[Zurück]

J. Cieslak, B.F.O. Costa, S.M. Dubiel, M. Reissner, W. Steiner:
"Magnetic properties of nanocrystalline σ-FeCr alloy";
Journal of Physics: Condensed Matter, 17 (2005), S. 2985 - 2992.

Magnetic properties of a nanocrystalline σ-FeCr alloy

J Cieslak 1, B F O Costa 2, S M Dubiel 1,4, M Reissner 3 and W Steiner 3

1 Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Krakow, Poland
2 Department of Physics, University of Coimbra, 3000-516 Coimbra, Portugal
3 Institute of Solid State Physics, Vienna University of Technology, 1040 Wien, Austria

4 Author to whom any correspondence should be addressed
E-mail: dubiel@novell.ftj.agh.edu.pl

Received 28 January 2005, in final form 15 March 2005
Published 29 April 2005
Print publication: Issue 19 (18 May 2005)

Abstract. Magnetic properties of a nanocrystalline σ-Fe55.4Cr44.6 alloy were investigated by means of Mössbauer spectroscopy and vibrating sample magnetometry both as a function of temperature (4 K <= T <= 300 K) and, for the latter, also as a function of external magnetic field (Ba <= 15 T). The methods used enabled us to determine the mean Curie temperature, {TC}~57 K, and the average magnetic moment per Fe atom, {μ}=0.34μB, as well as to find that the sample behaves like an ensemble of interacting superparamagnetic particles. Comparison of these results with our recent corresponding investigations on microcrystalline σ-Fe100-xCrx alloys with 45<= x <= 50 shows that the ratio between the average hyperfine field, {B}, and {μ} for the nanocrystalline sample fits well to that of the microcrystalline ones of similar composition. The non-linear {B}-{μ} relationship points to composition-dependent valence hyperfine field contributions.

doi:10.1088/0953-8984/17/19/012
URL: http://stacks.iop.org/0953-8984/17/2985
PII: S0953-8984(05)93935-0

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* References

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937905

http://www.iop.org/EJ/abstract/0953-8984/17/19/012