Observation of cross-shaped anisotropy in spin-resolved small-angle neutron scattering

We report the results of spin-resolved small-angle neutron scattering (SANS) experiments on the two-phase nanocrystalline alloy NANOPERM. At a saturating applied magnetic field of 1.27 T we observe a cross-shaped angular anisotropy in the non-spin-flip SANS cross section capital sigma super(++). Thi...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-05, Vol.85 (18), Article 184417
Main Authors: Michels, Andreas, Honecker, Dirk, Döbrich, Frank, Dewhurst, Charles D., Suzuki, Kiyonori, Heinemann, André
Format: Article
Language:English
Subjects:
Anisotropy
Condensed matter
Cross sections
Density
Magnetic fields
Neutron scattering
Styrene acrylonitrile resins
Unity
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Summary:We report the results of spin-resolved small-angle neutron scattering (SANS) experiments on the two-phase nanocrystalline alloy NANOPERM. At a saturating applied magnetic field of 1.27 T we observe a cross-shaped angular anisotropy in the non-spin-flip SANS cross section capital sigma super(++). This feature-for this class of materials only visible at saturation in capital sigma super(++)-is attributed to the specific ratio of nuclear to magnetic scattering being smaller than unity. Analysis of the non-spin-flip and spin-flip cross sections provides the nuclear and magnetic SANS and allows us to estimate the magnitude of the respective scattering-length density contrast at the interphase between the nanoparticles and the amorphous magnetic matrix.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.85.184417