Grazing incidence polarized neutron scattering in reflection geometry from nanolayered spintronic systems

Paul, Amitesh

doi:10.1007/s12043-011-0207-z

Cited by 13 publications

(4 citation statements)

References 137 publications

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“…Details on the technique and a corresponding review can be found elsewhere. 23 In the experiment, four different cross sections are measured, namely, non-spin-flip (NSF) (R ++ and R −− ) and spin-flip (SF) (R +− and R −+ ) channels . Here, the subscripts + and − designate polarizations of the neutron beam parallel or antiparallel to the guide field, respectively.…”

Section: Polarized Neutron Scatteringmentioning

confidence: 99%

Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

Paul

Jutimoosik

et al. 2013

Phys. Rev. B

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We report on the effect of nonmagnetic spacer layers on the interface magnetism and the exchange bias in the archetypical [Co/CoO] 16 system. The separation of the magnetic bilayers by Au layers with various thicknesses d Au 25 nm leads to a threefold increase of the exchange bias field (H eb). Reflectometry with polarized neutrons does not reveal any appreciable change in the domain population. This result is in agreement with the observation that the granular microstructure within the [Co/CoO] bilayers is independent of d Au. The significant reduction of the magnetic moments in the Co layers can be attributed to interfacial disorder at the Co-Au interfaces. Element-specific x-ray absorption spectroscopy attributes part of the enhancement of H eb to the formation of Co 3 O 4 in the [Co/CoO] bilayers within the multilayers. A considerable proportion of the increase of H eb can be attributed to the loss of magnetization at each of the Co-Au interfaces with increasing d Au. We propose that the interfacial magnetism of ferro-and antiferromagnetic layers can be significantly altered by means of metallic spacer layers thus affecting the exchange bias significantly. This study shows that the magnetism in magnetic multilayers can be engineered by nonmagnetic spacer layers without involving the microstructure of the individual layers.

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Section: Polarized Neutron Scatteringmentioning

confidence: 99%

Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

Paul

Jutimoosik

et al. 2013

Phys. Rev. B

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“…Magnetic heterostructures showing a 'horizontal shift' of the hysteresis loop along the field axis have been commonly observed for conventional (Paul, 2012) as well as unconventional bilayer combinations (He et al, 2012;Gibert et al, 2012). However, an uncommonly observed effect of exchange coupling -across an AF-FM interface -is the shift along the magnetization axis or the 'vertical shift' (Hong et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Structural, electronic and magnetic properties of YMnO₃/La_0.7Sr_0.3MnO₃heterostructures

et al. 2014

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Heterostructures with competing magnetic interactions are often exploited for their tailored new functionalities. Exchange bias is one such outcome of interfacial coupling across ferromagnetic–antiferromagnetic, multiferroic–ferromagnetic, two antiferromagnetic, or antiferromagnetic and paramagnetic interfaces. Apart from the usual horizontal shift of the hysteresis loop (exchange bias shift), a small `vertical shift' of the hysteresis loops along the magnetization axis has also been seen, but it was always relatively small. Recently, an unusually large `vertical shift' in epitaxial bilayer heterostructures comprising ferromagnetic La0.7Sr0.3MnO3 and multiferroic orthorhombic YMnO3 layers was reported. Here, using polarized neutron reflectometry, the magnetic proximity effect in such bilayers has been investigated. A detailed magnetic depth profile at the interface, elucidating the intrinsic nature of the vertical shift in such heterostructures, is reported. Further corroboration of this observation has been made by means of first‐principles calculations, and the structural and electronic properties of YMnO3/La0.7Sr0.3MnO3 heterostructures are studied. Although in the bulk, the ground state of YMnO3 is an E‐type antiferromagnet, the YMnO3/La0.7Sr0.3MnO3 heterostructure stabilizes the ferromagnetic phase in YMnO3 in the interface region. It is found that, in the hypothetical ferromagnetic phase of bulk YMnO3, the polarization is suppressed, and owing to a large difference between the lattice constants in the ab plane a strong magnetocrystalline anisotropy is present. This anisotropy produces a high coercivity of the unusual ferromagnetic YMnO3 phase at the interface, which is responsible for the large vertical shift observed in experiment.

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“…The superimposition of two hysteresis loops can be related to the usually observed variation in the cluster (grain) sizes 10 that may have resulted due to their variation with the number of repetitions, along the stack. 9 Vertical correlation of the grains in the stack has been seen to affect the superparamagnetic magnetic behavior for these nanopillar-like structures. 4,11 …”

Section: Resultsmentioning

confidence: 97%

Grazing incidence X-ray scattering showing self-organized regular three-dimensional nanopillar-like structures

Paul

2014

Journal of Applied Physics

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Grazing incidence polarized neutron scattering in reflection geometry from nanolayered spintronic systems

Cited by 13 publications

References 137 publications

Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

Structural, electronic and magnetic properties of YMnO₃/La_0.7Sr_0.3MnO₃heterostructures

Grazing incidence X-ray scattering showing self-organized regular three-dimensional nanopillar-like structures

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Grazing incidence polarized neutron scattering in reflection geometry from nanolayered spintronic systems

Cited by 13 publications

References 137 publications

Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

Change in interface magnetism of an exchange-coupled system due to the presence of nonmagnetic spacers

Structural, electronic and magnetic properties of YMnO3/La0.7Sr0.3MnO3heterostructures

Grazing incidence X-ray scattering showing self-organized regular three-dimensional nanopillar-like structures

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Structural, electronic and magnetic properties of YMnO₃/La_0.7Sr_0.3MnO₃heterostructures