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Evolution of Free Volume in Ultrasoft Magnetic FeZrN Films during Thermal Annealing

Published online by Cambridge University Press:  01 February 2011

N.G. Chechenin ,
A. van Veen ,
H. Schut ,
A.R. Chezan ,
D.O. Boerma ,
T. Vystavel  and
J.Th.M. De Hosson
N.G. Chechenin
Affiliation:
Materials Science Centre, University of Groningen, Groningen, The Netherlands
A. van Veen
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Delft, The Netherlands
H. Schut
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Delft, The Netherlands
A.R. Chezan
Affiliation:
Materials Science Centre, University of Groningen, Groningen, The Netherlands
D.O. Boerma
Affiliation:
Materials Science Centre, University of Groningen, Groningen, The Netherlands
T. Vystavel
Affiliation:
Materials Science Centre, University of Groningen, Groningen, The Netherlands
J.Th.M. De Hosson
Affiliation:
Materials Science Centre, University of Groningen, Groningen, The Netherlands
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Abstract

The thermal stability of nanocrystalline ultra-soft magnetic (Fe98Zr2)1-xNx films with x=0.10-0.25 was studied using high-resolution transmission electron microscopy (HRTEM), positron beam analysis (PBA) and thermal desorption spectrometry (TDS). The results demonstrate that grain growth during the heat treatment is accompanied by an increase of the free volume, by nitrogen reallocation and desorption. All this can drastically deteriorate the ultra-soft magnetic properties. The desorption starts already at slightly elevated temperatures, below 100°C. However, most of the nitrogen leaves the sample at a temperature above 500°C.

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