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A small angle neutron scattering and Mössbauer spectrometry study of magnetic structures in nanocrystalline Ni3Fe

Frase, H. N. and Fultz, B. and Spooner, S. and Robertson, J. L. (1999) A small angle neutron scattering and Mössbauer spectrometry study of magnetic structures in nanocrystalline Ni3Fe. Journal of Applied Physics, 85 (10). pp. 7097-8004. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:FRAjap99

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Abstract

Results are reported from small angle neutron scattering and Mössbauer spectrometry measurements on nanocrystalline Ni3Fe. The nanocrystalline materials were prepared by mechanical attrition and studied in the as-milled state, after annealing at 265 °C to relieve internal stress, and after annealing 600 °C to prepare a control sample comprising large crystals. The small angle neutron scattering (SANS) measurements were performed for a range of applied magnetic fields. Small differences were found in how the different samples reached magnetic saturation. From the SANS data obtained at magnetic saturation, we found little difference in the nuclear scattering of the as-milled material and the material annealed at 265 °C. Reductions in nuclear scattering and magnetic scattering were observed for the control sample, and this was interpreted as grain growth. The material annealed at 265 °C also showed a reduction in magnetic SANS compared to the as-milled material. This was interpreted as an increase in magnetic moments of atoms at the grain boundaries after a low temperature annealing. Both Mössbauer spectroscopy and small angle neutron scattering showed an increase in the grain boundary magnetic moments after the 265 °C annealing (0.2 and 0.4µB/atom, respectively), even though there was little change in the grain boundary atomic density.


Item Type:Article
Additional Information:©1999 American Institute of Physics. (Received 1 October 1998; accepted 14 February 1999) The Oak Ridge National Laboratory is managed for the Department of Energy by Lockheed Martin Energy Research, Oak Ridge, TN under Contract No. DE-AC05-96OR22464. This work was supported by the U.S. Department of Energy under Contract No. DE-FG03-96ER45572.
Subject Keywords:NICKEL ALLOYS; IRON ALLOYS; NEUTRON DIFFRACTION; MOESSBAUER EFFECT; MAGNETIC MOMENTS; ANNEALING; GRAIN BOUNDARIES; STRESSES; MAGNETIC FIELDS; SMALL ANGLE SCATTERING; nanostructured materials; magnetic particles; magnetic structure; Mossbauer effect
Record Number:CaltechAUTHORS:FRAjap99
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:FRAjap99
Alternative URL:http://dx.doi.org/10.1063/1.370517
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1983
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:28 Feb 2006
Last Modified:26 Dec 2012 08:47

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