A5075320642- Magneto-Optical Properties and Applications
- Magnetic properties of thin films
- Magnetic Properties and Applications
- Iron oxide chemistry and applications
- Theoretical and Computational Physics
- Multiferroics and related materials
- Magnetic Properties of Alloys
- Physics of Superconductivity and Magnetism
- Plant and Fungal Species Descriptions
- Neural Networks and Reservoir Computing
- Electronic and Structural Properties of Oxides
- Crystallization and Solubility Studies
- Molecular Junctions and Nanostructures
- Phytoplasmas and Hemiptera pathogens
- Magnetic Field Sensors Techniques
- Neural Networks and Applications
- Mechanical and Optical Resonators
- Advanced Memory and Neural Computing
- Perovskite Materials and Applications
- Diamond and Carbon-based Materials Research
- Hydrogen Storage and Materials
- Quantum and electron transport phenomena
- Characterization and Applications of Magnetic Nanoparticles
- X-ray Diffraction in Crystallography
- Adhesion, Friction, and Surface Interactions
Massachusetts Institute of Technology
2019-2024
University of Nebraska–Lincoln
2016
Triplet ground-state organic molecules are interesting with respect to several emerging technologies but typically exhibit limited stability. We report two diradicals, one of which possesses a triplet ground state (2J/kB = 234 ± 36 K) and robust stability at elevated temperatures. able sublime this high-spin diradical under high vacuum 140 °C no significant decomposition.
Abstract Magnetic insulators, such as the rare‐earth iron garnets, are promising materials for energy‐efficient spintronic memory and logic devices, their anisotropy, magnetization, other properties can be tuned over a wide range through selection of ion. Films typically grown epitaxial single crystals on garnet substrates, but integration these with conventional electronic devices requires growth Si. The growth, magnetic, spin transport polycrystalline films dysprosium (DyIG) perpendicular...
Abstract Films of polycrystalline terbium iron garnet (TbIG), cerium‐substituted TbIG (CeTbIG), and bismuth‐substituted (BiTbIG) are grown on Si substrates by pulsed laser deposition. The films grow under tensile strain due to thermal mismatch with the substrate, resulting in a dominant magnetoelastic anisotropy which, combined shape anisotropy, leads in‐plane magnetization. has compensation temperature 253 K which is reduced substitution Ce Bi. Faraday rotation at 1550 nm TbIG, 0.36 Bi 0.03...
Polycrystalline single-phase europium iron garnet films (EuIG, Eu3Fe5O12, a ferrimagnetic insulator), with thicknesses from 25 to 50 nm and roughness <1 nm, have been grown on various substrates using pulsed laser deposition followed by rapid thermal anneal. The are under strain that originates primarily mismatch leads magnetoelastic anisotropy dominates the net anisotropy. EuIG quartz (0001) demonstrated perpendicular magnetic (PMA) attributed in-plane (IP) compressive strain,...
Nanometer-thin rare-earth iron garnet films with perpendicular magnetic anisotropy are among the most promising materials for fast and low-energy spintronics applications. Here, authors demonstrate ultrafast control of intrinsically stabilized submicrometer bubble domains in these materials. By employing powerful x-ray imaging techniques both transmission surface sensitivity, by combining this nanosecond electrical pulses femtosecond laser excitation, they deterministically create, image,...
Complex oxide films stabilized by epitaxial growth can exhibit large populations of point defects which have important effects on their properties. The site occupancy pulsed laser-deposited terbium iron garnet (TbIG) with excess (Tb) is analyzed, in the terbium:iron (Tb:Fe)ratio 0.86 compared to stoichiometric value 0.6. magnetic properties TbIG are sensitive occupancy, exhibiting a higher compensation temperature (by 90 K) and lower Curie 40 than bulk Tb3 Fe5 O12 garnet. Data derived from...
We demonstrate a conceptually new mechanism to generate an in-plane spin current with out-of-plane polarization in nonmagnetic metal, detected by nonlocal thermoelectric voltage measurement. (∇T_{OP}) and (∇T_{IP}) temperature gradients, simultaneously, acting on magnetic insulator-Pt bilayer. When the magnetization has component oriented perpendicular plane, ∇T_{OP} drives into Pt due Seebeck effect. ∇T_{IP} then drags resulting spin-polarized electrons parallel plane against gradient...
Nonmagnetic heavy metals can develop a magnetic moment due to the proximity of layer. Here, sign effect in Pt and W grown on ferrimagnetic insulator Dy${}_{3}$Fe${}_{5}$O${}_{12}$ (DyIG) is examined. Polarized neutron reflectometry indicates importance clean metal/garnet interface, shows that Pt/DyIG positive above below DyIG compensation temperature, indicating different origin compared adjacent metal alloy.
The temperature-dependent magnetic moment of a magnetically ordered material is fundamental to all aspects its technological applications. In ferrimagnetic materials with multiple sublattices containing different ions, the magnetization can vary nonmonotonically temperature. Computational modeling these provides insight into their sublattice occupancy and prediction behavior as function composition. Here we develop python computer code called dionne that models magnetism rare earth (RE) iron...
Growth, structural, magnetic, and spin transport properties of epitaxial scandium-substituted terbium iron garnet (TbScIG) thin films on gadolinium gallium [GGG, (111) orientation] substrates are reported as a function Sc content. The GGG without strain relaxation up to thickness 90 nm exhibit perpendicular magnetic anisotropy. Sc, nonmagnetic cation, occupies 40% the octahedral Fe sites. Increasing lowers compensation temperature Curie increases room-temperature saturation magnetization...
We have investigated the unidirectional spin wave heat conveyer effect in sub-micron thick yttrium iron garnet (YIG) films using lock-in thermography (LIT). Although is small thin layers this technique allows us to observe asymmetric transport by magnons which leads temperature profiles differing several mK on both sides of exciting antenna, respectively. Comparison Damon-Eshbach and backward volume modes shows that flow indeed due non-reciprocal spin-waves. Because finite linewidth,...
We compare thermal-gradient-driven transverse voltages in ferrimagnetic-insulator/heavy-metal bilayers (${\mathrm{Tm}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}/\mathrm{W}$ and ${\mathrm{Tm}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}/\mathrm{Pt}$) to corresponding electrically driven resistances at above room temperature. find for ${\mathrm{Tm}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}/\mathrm{W}$ that the thermal electrical effects can be explained by a common spin-current detection mechanism, physics...