한국자기학회

Anh-Than Le(Department of Materials Engineering, Chungnam National University), Nguyen Duy Ha(Department of Materials Engineering, Chungnam National University), Chong-Oh Kim(Department of Materials Engineering, Chungnam National University), Jang-Roh Rhee(Department of Physics, Sookmyung Women's University), Nguyen Chau(Center for Materials Science, National University of Hanoi), Nguyen Quang Hoa(Center for Materials Science, National University of Hanoi), Nguyen Due Tho(Center for Materials Science, National University of Hanoi), Hee-Bok Lee*

(Department of Physics Education, Kongju National University)

Abstract

The effect of annealing temperature on the permeability and giant magneto-impedance (GMI) behaviors of Fe_68.5Mn₅Si_13.5B₉Nb₃Cu₁amorphous alloy has been systematically investigated. The nanocrystalline Fe_68.5Mn₅Si_13.5B₉Nb₃Cu₁alloys consisting of ultra-fine(Fe,Mn)₃Si grains embedded in an amorphous matrix were obtained by annealing their precursor alloy at the temperature range from 500℃ to 600℃ for 1 hour in vacuum. The permeability and GMI profiles were measured as a function of external magnetic field. It was found that the increase of both the permeability and the GMI effect with increasing annealing temperature up to 535℃ was observed and ascribed to the ultrasoft magnetic properties in the sample, whereas an opposite tendency was found when annealed at 600℃ which is due to the microstructural changes caused by high-temperature annealing. The study of temperature dependence on the permeability and GMI effect showed some insights into the nature of the magnetic exchange coupling between nanocrystallized grains through the amorphous boundaries in nanocrystalline magnetic materials.

Keywords: magnetoimpedance; amorphous; nanocrystalline materials; annealing; incremental permeability

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