Sujoy Roy
Lawrence Berkeley National Laboratory
Magnetic fieldOpticsPhysicsAntiferromagnetismMagnetic domainThin filmScatteringMaterials scienceDiffractionSpin iceCondensed matter physicsSpinsX-rayMagnetizationSpin (physics)Amorphous solidElectrical resistivity and conductivityFerromagnetismSpin-½SkyrmionExchange bias
Publications 115
#3Oswald H. W. Siegmund (UK: University of Kentucky)H-Index: 3
#5Lance E. De Long (UK: University of Kentucky)H-Index: 3
Last. Sujoy Roy (LBNL: Lawrence Berkeley National Laboratory)H-Index: 16
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Detectors with microchannel plates (MCPs) provide unique capabilities to detect single photons with high spatial (<10 µm) and timing (<25 ps) resolution. Although this detection technology was originally developed for applications with low event rates, recent progress in readout electronics has enabled their operation at substantially higher rates by simultaneous detection of multiple particles. In this study, the potential use of MCP detectors with Timepix readout for soft X-ray imaging and spe...
#1Heath R Kersell (LBNL: Lawrence Berkeley National Laboratory)H-Index: 4
#2P. Chen (University of California, Berkeley)H-Index: 1
Last. Slavomír Nemšák (LBNL: Lawrence Berkeley National Laboratory)H-Index: 17
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We have developed an experimental system to simultaneously measure surface structure, morphology, composition, chemical state, and chemical activity for samples in gas phase environments. This is accomplished by simultaneously measuring x-ray photoelectron spectroscopy (XPS) and grazing incidence x-ray scattering in gas pressures as high as the multi-Torr regime while also recording mass spectrometry. Scattering patterns reflect near-surface sample structures from the nano-scale to the meso-scal...
1 CitationsSource
#1Sudip PandeyH-Index: 11
#2Jing-Jin SongH-Index: 4
Last. Sunil K. SinhaH-Index: 26
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#1Justin Woods (UK: University of Kentucky)H-Index: 7
#2X. M. Chen (UK: University of Kentucky)H-Index: 10
Last. J. Todd Hastings (UK: University of Kentucky)H-Index: 8
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Artificial spin ices (ASI) have been widely investigated as magnetic metamaterials with exotic properties governed by their geometries. In parallel, interest in x-ray photon orbital angular momentum (OAM) has been rapidly growing. Here we show that a square ASI with a patterned topological defect, a double edge dislocation, imparts OAM to scattered x rays. Unlike single dislocations, a double dislocation does not introduce magnetic frustration, and the ASI equilibrates to its antiferromagnetic (...
2 CitationsSource
#1Robert Streubel (NU: University of Nebraska–Lincoln)H-Index: 19
#2D. Simca Bouma (University of California, Berkeley)
Last. Frances Hellman (University of California, Berkeley)H-Index: 51
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#1Robert Streubel (NU: University of Nebraska–Lincoln)H-Index: 19
#2D. Simca Bouma (University of California, Berkeley)
Last. Frances Hellman (University of California, Berkeley)H-Index: 51
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Topological solitary fields, such as magnetic and polar skyrmions, are envisioned to revolutionize microelectronics. These configurations have been stabilized in solid-state materials with a global inversion symmetry breaking, which translates in magnetic materials into a vector spin exchange known as the Dzyaloshinskii-Moriya interaction (DMI), as well as spin chirality selection and isotropic solitons. This work reports experimental evidence of 3D chiral spin textures, such as helical spins an...
#1Sophie A. MorleyH-Index: 10
#2Sujoy RoyH-Index: 16
Last. David LedermanH-Index: 29
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