Neutron scattering—The key characterization tool for nanostructured magnetic materials

Fitzsimmons, M. R.; Schuller, Iván K.

doi:10.1016/j.jmmm.2013.09.028

Cited by 36 publications

(17 citation statements)

References 60 publications

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“…On the other hand, the analysis of XRMS spectra is more intricate than the analysis of PNR scans because the latter method is based on resonance absorption of circular polarized x-rays, which cannot be treated by the more simple Born approximation or distorted wave Born approximation. For more information on the fundamentals of PNR and XRMS we refer to a number of excellent reviews articles 5,14,15,[17][18][19][25][26][27] .…”

Section: Discussionmentioning

confidence: 99%

Artificial Magnetic Pattern Arrays Probed by Polarized Neutron Reflectivity

Gorkov

Toperverg

Zabel

2020

Preprint

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Traditionally, neutron scattering is an essential method for the analysis of spin structures and spin excitations in bulk materials. Over the last 30 years, polarized neutron scattering in terms of reflectometry has also contributed largely to the analysis of magnetic thin films and magnetic multilayers. More recently it has been shown that polarized neutron reflectivity is, in addition, a suitable tool for the study of thin films laterally patterned with magnetic stripes or islands. We provide a brief overview of the fundamental properties of polarized neutron reflectivity, considering different domain states, domain fluctuations, and different domain sizes with respect to the neutron coherence volume. The discussion is exemplified by a set of simulated reflectivities assuming either complete polarization and polarization analysis, or a reduced form of polarized neutron reflectivity without polarization analysis. Furthermore, we emphasize the importance of the neutron coherence volume for the interpretation of specular and off-specular intensity maps, in particular when studying laterally non-homogeneous magnetic films. Finally, experimental results, fits, and simulations are shown for specular and off-specular scattering from a magnetic film that has been lithographically patterned into a periodic stripe array. These experiments demonstrate the different and mutually complementary information that can be gained when orienting the stripe array parallel or perpendicular to the scattering plane.

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Section: Discussionmentioning

confidence: 99%

Artificial Magnetic Pattern Arrays Probed by Polarized Neutron Reflectivity

Gorkov

Toperverg

Zabel

2020

Preprint

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“…The SLD profile corresponding to a given polarised neutron reflectivity pattern is comprised of a nuclear and magnetic component, ρ ± = ρ n + ρ m = ρ n ± C i N i µ i where ρ n and ρ m is the nuclear and magnetic SLD, C = 2.645 fm µ −1 B , N i is the number density of the ith atom, µ i is the magnetic moment of the ith atom in Bohr magnetons. The magnetic SLD is added or subtracted from the nuclear SLD depending on whether the spin of the incident neutron is parallel or anti-parallel to the magnetisation of the sample [38].…”

Section: A Sample Growthmentioning

confidence: 99%

Field dependence of the ferromagnetic/superconducting proximity effect in a YBCO/STO/LCMO multilayer

et al. 2018

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The interaction between superconductivity and magnetism in spatially confined heterostructures of thin film multilayers is investigated in the ferromagnetic manganite La2/3Ca1/3MnO3 (LCMO) and the high-temperature superconductor YBa2Cu3O7-δ (YBCO) mediated by an intermediate insulating SrTiO3 (STO) layer. The STO layer is used to mediate and tune the range of interactions between the ferromagnet and superconductor. A magnetically depleted layer with zero-magnetisation within the LCMO layer is shown by polarised neutron reflectometry measurements. This zero-magnetisation layer is caused by the onset of superconductivity in YBCO despite being separated by an insulating layer with a thickness much larger than the superconducting coherence length. The magnetic field dependence of this interaction is also explored. We show that the magnetism of the depleted layer can be restored by applying a magnetic field that partially destroys the superconductivity in YBCO, restricting the electronic interaction between the materials.

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“…Novel exchange bias phenomena are manifested as a shift of a single hysteresis loop or a double-hysteresis loop. Overall, while the exchange-bias effect has been successfully utilized in commercial electronics, there lacks a unified mechanism to explain their origins, which can be system-specific [77]. In this section, we focus on the interfacial exchange coupling in two systems, SrRuO 3 oriented SrTiO 3 substrate, Ke et al [76] found that the magnetization of the LSMO layer is positively biased by the SRO layer.…”

Section: Novel Magnetic Couplingmentioning

confidence: 99%

Interfacial magnetism in complex oxide heterostructures probed by neutrons and x-rays

Liu¹,

Ke²

2015

J. Phys.: Condens. Matter

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Magnetic complex-oxide heterostructures are of keen interest because a wealth of phenomena at the interface of dissimilar materials can give rise to fundamentally new physics and potentially valuable functionalities. Altered magnetization, novel magnetic coupling and emergent interfacial magnetism at the epitaxial layered-oxide interfaces are under intensive investigation, which shapes our understanding on how to utilize those materials, particularly for spintronics. Neutron and x-ray based techniques have played a decisive role in characterizing interfacial magnetic structures and clarifying the underlying physics in this rapidly developing field. Here we review some recent experimental results, with an emphasis on those studied via polarized neutron reflectometery and polarized x-ray absorption spectroscopy. We conclude with some perspectives.

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Neutron scattering—The key characterization tool for nanostructured magnetic materials

Cited by 36 publications

References 60 publications

Artificial Magnetic Pattern Arrays Probed by Polarized Neutron Reflectivity

Artificial Magnetic Pattern Arrays Probed by Polarized Neutron Reflectivity

Field dependence of the ferromagnetic/superconducting proximity effect in a YBCO/STO/LCMO multilayer

Interfacial magnetism in complex oxide heterostructures probed by neutrons and x-rays

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