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Transferring Orbital Angular Momentum to an Electron Beam Reveals Toroidal and Chiral Order
Kayla X. Nguyen, Yi Jiang, Michael C. Cao +13
Orbital angular momentum and torque transfer play central roles in a wide range of magnetic textures and devices including skyrmions and spin-torque electronics(1-4). Analogous top…
Revealing the Nanostructure of Mesoporous Fuel Cell Catalyst Supports for Durable, High-Power Performance
Matthew Ko, Elliot Padgett, Venkata Yarlagadda +2
Achieving high power performance and durability with low Pt loadings are critical challenges for proton exchange membrane fuel cells. PtCo catalysts developed on new carbon black s…
-phase Inclusions as Common Defects in Alloyed -(AlGa)O and Doped -GaO Films
Celesta S. Chang, Nicholas Tanen, Vladimir Protasenko +5
-GaO is a promising ultra-wide bandgap semiconductor whose properties can be further enhanced by alloying with Al. Here, using atomic-resolution scanning transmission el…
Adsorption-Controlled Growth of Ga2O3 by Suboxide Molecular-Beam Epitaxy
Patrick Vogt, Felix V. E. Hensling, Kathy Azizie +15
This paper introduces a growth method---suboxide molecular-beam epitaxy (S-MBE)---which enables the growth of Ga2O3 and related materials at growth rates exceeding 1 micrometer per…
Tuning the convergence angle for optimum STEM performance
Matthew Weyland, David A. Muller
The achievable instrumental performance of a scanning transmission electron microscope (STEM) is determined by the size and shape of the incident electron probe. The most important…
Observation of strong bulk damping-like spin-orbit torque in chemically disordered ferromagnetic single layers
Lijun Zhu, Xiyue S. Zhang, David A. Muller +2
Strong damping-like spin-orbit torque (τDL) has great potential for enabling ultrafast energy-efficient magnetic memories, oscillators, and logic. So far, the reported τDL exerted…
Imaging Polarity in Two Dimensional Materials by Breaking Friedel's Law
Pratiti Deb, Michael C. Cao, Yimo Han +5
Friedel's law guarantees an inversion-symmetric diffraction pattern for thin, light materials where a kinematic approximation or a single-scattering model holds. Typically, breakin…
In situ modification of delafossite type PdCoO2 bulk single crystal for reversible hydrogen sorption and fast hydrogen evolution
Guowei Li, Seunghyun Khim, Celesta S. Chang +11
The observation of extraordinarily high conductivity in delafossite-type PdCoO2 is of great current interest, and there is some evidence that electrons behave like a fluid when flo…
Structural Heterogeneity, Ductility, and Glass Forming Ability of Zr-Based Metallic Glasses
Soohyun Im, Pengyang Zhao, Geun Hee Yoo +9
We show the correlation between nanoscale structural heterogeneity and mechanical property and glass forming ability of Zr-based metallic glasses (MGs). Detailed parameters of medi…
Controlled introduction of defects to delafossite metals by electron irradiation
V. Sunko, P. H. McGuinness, C. S. Chang +7
The delafossite metals PdCoO, PtCoO and PdCrO are among the highest conductivity materials known, with low temperature mean free paths of tens of microns in the b…
Disentangling magnetic and grain contrast in polycrystalline FeGe thin films using four-dimensional Lorentz scanning transmission electron microscopy
Kayla X. Nguyen, Xiyue S. Zhang, Emrah Turgut +9
The study of nanoscale chiral magnetic order in polycrystalline materials with a strong Dzyaloshinkii-Moriya interaction (DMI) is interesting for the observation of magnetic phenom…