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钴纳米棒阵列上磁场依赖的小角中子散射：颗粒内自旋未对准的证据

Magnetic field dependent small-angle neutron scattering on a Co nanorod array: evidence for intraparticle spin misalignment.

作者信息

Günther A, Bick J-P, Szary P, Honecker D, Dewhurst C D, Keiderling U, Feoktystov A V, Tschöpe A, Birringer R, Michels A

机构信息

Physics and Materials Science Research Unit, University of Luxembourg, 162A Avenue de la Faïencerie, L-1511 Luxembourg, Luxembourg.

Institut Laue-Langevin, 6 Rue Jules Horowitz, BP 156, F-38042 Grenoble Cedex 9, France.

出版信息

J Appl Crystallogr. 2014 May 29;47(Pt 3):992-998. doi: 10.1107/S1600576714008413. eCollection 2014 Jun 1.

DOI:10.1107/S1600576714008413
PMID:24904245
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4038799/
Abstract

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 is either perpendicular or parallel to the wavevector 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.

摘要

通过磁场依赖小角中子散射（SANS）研究了钴纳米棒阵列的结构和磁性。在两种散射几何构型下测量饱和样品的非极化SANS截面dΣ/dΩ，其中施加的磁场要么垂直要么平行于入射中子束的波矢，这使得无需采用通常的扇形平均程序就能将核SANS与磁性SANS区分开来。对饱和状态下的SANS数据进行分析可得到结构参数（棒半径和中心距），这些参数与电子显微镜的结果吻合良好。在饱和状态和矫顽场之间，观察到dΣ/dΩ对磁场有强烈依赖性（在两种几何构型下均如此），这无法用均匀非磁性基质中磁性纳米颗粒的磁性SANS截面的传统表达式来解释。dΣ/dΩ对磁场有强烈依赖性的起源被认为与由于磁晶和磁弹各向异性以及静磁杂散场导致的畴内自旋失准有关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/5d52130f6ab9/j-47-00992-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/3635674c796f/j-47-00992-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/93a838aa11dc/j-47-00992-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/23b5fec30da2/j-47-00992-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/f175635b141c/j-47-00992-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/705b169963fc/j-47-00992-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/064bfacd13c5/j-47-00992-fig6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/5d52130f6ab9/j-47-00992-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/3635674c796f/j-47-00992-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/93a838aa11dc/j-47-00992-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/23b5fec30da2/j-47-00992-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/f175635b141c/j-47-00992-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/705b169963fc/j-47-00992-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/064bfacd13c5/j-47-00992-fig6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a59e/4038799/5d52130f6ab9/j-47-00992-fig7.jpg

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