Highlights from the magnetism reflectometer at the SNS

Lauter, Valeria; Ambaye, Haile; Goyette, R.; Lee, Wai-Tung Hal; Parizzi, A.

doi:10.1016/j.physb.2009.06.021

Cited by 94 publications

(72 citation statements)

References 7 publications

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“…Figure 6 shows the result of PNR measurements conducted at 298 K with a 1 T field applied along the substrate [100] direction. These measurements were performed on the Magnetism Reflectometer at the Spallation Neutron Source, Oak Ridge National Laboratory 55 . Figure 6b shows the measured non-spinflip reflectivity, which indicates clear spin splitting resulting from the magnetization of the sample.…”

Section: Resultsmentioning

confidence: 99%

Polarization screening-induced magnetic phase gradients at complex oxide interfaces

et al. 2015

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Thin-film oxide heterostructures show great potential for use in spintronic memories, where electronic charge and spin are coupled to transport information. Here we use a La 0.7 Sr 0.3 MnO 3 (LSMO)/PbZr 0.2 Ti 0.8 O 3 (PZT) model system to explore how local variations in electronic and magnetic phases mediate this coupling. We present direct, local measurements of valence, ferroelectric polarization and magnetization, from which we map the phases at the LSMO/PZT interface. We combine these experimental results with electronic structure calculations to elucidate the microscopic interactions governing the interfacial response of this system. We observe a magnetic asymmetry at the LSMO/PZT interface that depends on the local PZT polarization and gives rise to gradients in local magnetic moments; this is associated with a metal-insulator transition at the interface, which results in significantly different charge-transfer screening lengths. This study establishes a framework to understand the fundamental asymmetries of magnetoelectric coupling in oxide heterostructures.

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Section: Resultsmentioning

confidence: 99%

Polarization screening-induced magnetic phase gradients at complex oxide interfaces

et al. 2015

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“…The Ir L edges data were collected with a grazing incidence geometry and the fluorescence detection mode. The PNR measurements were performed on the Magnetism Reflectometer (beamline BL-4A)42 at the Spallation Neutron Source of Oak Ridge National Laboratory, and the magnetic depth profile was determined from fitting the neutron spin asymmetry that utilized the chemical model obtain from X-ray reflectometry. The DC transport measurements were performed with a 14 T Quantum Design PPMS with a home-built user bridge.…”

Section: Methodsmentioning

confidence: 99%

Emerging magnetism and anomalous Hall effect in iridate–manganite heterostructures

Nichols¹,

Gao²,

Lee³

et al. 2016

Nat Commun

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Strong Coulomb repulsion and spin–orbit coupling are known to give rise to exotic physical phenomena in transition metal oxides. Initial attempts to investigate systems, where both of these fundamental interactions are comparably strong, such as 3d and 5d complex oxide superlattices, have revealed properties that only slightly differ from the bulk ones of the constituent materials. Here we observe that the interfacial coupling between the 3d antiferromagnetic insulator SrMnO3 and the 5d paramagnetic metal SrIrO3 is enormously strong, yielding an anomalous Hall response as the result of charge transfer driven interfacial ferromagnetism. These findings show that low dimensional spin–orbit entangled 3d–5d interfaces provide an avenue to uncover technologically relevant physical phenomena unattainable in bulk materials.

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“…Depending on the specific NR technique, NR can take advantage of a range of different neutronsample interactions [31]. However, this short review focuses on elastic specular NR, which is by far the most widely used NR technique.…”

Section: The Physics Of Neutron Reflectometry (Nr)mentioning

confidence: 99%

Probing Interfaces in Metals Using Neutron Reflectometry

Demkowicz

Majewski

2016

Metals

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Solid-state interfaces play a major role in a variety of material properties. They are especially important in determining the behavior of nano-structured materials, such as metallic multilayers. However, interface structure and properties remain poorly understood, in part because the experimental toolbox for characterizing them is limited. Neutron reflectometry (NR) offers unique opportunities for studying interfaces in metals due to the high penetration depth of neutrons and the non-monotonic dependence of their scattering cross-sections on atomic numbers. We review the basic physics of NR and outline the advantages that this method offers for investigating interface behavior in metals, especially under extreme environments. We then present several example NR studies to illustrate these advantages and discuss avenues for expanding the use of NR within the metals community.

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Highlights from the magnetism reflectometer at the SNS

Cited by 94 publications

References 7 publications

Polarization screening-induced magnetic phase gradients at complex oxide interfaces

Polarization screening-induced magnetic phase gradients at complex oxide interfaces

Emerging magnetism and anomalous Hall effect in iridate–manganite heterostructures

Probing Interfaces in Metals Using Neutron Reflectometry

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