A small angle polarized neutron scattering investigation of magnetic correlations in nanocrystalline Fe89Zr7B3Cu1

Enrico Agosti, Oscar Moze, John Cadogan, Kiyonori Suzuki, Andre Heinemann, Armen Hoell

Research output: Contribution to journalConference articleOther

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.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume746
Publication statusPublished - 1 Dec 2002
EventMagnoelectronics and Magnetic Materials - Novel Phenomena and Advanced Characterization - Boston, MA, United States of America
Duration: 1 Dec 20025 Dec 2002

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