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Keywords = polarized grazing-incidence small-angle neutron scattering

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19 pages, 17285 KiB  
Article
Mesostructure and Magnetic Properties of SiO2-Co Granular Film on Silicon Substrate
by Natalia A. Grigoryeva, Victor Ukleev, Alexey A. Vorobiev, Alexander I. Stognij, Nikolay N. Novitskii, Leonid V. Lutsev and Sergey V. Grigoriev
Magnetochemistry 2022, 8(12), 167; https://doi.org/10.3390/magnetochemistry8120167 - 24 Nov 2022
Cited by 2 | Viewed by 2266
Abstract
Granular films SiO2(Co) exhibit unusual magnetic and magnetotransport properties which are strongly dependent on the composition of the film and material of a substrate. For example, the injection magnetoresistance (IMR) coefficient reaches a giant (GIMR) value of 105% at [...] Read more.
Granular films SiO2(Co) exhibit unusual magnetic and magnetotransport properties which are strongly dependent on the composition of the film and material of a substrate. For example, the injection magnetoresistance (IMR) coefficient reaches a giant (GIMR) value of 105% at room temperature in SiO2(Co) films on an n-GaAs substrate. However, the IMR effect is negligible in the case of a similar granular film deposited on the n-Si substrate. In this report, the structural and magnetic properties of granular film SiO2(Co) on Si substrate are studied with the aim to understand the cause of the difference in IMR coefficients for SiO2(Co) thin film deposited on n-GaAs and on n-Si substrates. Investigations were carried out using complementary methods of Polarized Neutron Reflectometry, Grazing Incidence Small-Angle X-ray Scattering, X-ray Reflectometry, Scanning Electron Microscope, and SQUID magnetometry. It is shown that the interface layer between the granular film and Si substrate exhibits metallic rather than magnetic properties and eliminates the GIMR effect. This interface layer is associated with the Si diffusion to Co nanoparticles and the formation of the metallic cobalt silicides. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Films and Nanostructures)
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21 pages, 6688 KiB  
Article
Advanced Small-Angle Scattering Instrument Available in the Tokyo Area. Time-Of-Flight, Small-Angle Neutron Scattering Developed on the iMATERIA Diffractometer at the High Intensity Pulsed Neutron Source J-PARC
by Satoshi Koizumi, Yohei Noda, Tomoki Maeda, Takumi Inada, Satoru Ueda, Takako Fujisawa, Hideki Izunome, Robert A. Robinson and Henrich Frielinghaus
Quantum Beam Sci. 2020, 4(4), 42; https://doi.org/10.3390/qubs4040042 - 2 Dec 2020
Cited by 16 | Viewed by 4741
Abstract
A method of time-of-flight, small-angle neutron scattering (TOF-SANS) has been developed based on the iMATERIA powder diffractometer at BL20, of the Materials and Life Sciences Facility (MLF) at the high-intensity proton accelerator (J-PARC). A large-area detector for SANS, which is composed of triple-layered [...] Read more.
A method of time-of-flight, small-angle neutron scattering (TOF-SANS) has been developed based on the iMATERIA powder diffractometer at BL20, of the Materials and Life Sciences Facility (MLF) at the high-intensity proton accelerator (J-PARC). A large-area detector for SANS, which is composed of triple-layered 3He tube detectors, has a hole at its center in order to release a direct beam behind and to detect ultra-small-angle scattering. As a result, the pulsed-neutron TOF method enables us to perform multiscale observations covering 0.003 < q (Å−1) < 40 (qmax/qmix = 1.3 × 104) and to determine the static structure factor S(q) and/or form factor P(q) under real-time and in-situ conditions. Our challenge, using unique sample accessories of a super-conducting magnet and polarized neutron, is dynamic nuclear polarization (DNP) for contrast variation, especially for industrial use. To reinforce conventional SANS measurements with powder materials, grazing-incidence small-angle neutron scattering (GISANS) or reflectivity is also available on the iMATERIA instrument. Full article
(This article belongs to the Special Issue New Trends in Neutron Instrumentation)
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13 pages, 837 KiB  
Article
Coherent Magnetization Rotation of a Layered System Observed by Polarized Neutron Scattering under Grazing Incidence Geometry
by Ryuji Maruyama, Thierry Bigault, Thomas Saerbeck, Dirk Honecker, Kazuhiko Soyama and Pierre Courtois
Crystals 2019, 9(8), 383; https://doi.org/10.3390/cryst9080383 - 26 Jul 2019
Cited by 8 | Viewed by 3757
Abstract
The in-plane magnetic structure of a layered system composed of polycrystalline grains smaller than the ferromagnetic exchange length was studied to elucidate the mechanism controlling the magnetic properties considerably different from the bulk using polarized neutron scattering under grazing incidence geometry. The measured [...] Read more.
The in-plane magnetic structure of a layered system composed of polycrystalline grains smaller than the ferromagnetic exchange length was studied to elucidate the mechanism controlling the magnetic properties considerably different from the bulk using polarized neutron scattering under grazing incidence geometry. The measured result, together with quantitative analysis based on the distorted wave Born approximation, showed that the in-plane length of the area with a uniform orientation of moments ranging from 0.5–1.1 μ m was not significantly varied during the process of demagnetization followed by remagnetization. The obtained behavior of moments is in good agreement with the two-dimensional random anisotropy model where coherent magnetization rotation is dominant. Full article
(This article belongs to the Special Issue Investigation of Nanostructures with X-ray Scattering Techniques)
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