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Correlation of soft magnetic properties with free volume and medium range ordering in metallic glasses probed by fluctuation microscopy and positron annihilation technique

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Title Correlation of soft magnetic properties with free volume and medium range ordering in metallic glasses probed by fluctuation microscopy and positron annihilation technique
 
Creator SRIVASTAVA, AP
SRIVASTAVA, D
SUDARSHAN, K
SHARMA, SK
PUJARI, PK
MAJUMDAR, B
SURESH, KG
DEY, GK
 
Subject Positron lifetime
Metallic glass
Amorphous
Medium range order
Soft magnetic property
ZR AMORPHOUS-ALLOYS
MECHANICAL-PROPERTIES
ATOMIC PACKING
WHEEL SPEED
RIBBONS
NANOCRYSTALLIZATION
TRANSITION
EVOLUTION
MODEL
SPECTROSCOPY
 
Description Amorphous ribbons of different thicknesses of Co64.5Fe3.5Si16B14Ni2 alloy were synthesized using the melt spinning technique by varying wheel speed. The effect of cooling rate on the ribbon thickness and their soft magnetic properties have been studied. The amorphous structure has been characterized in terms of structural free volume and medium range order (MRO) by positron annihilation spectroscopy and fluctuation electron microscopy techniques. Positron lifetime spectra of amorphous samples showed two lifetime components. The first component was found to be correlated with MRO whereas, the second lifetime component was found to be associated with nanovoid type of defects, and the second component was strongly dependent on processing conditions. It could be established that the coercivity of the amorphous samples produced by the rapid solidification technique mainly depends on the defects formed during processing rather than change induced in MRO. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-14T17:30:52Z
2014-10-14T17:30:52Z
2012
 
Type Article
 
Identifier JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 324(16)2476-2482
http://dx.doi.org/10.1016/j.jmmm.2012.03.014
http://dspace.library.iitb.ac.in/jspui/handle/100/14573
 
Language en