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Enhanced magnetoimpedance and field sensitivity in microstructure controlled FeSiCuNbB ribbons
, M. Srinivas
Published in
2011
Volume: 110
   
Issue: 8
Abstract
Fe73.5Si13.5Cu1Nb3B9 and Fe77.2Si11.2Cu0.8Nb3.3B 7.5 nanocomposite materials consisting of nanocrystalline phase in an amorphous matrix were obtained by heat-treatment of their precursor amorphous ribbons. The influence of structural modifications induced during the heat-treatment on soft magnetic properties and magnetoimpedance (MI) effect have been studied. The structural investigations on both these ribbons revealed the presence of two phases, fine grained Fe3Si phase and a residual amorphous phase on heat-treatment. The maximum MI ratio obtained in the present study is 95 at f 4 MHz, for the optimized heat-treated Fe77.2Si 11.2Cu0.8Nb3.3B7.5 ribbon. This is ascribed to the increase in magnetic permeability and decrease in coercive force and intrinsic resistivity. Moreover, a maximum magnetic field sensitivity (ζ) of 8.3/Oe at f 2.5 MHz is obtained, for the optimized nanocrystalline Fe73.5Si13.5Cu1Nb3B9 ribbon. This suggests that tailoring of the nanocrystalline microstructures induced by optimum heat-treatment conditions can result in obtaining excellent combinations of the magnetic permeability and resistivity. Our results indicate that these Fe-based nanocrystalline materials can be ideally used for low magnetic field and high frequency sensor applications. © 2011 American Institute of Physics.
About the journal
JournalJournal of Applied Physics
ISSN00218979
Open AccessNo
Concepts (27)
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    Amorphous matrices
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    Amorphous ribbon
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    FIELD SENSITIVITY
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    Fine grained
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    HIGH FREQUENCY SENSORS
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    INTRINSIC RESISTIVITY
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    Low magnetic fields
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    MAGNETIC FIELD SENSITIVITY
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    MAGNETO-IMPEDANCE
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    MAGNETO-IMPEDANCE EFFECTS
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    NANOCRYSTALLINE MICROSTRUCTURES
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    NANOCRYSTALLINE PHASE
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    Nanocrystallines
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    RESIDUAL AMORPHOUS PHASE
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    SOFT MAGNETIC PROPERTIES
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    Structural investigation
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    Structural modifications
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    Amorphous silicon
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    Magnetic fields
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    Magnetic permeability
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    Microstructure
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    Nanocomposites
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    Nanocrystalline materials
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    Optimization
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    Permanent magnets
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    Silicon
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    Amorphous materials