S. J. Poon
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View article: Machine Learning Phase Classification of Thermoelectric Materials
Machine Learning Phase Classification of Thermoelectric Materials Open
In this study, we employ a Support Vector Machine (SVM) model to efficiently classify the phases of thermoelectric (TE) alloys. While ab initio calculations and experiments have explored the phases of functional TE materials, the large var…
View article: Comparing Machine Learning Models for Strength and Ductility in High-Entropy Alloys
Comparing Machine Learning Models for Strength and Ductility in High-Entropy Alloys Open
We compare several machine learning (ML) models that predict the yield strength and plasticity of high-entropy alloys (HEAs) for achieving high-accuracy with notably low root mean square errors (RMSE). Our models, developed using a compreh…
View article: Predicting Yield Strength and Plastic Elongation in Body-Centered Cubic High-Entropy Alloys
Predicting Yield Strength and Plastic Elongation in Body-Centered Cubic High-Entropy Alloys Open
We employ machine learning (ML) to predict the yield stress and plastic strain of body-centered cubic (BCC) high-entropy alloys (HEAs) in the compression test. Our machine learning model leverages currently available databases of BCC and B…
View article: Phase Change-Induced Magnetic Switching through Metal–Insulator Transition in VO2/TbFeCo Films
Phase Change-Induced Magnetic Switching through Metal–Insulator Transition in VO2/TbFeCo Films Open
The ability to manipulate spins in magnetic materials is essential in designing spintronics devices. One method for magnetic switching is through strain. In VO2 on TiO2 thin films, while VO2 remains rutile across the metal–insulator transi…
View article: Phase Change Induced Magnetic Switching through Metal-insulator Transition in VO2/TbFeCo Films
Phase Change Induced Magnetic Switching through Metal-insulator Transition in VO2/TbFeCo Films Open
The ability to manipulate spins in magnetic materials is essential in designing spintronics devices. One method for magnetic switching is through strain. In VO2 on TiO2 thin films, while VO2 remains rutile across the metal-insulator transi…
View article: Measurement of the Dzyaloshinskii–Moriya Interaction in Mn4N Films That Host Skyrmions
Measurement of the Dzyaloshinskii–Moriya Interaction in Mn4N Films That Host Skyrmions Open
Mn4N thin film is one of the potential magnetic mediums for spintronic devices due to its ferrimagnetism with low magnetization, large perpendicular magnetic anisotropy (PMA), thermal stability, and large domain wall velocity. Recent exper…
View article: Measurement of the Dzyaloshinskii-Moriya Interaction in Mn4N Films that Host Skyrmions
Measurement of the Dzyaloshinskii-Moriya Interaction in Mn4N Films that Host Skyrmions Open
Mn4N thin film is one of the potential magnetic mediums for spintronic devices due to its ferrimagnetism with low magnetization, large perpendicular magnetic anisotropy (PMA), thermal stability, and large domain wall velocity. A recent exp…
View article: Conventional Half-Heusler alloys advance state-of-the-art thermoelectric properties
Conventional Half-Heusler alloys advance state-of-the-art thermoelectric properties Open
Half-Heusler phases have garnered much attention as thermally stable and non-toxic thermoelectric materials for power conversion in the mid-to-high temperature domain. The most studied half-Heusler alloys to date utilize the refractory met…
View article: Interfacial mixing effect in a promising skyrmionic material: Ferrimagnetic Mn4N
Interfacial mixing effect in a promising skyrmionic material: Ferrimagnetic Mn4N Open
Interfacial mixing of elements is a well-known phenomenon found in thin film deposition. For thin-film magnetic heterostructures, interfacial compositional inhomogeneities can have drastic effects on the resulting functionalities. As such,…
View article: Skyrmionics—Computing and memory technologies based on topological excitations in magnets
Skyrmionics—Computing and memory technologies based on topological excitations in magnets Open
Solitonic magnetic excitations such as domain walls and, specifically, skyrmionics enable the possibility of compact, high density, ultrafast, all-electronic, low-energy devices, which is the basis for the emerging area of skyrmionics. The…
View article: Effect of Mn Content on the Passivation and Corrosion of Al0.3Cr0.5Fe2MnxMo0.15Ni1.5Ti0.3 Compositionally Complex Face-Centered Cubic Alloys
Effect of Mn Content on the Passivation and Corrosion of Al0.3Cr0.5Fe2MnxMo0.15Ni1.5Ti0.3 Compositionally Complex Face-Centered Cubic Alloys Open
Al0.3Cr0.5Fe2MnxMo0.15Ni1.5Ti0.3 (x = 0, 0.25, 0.5, 1) compositionally complex alloys are synthesized and annealed at 1,070°C to form two-phase alloys with a face-centered cubic (fcc) matrix and a second phases enriched in Al, Ti, and Ni w…
View article: Rare-earth-free ferrimagnetic Mn4N sub-20 nm thin films as potential high-temperature spintronic material
Rare-earth-free ferrimagnetic Mn4N sub-20 nm thin films as potential high-temperature spintronic material Open
Ferrimagnetic alloy thin films that exhibit perpendicular (out-of-plane) magnetic anisotropy (PMA) with low saturation magnetization, such as GdCo and Mn4N, were predicted to be favorable for hosting small Néel skyrmions for room temperatu…
View article: Rare-earth-free ferrimagnetic Mn4N sub-20 nm thin films as high-temperature spintronic material
Rare-earth-free ferrimagnetic Mn4N sub-20 nm thin films as high-temperature spintronic material Open
Ferrimagnetic alloy thin films that exhibit perpendicular (out-of-plane) magnetic anisotropy (PMA) with low saturation magnetization, such as GdCo and Mn4N, were predicted to be favorable for hosting small Neel skyrmions for room temperatu…
View article: Navigating the Complex Compositional Landscape of High-Entropy Alloys
Navigating the Complex Compositional Landscape of High-Entropy Alloys Open
High-entropy alloys, which exist in the high-dimensional composition space, provide enormous unique opportunities for realizing unprecedented structural and functional properties. A fundamental challenge, however, lies in how to predict th…
View article: Publisher Correction: High Entropy Alloys Mined From Binary Phase Diagrams
Publisher Correction: High Entropy Alloys Mined From Binary Phase Diagrams Open
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
View article: Enhanced Figure of Merit in Bismuth-Antimony Fine-Grained Alloys at Cryogenic Temperatures
Enhanced Figure of Merit in Bismuth-Antimony Fine-Grained Alloys at Cryogenic Temperatures Open
Thermoelectric (TE) materials research plays a vital role in heat-to-electrical energy conversion and refrigeration applications. Bismuth-antimony (Bi-Sb) alloy is a promising material for thermoelectric cooling. Herein, a high figure of m…
View article: Amorphous Ferrimagnets: an Ideal Host for Ultra-Small Skyrmions at Room Temperature
Amorphous Ferrimagnets: an Ideal Host for Ultra-Small Skyrmions at Room Temperature Open
Recently, magnetic skyrmion has emerged as an active topic of fundamental study and applications in magnetic materials research. Magnetic skyrmions are vortex-like spin excitations with topological protection and therefore are more robust …
View article: Robust Formation of Ultrasmall Room-Temperature Neél Skyrmions in Amorphous Ferrimagnets from Atomistic Simulations
Robust Formation of Ultrasmall Room-Temperature Neél Skyrmions in Amorphous Ferrimagnets from Atomistic Simulations Open
Neél skyrmions originate from interfacial Dzyaloshinskii Moriya interaction (DMI). Recent studies have explored using thin-film ferromagnets and ferrimagnets to host Neél skyrmions for spintronic applications. However, it is unclear if ult…
View article: Robust Formation of Ultrasmall Room-Temperature Neél Skyrmions in Amorphous Ferrimagnets from Atomistic Simulations
Robust Formation of Ultrasmall Room-Temperature Neél Skyrmions in Amorphous Ferrimagnets from Atomistic Simulations Open
Neél skyrmions originate from interfacial Dzyaloshinskii Moriya interaction (DMI). Recent studies have explored using thin-film ferromagnets and ferrimagnets to host Neél skyrmions for spintronic applications. However, it is unclear if ult…
View article: Critical evaluation of p-type doping effects in Bi-Sb alloys
Critical evaluation of p-type doping effects in Bi-Sb alloys Open
We have investigated the doping effects of elements (Sn, Pb, Ge) with valence 4 in Bi-Sb alloys. The solubilities of these elements in Bi-Sb alloy are known to range from ∼3 to ∼0.5 to zero atomic percent, respectively. We employed a rapid…
View article: High Entropy Alloys Mined From Phase Diagrams
High Entropy Alloys Mined From Phase Diagrams Open
High entropy alloys (HEA) show promise as a new type of high-performance structural material. Their vast degrees of freedom provide for extensive opportunities to design alloys with tailored properties. However, the compositional complexit…
View article: Thickness dependence of ferrimagnetic compensation in amorphous rare-earth transition-metal thin films
Thickness dependence of ferrimagnetic compensation in amorphous rare-earth transition-metal thin films Open
Magnetic compensation in ferrimagnets plays an important role in spintronic and magnetic recording devices. Experimental results have demonstrated a thickness dependence of the compensation temperature (Tcomp) in amorphous TbFeCo thin film…
View article: Skyrmion Formation Induced by Antiferromagnetic-enhanced Interfacial Dzyaloshinskii Moriya Interaction
Skyrmion Formation Induced by Antiferromagnetic-enhanced Interfacial Dzyaloshinskii Moriya Interaction Open
Neél skyrmions originate from interfacial Dzyaloshinskii Moriya interaction (DMI). Recent studies have explored using ferromagnet to host Neél skyrmions for device applications. However, challenges remain to reduce the size of skyrmion to …