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A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe89Zr7B3Cu1

Published online by Cambridge University Press:  10 February 2011

Enrico Agosti ,
Oscar Moze ,
John Cadogan ,
Kiyonori Suzuki ,
Andre Heinemann  and
Armen Hoell
Enrico Agosti
Affiliation:
INFM - S3, Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Italy.
Oscar Moze
Affiliation:
INFM - S3, Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Italy.
John Cadogan
Affiliation:
INFM - S3, Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Italy.
Kiyonori Suzuki
Affiliation:
School of Physics, University of New South Wales, Sydney, Australia.
Andre Heinemann
Affiliation:
Berlin Neutron Scattering Centre, Hahn Meitner Institut, Berlin, Germany.
Armen Hoell
Affiliation:
School of Physics, University of New South Wales, Sydney, Australia.
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Abstract

The technique of small angle neutron scattering (SANS) is ideally suited for determining the length scale of magnetic correlations in nanocrystalline materials. The additional use of polarized neutrons also allows for a clear separation between magnetic and non-magnetic scattering. The temperature dependence of the SANS cross-section from a two-phase alloy, consisting of both amorphous and nano-crystalline parts, Fe89Zr7B3Cu1, has been measured in the temperature range from 293 to 500 K. The SANS measurements are accompanied by bulk magnetization and Mössbauer transmission data. In this range of temperatures, the magnetic contrast between the nanocrystalline and amorphous phases, which are both magnetic, changes dramatically. This phase contrast increases up to 380 K, which is the proposed decoupling temperature for the inter-granular exchange stiffness. Above this temperature, the contrast levels off slowly, being totally dominated by the decreasing magnetization of the nanocrystalline phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 746: Symposia Q/R – Magnetoelectronics-Novel Magnetic Phenomena in Nanostructures – Advanced Characterization of Artificially Structured Magnetic Materials , 2002 , R3.9
Copyright
Copyright © Materials Research Society 2003

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References

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