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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| Authors: | AP Srivastava D Srivastava K Sudarshan SK Sharma PK Pujari B Majumdar KG Suresh GK Dey |
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| Institution: | 1. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India;3. Defense Metallurgical Research Laboratory, Hyderabad 500058, India;4. Physics Department, Indian Institute of Technology, Bombay, Mumbai 400076, India |
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| Abstract: | 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. |
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| Keywords: | Positron lifetime Metallic glass Amorphous Medium range order Soft magnetic property |
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