Fully spin-polarized Weyl fermions and in/out-of-plane quantum anomalous Hall effects in a two-dimensional d0 ferromagnet

Nanoscale ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 5901-5909
Author(s):  
Lei Jin ◽  
Lirong Wang ◽  
Xiaoming Zhang ◽  
Ying Liu ◽  
Xuefang Dai ◽  
...  
Keyword(s):  
Topological Phases ◽  
Two Dimensional ◽  
Magnetization Direction ◽  
Hall Effects ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Weyl Fermions

A YN2 monolayer can realize multiple topological phases, determined based on the magnetization direction. In particular, the in-plane QAHE can be realized in a d0 ferromagnet.

Magnetic quantum oscillations in doped antiferromagnets

2017 ◽  
Vol 31 (25) ◽  
pp. 1745015
Author(s):  
V. V. Kabanov
Keyword(s):  
Magnetic Field ◽  
Polar Angle ◽  
Two Dimensional ◽  
Plane Angle ◽  
Arbitrary Direction ◽  
Magnetization Direction ◽  
Quantum Oscillations ◽  
Out Of Plane ◽  
Plane Direction ◽  
Magnetic Quantum Oscillations

Energy spectrum of electrons (holes) doped into two-dimensional (2D) antiferromagnetic (AF) semiconductors is quantized in an external magnetic field of arbitrary direction. A peculiar dependence of de Haas–van Alphen (dHvA) magneto-oscillation amplitudes on the azimuthal in-plane angle from the magnetization direction and on the polar angle from the out-of-plane direction is found. The angular dependence of the amplitude is different if the measurements are performed in the field above and below of the spin-flop field.

scholarly journals Highly spin-polarized electronic structure and magnetic properties of Mn2.25Co0.75Al1−xGex Heusler alloys: first-principles calculations

RSC Advances ◽  
2020 ◽  
Vol 10 (38) ◽  
pp. 22556-22569
Author(s):  
Yue Wang ◽  
Liying Wang ◽  
Wenbo Mi
Keyword(s):  
First Principles ◽  
Heusler Alloys ◽  
Lattice Deformation ◽  
First Principles Calculations ◽  
Easy Magnetization ◽  
Magnetization Direction ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Plane Direction ◽  
Easy Magnetization Direction

The complete spin polarizations of Mn2.25Co0.75Al1−xGex are proved to be robust against stoichiometric defect and lattice deformation, whose easy magnetization direction can be manipulated from in-plane direction to out-of-plane one under uniaxial strain.

Temperature Dependence of Two-Dimensional Spin Anisotropies

1989 ◽  
Vol 151 ◽  
Author(s):  
Roy Richter ◽  
Jack G. Gay
Keyword(s):  
Electronic Structure ◽  
Permanent Magnets ◽  
Computer Time ◽  
Essential Property ◽  
Two Dimensional ◽  
High Quality ◽  
Easy Direction ◽  
Spin Polarized ◽  
Out Of Plane ◽  
Large Anisotropy

ABSTRACTLarge anisotropy energy is an essential property of high quality permanent magnets. In previous work we have calculated the spin polarized electronic structure and anisotropy of monolayers and slabs of Fe, Ni, and V. In this work we calculate the dependence on temperature of the spin anisotropy of a ferromagnetic monolayer of Fe. We find the easy direction of magnetization is not sensitive to the temperature; the variations calculated here are likely too small to be observed. It is perpendicular to the plane of the surface for both low and high temperatures. The calculations become progressively more ill-behaved as the temperatures are lowered and require more computer time for satisfactory convergence.For Fe/Cu {100}, we find the spins always prefer to point out of plane. Experimental results in general are consistent with this view, although the systems seem to be difficult to prepare.

Spin-polarized Scanning Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 768-769
Author(s):  
Kazuyuki Koike ◽  
Hideo Matsuyama
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Speed ◽  
Magnetic Thin Films ◽  
Electron Spin Polarization ◽  
Acquisition Time ◽  
Magnetization Direction ◽  
Spin Polarized ◽  
Conventional Methods ◽  
Scanning Electron

Spin-polarized scanning electron microscopy (spin SEM), where the secondary electron spin polarization is used as the image signal, is a novel technique for magnetic domain observation. Since its first development by Koike and Hayakawa in 1984, several laboratories have extensively studied this technique and have greatly improved its capability for data extraction and its range of applications. This paper reviews the progress over the last few years.Almost all the high expectations initially held for spin SEM have been realized. A spatial resolution of several hundreds angstroms has been attained, which is nearly one order of magnitude higher than that of conventional methods for thick samples. Quantitative analysis of magnetization direction has been performed more easily than with conventional methods. Domain observation of the surface of three-dimensional samples has been confirmed to be possible. One of the drawbacks, a long image acquisition time, has been eased by combining highspeed image-signal processing with high speed scanning, although at the cost of image quality. By using spin SEM, the magnetic structure of a 180 degrees surface Neel wall, magnetic thin films, multilayered films, magnetic discs, etc., have been investigated.

scholarly journals Manipulation of hot carrier cooling dynamics in two-dimensional Dion–Jacobson hybrid perovskites via Rashba band splitting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jun Yin ◽  
Rounak Naphade ◽  
Partha Maity ◽  
Luis Gutiérrez-Arzaluz ◽  
Dhaifallah Almalawi ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Phonon Scattering ◽  
Transient Absorption Spectroscopy ◽  
Band Model ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Hot Carrier ◽  
Band Splitting ◽  
Perovskite Materials ◽  
Spin Polarized

AbstractHot-carrier cooling processes of perovskite materials are typically described by a single parabolic band model that includes the effects of carrier-phonon scattering, hot phonon bottleneck, and Auger heating. However, little is known (if anything) about the cooling processes in which the spin-degenerate parabolic band splits into two spin-polarized bands, i.e., the Rashba band splitting effect. Here, we investigated the hot-carrier cooling processes for two slightly different compositions of two-dimensional Dion–Jacobson hybrid perovskites, namely, (3AMP)PbI4 and (4AMP)PbI4 (3AMP = 3-(aminomethyl)piperidinium; 4AMP = 4-(aminomethyl)piperidinium), using a combination of ultrafast transient absorption spectroscopy and first-principles calculations. In (4AMP)PbI4, upon Rashba band splitting, the spin-dependent scattering of hot electrons is responsible for accelerating hot-carrier cooling at longer delays. Importantly, the hot-carrier cooling of (4AMP)PbI4 can be extended by manipulating the spin state of the hot carriers. Our findings suggest a new approach for prolonging hot-carrier cooling in hybrid perovskites, which is conducive to further improving the performance of hot-carrier-based optoelectronic and spintronic devices.

scholarly journals Transport signatures of bulk topological phases in double Rashba nanowires probed by spin-polarized STM

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Manisha Thakurathi ◽  
Denis Chevallier ◽  
Daniel Loss ◽  
Jelena Klinovaja
Keyword(s):  
Topological Phases ◽  
Spin Polarized

scholarly journals Van der Waals electride: Toward intrinsic two-dimensional ferromagnetism of spin-polarized anionic electrons

2021 ◽  
pp. 100473
Author(s):  
Hyun Yong Song ◽  
Byung Il Yoo ◽  
Jin-Ho Choi ◽  
Se-Hwang Kang ◽  
Joonho Bang ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Two Dimensional ◽  
Spin Polarized
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