Hyperfine field relaxations in the Fe−Co−B amorphous alloys |
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Authors: | T Zemčík |
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Institution: | (1) Institute of Physical Metallurgy, Czechoslovak Academy of Sciences, Žižkova 22, CS-616 62 Brno, Czechoslovakia |
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Abstract: | A systematic increase of the average hyperfine magnetic induction at57Fe measured at room temperature during interrupted isothermal annealing was found to be inherent to the irreversible relaxation
processes in the Fe−B based soft magnetic alloys at moderately elevated temperatures. Assuming superimposed asymptotic exponential
field vs. time dependences. several processes can be distinguished, their relaxation times determined and from the Arrhenius-like
log τ vs. 1/T plots average activation enthalpies estimated. Results on the Fe70Co10B20 and Fe85−x
Co
x
B15 (x=17, 19 and 21 at. % Co) amorphous ribbons between 100 and 200°C are compared and discussed in terms of possible stress relief,
free volume annihilation and short range ordering mechanisms. |
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Keywords: | |
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