Article
Physics, Applied
Sadamichi Maekawa, Takashi Kikkawa, Hiroyuki Chudo, Jun'ichi Ieda, Eiji Saitoh
Summary: With the advancement of spin science and spintronics research, study on spin current has become increasingly important. Spin current has been used to explain new phenomena and electronic states and to organize conventional spintronics phenomena. In this article, recent developments in spin physics, spin current, and related phenomena are discussed, with a focus on the interaction between spin angular momentum and other forms of angular momentum. The article covers topics such as spin pumping, topological Hall torque, emergent inductor, spin Seebeck and Peltier effects, and the interaction between mechanical motion and electron/nuclear spins.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Zhendong Chi, Yong-Chang Lau, Masashi Kawaguchi, Masamitsu Hayashi
Summary: The spin torque efficiency of Pt1-xBix/Co based heterostructures for spin-orbit torque (SOT) switching devices was studied, revealing that the damping-like component increases significantly with Bi concentration x, largely due to changes in layer resistivity. The spin Hall conductivity remains constant at around 830 (/e) Omega(-1) cm(-1) for 0 < x ≤ 0.6. Current-induced magnetization switching was successfully demonstrated in heterostructures, with the highest efficiency for switching a perpendicularly magnetized Co layer observed at x~0.5.
Article
Computer Science, Interdisciplinary Applications
Abdelmajid Lekdadri, Hassan Lassri
Summary: This paper presents a theoretical work based on the second quantification of spin waves in ferromagnetic/non-magnetic multilayers. The aim of this theoretical approach is to model the excitation modes of spin waves at low temperature. The study investigates the effect of the characteristic parameters of the system on the spin wave dispersion modes. It is found that spin waves located at the interfaces play a crucial role in the stability/instability of the magnetic state in the multilayers, and that dipolar interactions, interface anisotropy, and exchange interactions have a significant influence on the energy of these modes.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Physics, Applied
T. Strusch, K. Lenz, R. Meckenstock, R. Bali, J. Ehrler, J. Lindner, J. Fassbender, M. Farle, K. Potzger, A. Semisalova
Summary: In this study, we investigate the spin pumping efficiency and determine the spin mixing conductance and spin diffusion length in thin bilayer films based on 3d transition metal alloy Fe60Al40. We demonstrate that the Fe60Al40 alloy exhibits dual functionality in spin pumping structures, which may have potential value in spintronic applications.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Maria Blanco-Rey, Paolo Perna, Adrian Gudin, Jose Manuel Diez, Alberto Anadon, Pablo Olleros-Rodriguez, Leticia de Melo Costa, Manuel Valvidares, Pierluigi Gargiani, Alejandra Guedeja-Marron, Mariona Cabero, Maria Varela, Carlos Garcia-Fernandez, Mikhail M. Otrokov, Julio Camarero, Rodolfo Miranda, Andres Arnau, Jorge Cerda
Summary: The research indicates that nanometer-thick epitaxial Co films intercalated between graphene and a heavy metal substrate exhibit large perpendicular magnetic anisotropy, with stable magnetic behavior achieved through the optimization of structural defects.
ACS APPLIED NANO MATERIALS
(2021)
Article
Physics, Multidisciplinary
Yu-Hang Li, Ran Cheng
Summary: In magnetic topological insulators, quantized electronic transport is affected by magnetic ordering and magnetization controlling band gaps, and thermal spin fluctuations can significantly reduce the onset temperature of quantized transport even without structural impurities. This overlooked effect provides an alternative explanation for recent experiments on magnetic topological insulators.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ya-Ru Wang, Zheng-Chuan Wang, Gang Su
Summary: The spinor Boltzmann equation beyond gradient approximation in a ferromagnetic metal with a single domain wall is derived, along with the charge continuity equation and spin diffusion equation. A generalized spin transfer torque (STT) is obtained using the spin diffusion equation, extending the usual STT to cases beyond gradient approximation and with inhomogeneous current. Numerical calculations are performed for physical observables, and the motion of domain walls and critical electric fields are studied using the Landau-Lifshitz-Gilbert-Slonczewski equation.
Article
Materials Science, Multidisciplinary
B. Brahma, Pratap Behera, S. Ravi, R. Brahma, S. K. Srivastava
Summary: This study prepared a series of multilayer thin films to investigate the effect of Cu insertion layer on magnetic properties, and found that the coercivity values increase with the thickness of the Cu insertion layer.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Review
Chemistry, Multidisciplinary
Tianhan Liu, Paul S. Weiss
Summary: This Perspective discusses the inconsistent definitions, calculations, and analysis methods of spin polarization in chirality-induced spin selectivity (CISS). It proposes a practical and meaningful figure of merit through quantitative analysis of magnetoresistance in CISS transport studies.
Article
Chemistry, Physical
Thomas P. P. Fay, David T. T. Limmer
Summary: In this paper, a physically motivated framework is proposed to describe spin-selective recombination processes in chiral systems. Spin-selective reaction operators for recombination reactions of donor-bridge-acceptor molecules are derived based on chirality and spin-orbit coupling. It is found that spin polarization selectivity only arises in hopping-mediated electron transfer. The framework presented here can be extended to describe spin-selective recombination processes in more complex systems.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
R. Harikrishnan, Jatin Kumar Bidika, B. R. K. Nanda, Arout J. Chelvane, S. D. Kaushik, P. D. Babu, Harish Kumar Narayanan
Summary: We experimentally demonstrate the rarely observed fully compensated ferrimagnetic behavior in the half-Heusler compound (Co0.5Mn0.5)MnAl. A comprehensive structural investigation reveals the C1b structure with B2-type disorder. The magnetic measurement confirms the completely compensated ferrimagnetic behavior, which was further verified by neutron diffraction techniques. Additionally, anomalous resistivity and electronic structure analysis suggest the possibility of alternative mechanisms for electronic transport observed in certain materials.
Article
Materials Science, Multidisciplinary
Andrew Ross, Romain Lebrun, Martin Evers, Andras Deak, Laszlo Szunyogh, Ulrich Nowak, Mathias Klaeui
Summary: This study investigates the long-distance transport of thermally generated magnonic spin currents in the insulating antiferromagnetic phase of iron oxide. The research highlights the significant thermal spin transport without the need for net magnetization.
Article
Physics, Applied
S. Mantion, N. Biziere
Summary: Ferromagnetic resonance experiment was conducted to investigate the magnonic modes in a nanopatterned antidot lattice. Micro-magnetic simulations revealed that geometric imperfections and modifications induced by nanofabrication process significantly affected the frequencies and spatial profiles of the spin wave modes within the magnetic field range.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Libai Zhu, Xiaoguang Xu, Meiling Li, Kangkang Meng, Yong Wu, Jikun Chen, Yong Jiang
Summary: A spintronic device based on spin-orbit torque (SOT) has been developed for programmable multi-state logic-in-memory. By varying the thickness of different layers, multi-step magnetization switching behaviors can be achieved, and five logic gates (NOR, OR, AND, NAND, NOT) can be realized by controlling the current and magnetic field. This technology provides a simple and effective way for designing single-unit spintronic devices and extends their potential application in brain-like computations.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yinan Fang, Stefano Chesi, Mahn-Soo Choi
Summary: This study theoretically analyzes a state-of-the-art experimental method using ESR-STM to directly probe spin fluctuations in the Kondo effect, finding that sensitivity is most pronounced for probe spins with transverse magnetic anisotropy.
Article
Physics, Multidisciplinary
Marc Vila, Jose H. Garcia, Aron W. Cummings, Stephen R. Power, Christoph W. Groth, Xavier Waintal, Stephan Roche
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Marjan Macek, Philipp T. Dumitrescu, Corentin Bertrand, Bill Triggs, Olivier Parcollet, Xavier Waintal
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Thomas Kloss, Joseph Weston, Benoit Gaury, Benoit Rossignol, Christoph Groth, Xavier Waintal
Summary: Tkwant is a Python package for simulating quantum nanoelectronics devices with external time-dependent perturbations. It can handle discrete tight-binding models and solve many-body problems within the non-equilibrium Keldysh formalism. It is used for various applications such as plasmon propagation, Majorana fermion spectroscopy, and thermoelectric effects.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Jose H. Garcia, Marc Vila, Chuang-Han Hsu, Xavier Waintal, Vitor M. Pereira, Stephan Roche
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Yiqing Zhou, E. Miles Stoudenmire, Xavier Waintal
Review
Quantum Science & Technology
Hermann Edlbauer, Junliang Wang, Thierry Crozes, Pierre Perrier, Seddik Ouacel, Clement Geffroy, Giorgos Georgiou, Eleni Chatzikyriakou, Antonio Lacerda-Santos, Xavier Waintal, D. Christian Glattli, Preden Roulleau, Jayshankar Nath, Masaya Kataoka, Janine Splettstoesser, Matteo Acciai, Maria Cecilia da Silva Figueira, Kemal Oeztas, Alex Trellakis, Thomas Grange, Oleg M. Yevtushenko, Stefan Birner, Christopher Baeuerle
Summary: This review discusses the recent progress in charge manipulation in semiconductor-based nanoscale devices for realizing flying qubits with single electrons. The concept and most promising realizations of electron flying qubits are introduced, and the application of numerical simulations in accelerating experimental development cycles is demonstrated. The technological challenges faced by academia and quantum enterprises in developing flying qubits are addressed, emphasizing the importance of interdisciplinary cooperation. The review consists of two main sections: pathways towards electron flying qubits and numerical modeling of quantum devices.
EPJ QUANTUM TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Yuriel Nunez Fernandez, Matthieu Jeannin, Philipp T. Dumitrescu, Thomas Kloss, Jason Kaye, Olivier Parcollet, Xavier Waintal
Summary: This paper uses tensor network techniques to obtain high-order perturbative diagrammatic expansions for the quantum many-body problem at very high precision. The results show that this technique outperforms diagrammatic quantum Monte Carlo in terms of precision and speed by orders of magnitude, and it is applicable in parameter regimes with strongly oscillatory integrals.
Article
Quantum Science & Technology
Thomas Ayral, Thibaud Louvet, Yiqing Zhou, Cyprien Lambert, E. Miles Stoudenmire, Xavier Waintal
Summary: We present a density-matrix renormalization group (DMRG) algorithm for simulating quantum circuits. It extends the time-dependent DMRG algorithm from Hermitian Hamiltonian matrices to quantum circuits defined by unitary matrices. The technique is exact for small circuit depths and approximate for larger depths, but offers an exponential speed up in computational time. The fidelity of the DMRG results depends strongly on the quantum circuit, and the algorithm can generate high-quality bit strings even for the most difficult circuits.
Article
Physics, Multidisciplinary
Eleni Chatzikyriakou, Junliang Wang, Lucas Mazzella, Antonio Lacerda-Santos, Maria Cecilia da Silva Figueira, Alex Trellakis, Stefan Birner, Thomas Grange, Christopher Bauerle, Xavier Waintal
Summary: In this work, the predictive power of numerical simulations in quantum nanoelectronics is evaluated by comparing the results with a large experimental dataset. A robust one-parameter model that can be calibrated in situ is developed based on the critical review of the modeling.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
I. M. Flor, A. Lacerda-Santos, G. Fleury, P. Roulleau, X. Waintal
Summary: Recent experiments have shown that electronic Mach-Zehnder interferometers of unprecedented fidelities could be built using a graphene pn junction in the quantum Hall regime. The separation between two different edge states in the junction is abnormally high and is independent of the exchange splitting value, being governed entirely by the sample geometry.
Article
Physics, Multidisciplinary
Marc Vila, Chuang-Han Hsu, Jose H. Garcia, L. Antonio Benitez, Xavier Waintal, Sergio O. Valenzuela, Vitor M. Pereira, Stephan Roche
Summary: This study reveals a novel canted spin Hall effect in few-layer MoTe2 and WTe2 materials, characterized by in-plane and out-of-plane spin polarizations. The decreased symmetry of these materials leads to a large gate-tunable figure of merit for the spin Hall effect, showing potential for applications in spintronic devices.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Pacome Armagnat, Xavier Waintal
JOURNAL OF PHYSICS-MATERIALS
(2020)
Article
Physics, Multidisciplinary
Mathieu Istas, Christoph Groth, Xavier Waintal
PHYSICAL REVIEW RESEARCH
(2019)
Article
Optics
Renaud Chretien, Josef Rammensee, Julien Dujardin, Cyril Petitjean, Peter Schlagheck
Article
Physics, Multidisciplinary
Mathieu Istas, Christoph Groth, Anton R. Akhmerov, Michael Wimmer, Xavier Waintal
