Abstract
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.
Highlights
Small-angle neutron scattering (SANS) has been recognized as a powerful experimental technique to characterize permanent magnet materials[1,2] such as Nd2Fe14B single crystal[3], Nd-Fe-B sintered magnets[4,5,6], hot-deformed nanocrystalline magnets[7,8,9,10], and nanocomposites[11,12]
The scattering probability is proportional to the scattering cross-section of the material, and multiple scattering becomes noticeable for strongly scattering thick samples[13,14]
We have investigated the influence of multiple scattering on the magnetic small-angle neutron scattering (SANS) from a Nd-Fe-B nanocrystalline magnet
Summary
Small-angle neutron scattering (SANS) has been recognized as a powerful experimental technique to characterize permanent magnet materials[1,2] such as Nd2Fe14B single crystal[3], Nd-Fe-B sintered magnets[4,5,6], hot-deformed nanocrystalline magnets[7,8,9,10], and nanocomposites[11,12]. Considering the Molière’s theory of multiple small-angle scattering, it is important to check the dependence of sample thickness on the mean free path of the neutrons.
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