A5047630277- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Magnetic and transport properties of perovskites and related materials
- Magneto-Optical Properties and Applications
- Topological Materials and Phenomena
- Iron oxide chemistry and applications
- Magnetic Properties and Applications
- Quantum and electron transport phenomena
- Thermal properties of materials
- 2D Materials and Applications
- Electrocatalysts for Energy Conversion
- Ferroelectric and Negative Capacitance Devices
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Condensed Matter Physics
- Advanced battery technologies research
- Electronic and Structural Properties of Oxides
- Advanced Thermoelectric Materials and Devices
- Graphene research and applications
- Boron and Carbon Nanomaterials Research
- ZnO doping and properties
- Perovskite Materials and Applications
- Mechanical and Optical Resonators
University of California, Riverside
2020-2025
Massachusetts Institute of Technology
2020
National Synchrotron Radiation Laboratory
2016
University of Science and Technology of China
2016
Realization of efficient spin-orbit torque switching the N\'eel vector in insulating antiferromagnets is a challenge, often complicated by spurious effects. Quantifying torques antiferromagnet or heavy metal heterostructures an important first step toward this goal. Here, we employ magneto-optic techniques to study dampinglike (DL-SOT) $a$-plane $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ (hematite) with Pt overlayer. We find that DL-SOT efficiency 2 orders...
Abstract Precisely engineering the electrical conductivity represents a promising strategy to design efficient catalysts towards oxygen evolution reaction (OER). Here, we demonstrate versatile partial cation exchange method fabricate lamellar Ag‐CoSe 2 nanobelts with controllable conductivity. The of materials was significantly enhanced by addition Ag + cations less than 1.0 %. Moreover, such trace amount induced negligible loss active sites which compensated through effective generation as...
Terahertz (THz) spin dynamics and vanishing stray field make antiferromagnetic (AFM) materials the most promising candidate for next-generation magnetic memory technology with revolutionary storage density writing speed. However, owing to extremely large exchange energy barriers, energy-efficient manipulation has been a fundamental challenge in AFM systems. Here, we report an electrical of orders through record-low current on order 106 A cm-2 facilitated by unique AFM-ferromagnetic (FM)...
Magnon excitations in antiferromagnetic materials and their physical implications have helped to facilitate the emergence of device concepts not presently available ferromagnets. A unique characteristic magnons is coexistence opposite spin polarization, which mimics electron a variety transport phenomena. Among them, most prominent spin-contrasting phenomenon magnon Nernst effect (SNE), refers generation transverse pure current through longitudinal temperature gradient. We introduce selected...
The effect of spin currents on the magnetic order insulating antiferromagnets (AFMs) is fundamental interest and can enable new applications. Toward this goal, characterizing spin-orbit torques (SOTs) associated with AFM-heavy-metal (HM) interfaces important. Here we report full angular dependence harmonic Hall voltages in a predominantly easy-plane AFM, epitaxial c-axis oriented α-Fe_{2}O_{3} films, an interface to Pt. By modeling signals together parameters, determine amplitudes fieldlike...
Noting the structural relationships between phases of carbon and boron carbide with nitride subnitride, we investigate their mutual solubilities using a combination first-principles total energies supplemented statistical mechanics to address finite temperatures. Thus predict solid-state phase diagram boron-carbon-nitrogen (B-C-N). Owing large energy costs substitution, find that ultrahard materials diamond cubic are negligible, same for quasi-two-dimensional graphite hexagonal nitride. In...
Robust spin injection and detection in antiferromagnetic thin films is a prerequisite for the exploration of dynamics development nanoscale antiferromagnet-based spintronic applications. Previous studies have shown antiferromagnet/nonmagnetic metal bilayers; however, these systems has been found effective at cryogenic temperatures only. Here, we experimentally demonstrate sizable interfacial transport hybrid antiferromagnet/ferromagnet system, consisting ${\mathrm{Cr}}_{2}{\mathrm{O}}_{3}$...
Ferrimagnets (FIMs) can function as high-frequency antiferromagnets while being easy to detect ferromagnets, offering unique opportunities for ultrafast device applications. While the physical behavior of FIMs near compensation point has been widely studied, there lacks a generic understanding where ratio sublattice spins vary freely between ferromagnetic and antiferromagnetic limits. Here we investigate properties model two-sublattice FIM manipulated by static magnetic fields...
In an easy-plane antiferromagnet with the Dzyaloshinskii–Moriya interaction (DMI), magnons are subject to effective spin-momentum locking. An in-plane temperature gradient can generate interfacial accumulation of a specified polarization, realizing magnon thermal Edelstein effect. We theoretically investigate injection and detection this thermally driven spin polarization in adjacent heavy metal strong Hall find that inverse voltage depends monotonically on both DMI but non-monotonically...
Harmonic analysis is a powerful tool to characterize and quantify current-induced torques acting on magnetic materials, but so far it remains an open question in studying antiferromagnets. Here we formulate general theory of harmonic Hall responses collinear antiferromagnets driven by including both field-like damping-like components. By scanning field variable strength three orthogonal planes, are able distinguish the contributions from torque, concomitant thermal effects analyzing second...
Realization of efficient spin-orbit torque switching the N\'eel vector in insulating antiferromagnets is a challenge, often complicated by spurious effects. Quantifying torques antiferromagnet/heavy metal heterostructures an important first step towards this goal. Here, we employ magneto-optic techniques to study damping-like (DL-SOT) a-plane $\alpha$-Fe$_2$O$_3$ (hematite) with Pt overlayer. We find that DL-SOT efficiency two orders magnitude larger than reported c- and r-plane hematite/Pt...
Interplay between magnetic ordering and topological electrons not only enables new phases but also underpins electrical control of magnetism. Here we extend the Kane-Mele model to include exchange coupling a collinear background antiferromagnetic (AFM) order, which can describe transition metal trichalcogenides. Owing spin-orbit staggered on-site potential, system could exhibit quantum anomalous Hall spin effects in absence net magnetization. Besides chiral edge states, these support...
Magnon spin Nernst effect was recently proposed as an intrinsic in antiferromagnets, where diffusion and boundary transmission have been ignored. However, processes are essential to convert a bulk current into accumulation, which determines the injection rate detectors through imperfect transmission. We formulate diffusive theory describe detection of magnon with conditions reflecting real device geometry. Thanks effect, output signals both electronic optical grow rapidly increasing system...
The effect of spin currents on the magnetic order insulating antiferromagnets (AFMs) is fundamental interest and can enable new applications. Toward this goal, characterizing spin-orbit torques (SOT) associated with AFM/heavy metal (HM) interfaces important. Here we report full angular dependence harmonic Hall voltages in a predominantly easy-plane AFM, epitaxial c-axis oriented $α$-Fe$_2$O$_3$ films, an interface to Pt. By modeling signals together parameters, determine amplitudes...