137 citations · 1.6k across the 47 of their papers we have counts for
27 papers · 1 filter
Role of Magnetic Defects and Defect-engineering of Magnetic Topological Insulators
Farhan Islam, Yongbin Lee, Daniel M. Pajerowski +5
Magnetic defects play an important, but poorly understood, role in magnetic topological insulators (TIs). For example, topological surface transport and bulk magnetic properties ar…
Polaronic Conductivity in CrGeTe Single Crystals
Yu Liu, Myung-Geun Han, Yongbin Lee +11
Intrinsic, two-dimensional (2D) ferromagnetic semiconductors are an important class of materials for spin-charge conversion applications. CrGeTe retains long-range magn…
Interplay between magnetism and band topology in Kagome magnets MnSn
Y. Lee, R. Skomski, X. Wang +9
Kagome-lattice magnets MnSn recently emerged as a new platform to exploit the interplay between magnetism and topological electronic states. Some of the most exciting fe…
The role of surface spin polarization on ceria-supported Pt nanoparticles
Byungkyun Kang, Joshua L. Vincent, Peter A. Crozier +1
In this work, we employ first-principles simulations to investigate the spin polarization of CeO-(111) surface and its impact on interactions between a ceria support and Pt nan…
Magnetic interactions and spin excitations in van der Waals ferromagnet VI
Elijah Gordon, V. V. Mkhitaryan, Haijun Zhao +2
Using a combination of density functional theory (DFT) and spin-wave theory methods, we investigate the magnetic interactions and spin excitations in semiconducting VI. Exchang…
Self-consistently renormailzed spin-wave theory of layered ferromagnets on honeycomb lattice
Vagharsh Mkhitaryan, Liqin Ke
We develop a self-consistently renormalized spin-wave theory, within a mean-field approximation, for the two-dimensional Heisenberg ferromagnet with perpendicular easy-axis anisotr…
Defect-driven ferrimagnetism and hidden magnetization in MnBiTe
You Lai, Liqin Ke, Jiaqiang Yan +2
MnBiTe (MBT) materials are promising antiferromagnetic topological insulators where field driven ferromagnetism is predicted to cause a transition between axion insulator a…
X-ray spectra in magnetic van der Waals materials FeGeTe, CrI, and CrGeTe: a first-principles study
Y. Lee, V. N. Antonov, B. N. Harmon +1
Using density functional theory (DFT) methods, we have calculated X-ray absorption spectroscopy (XAS) and X-ray circular dichroism (XMCD) spectra in bulk and thin films of FeGe…
Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials
Liqin Ke, Mikhail I. Katsnelson
Despite serious effort, the nature of the magnetic interactions and the role of electron-correlation effects in magnetic two-dimensional (2D) van der Waals materials remain elusive…
Deterministic strain-control of stability and current-induced motion of skyrmions in chiral magnets
Phuong-Vu Ong, Tae-Hoon Kim, Haijun Zhao +3
External magnetic field, temperature, and spin-polarized current are usually employed to create and control nanoscale vortex-like spin configurations such as magnetic skyrmions. Al…
Mechanisms of skyrmion and skyrmion crystal formation from the conical phase
Taehoon Kim, Haijun Zhao, Ben Xu +6
Real-space topological magnetic structures such as skyrmions and merons are promising candidates for information storage and transport. However, the microscopic mechanisms that con…
Intersublattice magnetocrystalline anisotropy using a realistic tight-binding method based on maximally localized Wannier functions
Liqin Ke
Using a realistic tight-binding Hamiltonian based on maximally localized Wannier functions, we investigate the two-ion magnetocrystalline anisotropy energy (MAE) in transiti…
On spinodal decomposition in alnico---a transmission electron microscopy and atom probe tomography study
Lin Zhou, Wei Guo, Jonathan D. Poplawsky +4
Alnico is a prime example of a finely tuned nanostructure whose magnetic properties are intimately connected to magnetic annealing (MA) during spinodal transformation and subsequen…
Simulation of alnico coercivity
Liqin Ke, Ralph Skomski, Todd D. Hoffmann +6
Micromagnetic simulations of alnico show substantial deviations from Stoner-Wohlfarth behavior due to the unique size and spatial distribution of the rod-like Fe-Co phase formed du…
Microstructural and magnetic property evolution with different heat-treatment conditions in an alnico alloy
Lin Zhou, Wei Tang, Liqin Ke +3
Further property enhancement of alnico, an attractive near-term, non-rare-earth permanent magnet alloy system, primarily composed of Al, Ni, Co, and Fe, relies on improved morpholo…
Electronic structure and magnetic properties in ( = Fe, Mn, Cr, Co, and Ni) and their alloys
Liqin Ke, Bruce N. Harmon, Matthew J. Kramer
The electronic structure and intrinsic magnetic properties of -related compounds and their alloys have been investigated using density functional theory. F…
Intrinsic magnetic properties of {(FeCo)Ti} ( = Y and Ce; = H, C, and N)
Liqin Ke, Duane D. Johnson
To guide improved properties coincident with reduction of critical materials in permanent magnets, we investigate via density functional theory (DFT) the intrinsic magnetic propert…
Origin of magnetic anisotropy in doped CeCo alloys
Liqin Ke, D. A. Kukusta, Duane D. Johnson
Magnetocrystalline anisotropy (MCA) in doped CeCo and other competing structures was investigated using density functional theory. We confirmed that the MCA contributi…
Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations
Xin Zhao, Liqin Ke, Manh Cuong Nguyen +2
The structures and magnetic properties of the Co-Zr-B alloys near the Co5Zr composition were studied using adaptive genetic algorithm and first-principles calculations to guide fur…
Alternating magnetic anisotropy of Li(Li)N with = Mn, Fe, Co, and Ni
A. Jesche, L. Ke, J. L. Jacobs +3
Substantial amounts of the transition metals Mn, Fe, Co, and Ni can be substituted for Li in single crystalline Li(Li)N. Isothermal and temperature-dependent magneti…
Band-filling effect on magnetic anisotropy using a Green's function method
Liqin Ke, Mark van Schilfgaarde
We use an analytical model to describe the magnetocrystalline anisotropy energy (MAE) in solids as a function of band filling. The MAE is evaluated in second-order perturbation the…
Origin of the spin reorientation transitions in (FeCo)B alloys
Kirill D. Belashchenko, Liqin Ke, Markus Däne +7
Low-temperature measurements of the magnetocrystalline anisotropy energy in (FeCo)B alloys are reported, and the origin of this anisotropy is elucidated usi…
Constituents of magnetic anisotropy and a screening of spin-orbit coupling in solids
Vladimir Antropov, Liqin Ke, Daniel Åberg
Using quantum mechanical perturbation theory (PT) we analyze how the energy of perturbation of different orders is renormalized in solids. We test the validity of PT analysis by co…
Effects of alloying and strain on the magnetic properties of FeN
Liqin Ke, Kirill D. Belashchenko, Mark van Schilfgaarde +2
The electronic structure and magnetic properties of pure and doped {FeN} systems have been studied in the local-density (LDA) and quasiparticle self-consistent {\emph{GW…