A5105406112- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Anodic Oxide Films and Nanostructures
- Rare-earth and actinide compounds
- Machine Learning in Materials Science
- Magnetic and Electromagnetic Effects
- ZnO doping and properties
- Characterization and Applications of Magnetic Nanoparticles
- Image Retrieval and Classification Techniques
- Algorithms and Data Compression
- Hydrogen Storage and Materials
- Quantum and electron transport phenomena
- Computational Physics and Python Applications
- Shape Memory Alloy Transformations
- Electron and X-Ray Spectroscopy Techniques
- Transition Metal Oxide Nanomaterials
- CCD and CMOS Imaging Sensors
- MXene and MAX Phase Materials
- Ferroelectric and Piezoelectric Materials
- Topological Materials and Phenomena
- High-pressure geophysics and materials
University of Maryland, College Park
2012-2022
Lawrence Berkeley National Laboratory
2017-2021
Joint Center for Artificial Photosynthesis
2017-2021
Ames National Laboratory
2013
SLAC National Accelerator Laboratory
2013
Stanford Synchrotron Radiation Lightsource
2013
Iowa State University
2013
University of Michigan
2013
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Jun Cui, Yiming Wu, Jan Muehlbauer, Yunho Hwang, Reinhard Radermacher, Sean Fackler, Manfred Wuttig, Ichiro Takeuchi; Demonstration of high efficiency elastocaloric cooling with large ΔT using NiTi wires. Appl. Phys. Lett. 13 August 2012; 101 (7): 073904. https://doi.org/10.1063/1.4746257 Download citation...
Xi-cam is an extensible platform for data management, analysis and visualization. aims to provide a flexible approach synchrotron treatment as solution rising demands high-volume/high-throughput processing pipelines. The core of plugin-based graphical user interface which provides users with interactive algorithms. Plugins are available SAXS/WAXS/GISAXS/GIWAXS, tomography NEXAFS data. With Xi-cam's `advanced' mode, steps designed graph-based workflow, can be executed live, locally or...
We have investigated the magnetic and structural properties of Fe-Co-W films using a composition spread technique. From magnetometry measurements, large magnetization (900 emu/cm3) enhanced perpendicular coercive fields (2–3 kOe) low W concentration were observed. The synchrotron diffraction results show transition from crystalline to an amorphous state crystallization onset increases with increasing concentration. SEM TEM characterizations that concentrations vertically standing...
The proximity effect at the interface between a topological insulator (TI) and superconductor is predicted to give rise chiral superconductivity Majorana fermion excitations. In most TIs studied date, however, conducting bulk states have overwhelmed transport properties precluded investigation of interplay surface state Cooper pairs. Here, we demonstrate superconducting in SmB6 thin films which display insulation low temperatures. Fermi velocity deduced from found be as large 10^5 m/s, good...
We investigated the local coupling between dense magnetic stripe domains in transcritical permalloy (tPy) thin films and ferroelectric of BaTiO3 single crystals a tPy/BaTiO3 heterostructure. Two distinct changes tPy were observed from force microscopy images after cooling heterostructure above Curie temperature (120 °C) to room temperature. First, an abrupt break domain direction was found at a-c-domain boundaries due induced change in-plane anisotropy. Second, period increased when coupled...
We demonstrate substantial enhancement in the energy product of MnBi-based magnets by forming robust ferromagnetic exchange coupling between a MnBi layer and thin CoFe unique perpendicular configuration, which provides increased resistance to magnetization reversal. The measured nominal $172\phantom{\rule{0.16em}{0ex}}\mathrm{kJ}/{\mathrm{m}}^{3}$ at room temperature is largest value experimentally attained for permanent free expensive raw materials. Our finding shows that exchange-coupled...
Thin film libraries of Fe-Co-V were fabricated by combinatorial sputtering to study magnetic and structural properties over wide ranges composition thickness high-throughput methods: synchrotron X-ray diffraction, magnetometry, composition, measured across the libraries. In-plane hysteresis loops shown have a coercive field 23.9 kA m-1 (300 G) magnetization 1000 m-1. The out-of-plane direction revealed enhanced fields 207 (2.6 kG) which was attributed shape anisotropy column grains observed...
By measuring the spin polarization of secondary electrons and intensity backscattered generated in a scanning electron microscope, we are able to simultaneously image ferromagnetic domain structure thin film ferroelectric underlying substrate upon which it is grown. Simultaneous imaging allows straightforward, quantitative measurements correlations these complex multiferroic systems. We have successfully imaged domains CoFe/BFO Fe/BTO, two systems with very different...
We have fabricated Fe-B thin film composition spreads in search of possible superconducting phases following a theoretical prediction by Kolmogorov et al.^1 Co-sputtering was used to deposit covering large compositional region the binary phase diagram. A trace found nanocrystalline part spread, where undergoes metal insulator transition as function with average FeB_2. The resistance drop occurs at 4K, and diamagnetic signal has also been detected same temperature. superconductivity is...
Oxynitrides with the photoelectrochemical stability of oxides and desirable band energetics nitrides comprise a promising class materials for solar photochemistry. Challenges in synthesizing wide variety oxynitride has limited exploration this functional materials, which we address using reactive cosputtering combined rapid thermal processing method to synthesize multi-cation–multi-anion libraries. We demonstrate synthesis LaxTa1–xOyNz thin film composition spread library its...
Free-standing CoFe thin-film doubly clamped stress reconfigurable resonators were investigated as a function of magnetic field and pressure. A large uniaxial anisotropy resulting from residual tensile stress, revealed hysteresis loops, leads to an easy magnetization axis aligned along the length beams. The quality factor driven resonator beams under vacuum is increased by 30 times, leading enhanced signal-to-noise ratio predicted reduction in intrinsic noise 6, potentially reaching low ∼25...
Based on hydrogen-mediated ferromagnetism and a selective hydrogen exposure technique, i.e., lithography, we attempted to produce magnetic domains in paramagnetic host. Hydrogen lithography Co-doped ZnO with an anodic aluminum oxide template was used nanomagnetic ZnO. The showed in-plane magnetization head-to-tail configuration at room temperature, which is consistent the object-oriented micro-magnetic framework simulations.
In the search for photoanode materials with band gaps suitable utilization in solar fuel generation, approximately 1.2–2.8 eV, theory-guided experiments have identified a variety of that meet gap requirements and exhibit operational stability harsh photoelectrochemical environments. particular, M-V-O compounds (M is transition metal or main group element) VO4 structural motifs were predicted to show remarkably wide range energetics (>3 eV variation energy valence maximum) characteristics,...
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The electrochemical reduction of carbon dioxide to fuels and chemicals using electricity produced from renewable sources represents an appealing approach creating a neutral fuel cycle or negative chemical production pathway. However, lack fundamental understanding the surface catalyst during experiments hinders development more active catalysts. Recent reports indicate that can change drastically under reducing conditions, suggesting form may differ as characterized ex situ . Consequently,...
The spin structure of exchange-coupled MnBi:Co-Fe bilayers is investigated by X-ray magnetic circular dichroism (XMCD), polarized neutron reflectometry (PNR), and micromagnetic simu-lations. purpose the present research two-fold. First, current search for new permanent-magnet materials includes hard-soft nanocomposites, analysis coercivity mechanisms in these structures an important aspect this quest. Second, topological micro-magnetic such as skyrmions have recently become intense...