Multiple magnetic scattering in small-angle neutron scattering of Nd–Fe–B nanocrystalline magnet
نویسندگان
چکیده
We have investigated the influence of multiple scattering on the magnetic small-angle neutron scattering (SANS) from a Nd-Fe-B nanocrystalline magnet. We performed sample-thickness- and neutron-wavelength-dependent SANS measurements, and observed the scattering vector dependence of the multiple magnetic scattering. It is revealed that significant multiple scattering exists in the magnetic scattering rather than the nuclear scattering of Nd-Fe-B nanocrystalline magnet. It is considered that the mean free path of the neutrons for magnetic scattering is rather short in Nd-Fe-B magnets. We analysed the SANS data by the phenomenological magnetic correlation model considering the magnetic microstructures and obtained the microstructural parameters.
منابع مشابه
Analysis of the small-angle neutron scattering of nanocrystalline ferromagnets using a micromagnetics model
In ferromagnets with a nonuniform magnetocrystalline and/or magnetoelastic anisotropy, such as nanocrystalline ~nc-! or cold-worked ~cw-! polycrystalline materials, the static magnetic microstructure gives rise to strong elastic magnetic small-angle neutron scattering ~SANS!. The paper explores a method for analyzing field-dependent SANS data from such materials in terms of a model based on the...
متن کاملابررساناهای دمای بالا- با دید نوترونها
Neutron scattering is proved to be a vital probe in unveiling the magnetic properties of high temperature superconductors (HTSC). Detailed information about the energy and momentum dependence of the magnetic dynamics of HTSC have been obtained directly by this technique. Over the past decade by improving the crystal growth methods, large and high quality single crystals of HTSC, which are ess...
متن کاملSmall-Angle Neutron Scattering by the Magnetic Microstructure of Nanocrystalline Ferromagnets Near Saturation
R. D. Shull National Institute of Standards and Technology, Gaithersburg, MD 20899-0001, USA The paper presents a theoretical analysis of elastic magnetic small-angle neutron scattering (SANS) due to the nonuniform magnetic microstructure in nanocrystalline ferromagnets. The reaction of the magnetization to the magnetocrystalline and magnetoelastic anisotropy fields is derived using the theory ...
متن کاملAb initio calculations as a quantitative tool in the inelastic neutron scattering study of a single-molecule magnet analogue.
Ab initio calculations carried out on the Tb analogue of the single-molecule magnet family Na9[Ln(W5O18)2] (Ln = Nd, Gd, Ho and Er) have allowed interpretation of the inelastic neutron scattering spectra. The combined experimental and theoretical approach sheds new light on the sensitivity of the electronic structure of the Tb(III) ground and excited states to small structural distortions from ...
متن کاملSmall Angle Neutron Scattering Measurements of Magnetic Cluster Sizes in Magnetic Recording Disks
We describe Small Angle Neutron Scattering measurements of the magnetic cluster size distributions for several longitudinal magnetic recording media. We nd that the average magnetic cluster size is slightly larger than the average physical grain size, that there is a broad distribution of cluster sizes, and that the cluster size is inversely correlated to the media signal-to-noise ratio. These ...
متن کامل