Magnetic field dependent small-angle neutron scattering on a Co nanorod array : evidence for intraparticle spin misalignment
The structural and magnetic properties of a cobalt nanorod array have been studied by means of magnetic field dependent small-angle neutron scattering (SANS). Measurement of the unpolarized SANS cross section dΣ/dΩ of the saturated sample in the two scattering geometries where the applied magnetic f...
| Publié dans: | Journal of applied crystallography. - 1998. - 47(2014), Pt 3 vom: 01. Juni, Seite 992-998 |
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| Auteur principal: | |
| Autres auteurs: | , , , , , , , , |
| Format: | Article |
| Langue: | English |
| Publié: |
2014
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| Accès à la collection: | Journal of applied crystallography |
| Sujets: | Journal Article magnetic materials magnetism nanorods small-angle neutron scattering |
| Résumé: | The structural and magnetic properties of a cobalt nanorod array have been studied by means of magnetic field dependent small-angle neutron scattering (SANS). Measurement of the unpolarized SANS cross section dΣ/dΩ of the saturated sample in the two scattering geometries where the applied magnetic field H is either perpendicular or parallel to the wavevector ki of the incoming neutron beam allows one to separate nuclear from magnetic SANS, without employing the usual sector-averaging procedure. The analysis of the SANS data in the saturated state provides structural parameters (rod radius and centre-to-centre distance) that are in good agreement with results from electron microscopy. Between saturation and the coercive field, a strong field dependence of dΣ/dΩ is observed (in both geometries), which cannot be explained using the conventional expression of the magnetic SANS cross section of magnetic nanoparticles in a homogeneous nonmagnetic matrix. The origin of the strong field dependence of dΣ/dΩ is believed to be related to intradomain spin misalignment, due to magnetocrystalline and magnetoelastic anisotropies and magnetostatic stray fields |
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| Description: | Date Revised 21.03.2024 published: Electronic-eCollection Citation Status PubMed-not-MEDLINE |
| ISSN: | 0021-8898 |