1(x = 1, 2, 3, 4, 5) alloys have been presented. It was found that the Cr addition slightly decreased the mean grain size of grains. AFM results indicate a large variation of surface morphology of density and size of protrusions along the ribbon plane due to microstructural changes caused by thermal annealing with increasing Cr content. Ultrasoft magnetic properties of the nanocrystallized samples were noticeably enhanced by properly heat treatments at Ta=540℃ such as an increase of the magnetic permeability and the decrease of coercivity, which is likely due to the formation of nanoscale α-Fe(Si) phase which reduced the magnetoelastic anisotropy of samples. Accordingly, the GMI effect was observed in the annealed samples. The correlation between the microstructure, surface morphology, and soft magnetic properties were explained by nucleation and growth model. |
| Keywords: AFM; surface topography; microstructure; magnetic properties; nanocrystalline alloys |
| DOI: |
| Full Text: PDF |
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