Observation of cross-shaped anisotropy in spin-resolved small-angle neutron scattering
| Autor: | Andreas Michels, Charles Dewhurst, A. Heinemann, Dirk Honecker, Kiyonori Suzuki, Frank Döbrich |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Condensed matter physics Scattering Physics [G04] [Physical chemical mathematical & earth Sciences] Neutron scattering Condensed Matter Physics Small-angle neutron scattering Electronic Optical and Magnetic Materials Magnetic field Amorphous solid Nuclear magnetic resonance Physique [G04] [Physique chimie mathématiques & sciences de la terre] Density contrast Anisotropy Saturation (magnetic) |
| Popis: | 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 $1.27\phantom{\rule{0.28em}{0ex}}\mathrm{T}$ we observe a cross-shaped angular anisotropy in the non-spin-flip SANS cross section ${\ensuremath{\Sigma}}^{++}$. This feature---for this class of materials only visible at saturation in ${\ensuremath{\Sigma}}^{++}$---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. |
| Databáze: | OpenAIRE |
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