A5030606823- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Advancements in Battery Materials
- Advanced Memory and Neural Computing
- Quantum Computing Algorithms and Architecture
- Multiferroics and related materials
- Ferroelectric and Negative Capacitance Devices
- Ferroelectric and Piezoelectric Materials
- Semiconductor materials and interfaces
- Advanced Battery Materials and Technologies
- Magnetic Field Sensors Techniques
- Characterization and Applications of Magnetic Nanoparticles
- Surface and Thin Film Phenomena
- Electronic and Structural Properties of Oxides
- Chemical Synthesis and Characterization
- Quantum many-body systems
- Advanced Battery Technologies Research
- Microwave Dielectric Ceramics Synthesis
- Extraction and Separation Processes
- Neural Networks and Reservoir Computing
- Electrostatics and Colloid Interactions
- Electron and X-Ray Spectroscopy Techniques
Argonne National Laboratory
2021-2025
ETH Zurich
2018-2024
Northwestern University
2021-2022
University of California, San Diego
2021
Paul Scherrer Institute
2018-2021
Phoenix Scientific Industries (United Kingdom)
2020
Texas State University
2015
Sam Houston State University
2012-2013
Antiferromagnetic (AFM) materials are a pathway to spintronic memory and computing devices with unprecedented speed, energy efficiency, bit density. Realizing this potential requires AFM simultaneous electrical writing reading of information, which also compatible established silicon-based manufacturing. Recent experiments have shown tunneling magnetoresistance (TMR) readout in epitaxial tunnel junctions. However, these TMR structures not grown using silicon-compatible deposition process,...
Nanomagnets are a promising low-power alternative to traditional computing. However, the successful implementation of nanomagnets in logic gates has been hindered so far by lack reliability. Here, we present novel design with dipolar-coupled arranged on square lattice (i) support transfer information and (ii) perform operations. We introduce thermal protocol, using thermally active as means computation. Within this scheme, initialized global magnetic field relax raising temperature resistive...
Nanomagnetic logic is promising for low-power computing, and integration of data processing memory in the same architecture. In this work thermal relaxation paths associated with operations artificial spin ice are considered, which involve switching individual nanomagnets toward a low-energy state. Both monotonic intermittent have been identified, lend themselves to deterministic probabilistic computing respectively. Furthermore, balance competing can be shifted, essential implementing...
A possible spintronic route to hardware implementation for decision-making involves injecting a domain wall into bifurcated magnetic nanostrip resembling Y-shaped junction. decision is made when the chooses particular path through bifurcation. Recently, it was shown that structure like nanomagnetic Galton board, which essentially an array of interconnected junctions, produces outcomes are stochastic and therefore relevant artificial neural networks. However, exact mechanism leading robust...
Artificial kagome spin ice exhibits exotic magnetic correlations driven by a combination of geometric frustration and dipolar interactions that, at low-enough temperature, can result in ordered phases. This order, whether it is the ground state several rings, or theoretically predicted long-range order an extended array, has yet to be experimentally observed. By introducing interfacial Dzyaloshinskii-Moriya interaction, we are able reduce blocking temperature individual nanomagnets, allowing...
Ti substituted LiFePO4 with nominal composition Li1-4yTiyFePO4 (y = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) cathode materials were prepared by solid-state reaction. The as-prepared samples characterized X-ray diffraction, absorption spectroscopy, cyclic charge-discharge, voltammograms, electrochemical impendence spectroscopy. diffraction results indicate that the increase of Ti4+ amount leads to expansion lattice monotonically, but XAS reveals small doped can also form TiO2-anatase impurities....
The control of emergent magnetic monopoles for the generation monopole currents in artificial spin ice is essential their use nanomagnet-based device applications. Here we present a scheme to inject into an square at specific locations, which provides means propagation generated currents. Specifically, modify by populating two its edges with different vertex configurations consisting two, three, and four nanomagnets meeting common point. After setting initial state global field, injection...
Spin torque is a promising tool for driving magnetization dynamics computing technologies. These torques can be easily produced by spin-orbit effects, but most conventional spin source materials, high degree of crystal symmetry limits the geometry produced. Magnetic ordering one way to reduce material and allow exotic torques, antiferromagnets are particularly because they robust against external fields. We present ferromagnetic resonance (ST-FMR) measurements second harmonic Hall...
<title>Abstract</title> Conventional approaches to computing with nanomagnets require an initial state, and a final state corresponding expected outcome. Assuming single spin-flip regime, energetic relaxation from the initialized that of low energy will include intermediate states variable magnetostatic energies, which affect probability Here, we investigate in simple nanomagnet toy model consisting four arranged onto square plaquette. In doing so, are able systematically demonstrate design...
A possible spintronic route to hardware implementation for decision making involves injecting a domain wall into bifurcated magnetic nanostrip resembling Y-shaped junction. is made when the chooses particular path through bifurcation. Recently, it was shown that structure like nanomagnetic Galton Board, which essentially an array of interconnected junctions, produces outcomes are stochastic and therefore relevant artificial neural networks. However, exact mechanism leading robust nature...
The authors systematically reveal that magnetic textures can be controlled via topology, using discrete objects. A formulation of the topological winding number is used to define stray field from individual nanomagnets, which in turns controls texture a disk. demonstrate experimentally appropriate conditions stabilize an energetically unfavorable structure, such as antivortex permalloy argument holds even coupled systems, leading, for example, applications neuromorphic computing.
Investigation of the spin Hall effect in gold has triggered increasing interest over past decade, since combines properties a large bulk diffusion length and strong interfacial spin-orbit coupling. However, discrepancies between values angle reported literature have brought into question microscopic origin Au. Here, we investigate thickness dependence spin-charge conversion efficiency single Au films ultrathin Au/Si multilayers by non-local transport spin-torque ferromagnetic resonance...
The effect of confinement on electron and ion transport in oxide films is interest both fundamentally technologically for the design next-generation electronic devices. In metal oxides with mobile ions vacancies, it interplay different modes charge corresponding current–voltage signatures that interest. We developed a patterned structure titania films, feature sizes 11–20 nm, allow us to explore confined transport. describe how changes competing mechanisms, antidot array leads displacement...
Due to its high thermal stability, low cost and theoretical charge capacity, LiFePO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> has emerged as one of the most promising cathode materials for large-scale lithium ion batteries. In this work, we systematically investigated effect on structure electrochemical properties brought by W doping Fe site . LiFe xmlns:xlink="http://www.w3.org/1999/xlink">1-y</sub>...
We use co-sputtering to directly synthesize thin films of the A15 phase intermetallic compound Ta3Sb, which has been predicted have a giant spin Hall conductivity. identify large window Ta:Sb flux ratio that stabilizes single-phase Ta3Sb. Composition analyses these show atomic 4:1, is consistent with known Ta-Sb diagram. The conductivity film Ta3Sb -3400+/-400 (hbar/2e) S/cm and spin-orbit torque efficiency -0.6+/-0.1 at 20 K, as determined from harmonic measurements Ta3Sb/permalloy bilayer...