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J. Res. Nat. Bur. Stand; v. 76B(1); p. 61-80
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[en] A general spinor interaction with gravitation which includes both Einstein's and Cartan's theories as special cases is discussed. The coupling of torsion to matter field in the new theory has an arbitrary strength which can only be determined by experiment. (author)
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Journal of Physics. A, Mathematical and General; ISSN 0305-4470;
; v. 11(12); p. 2385-2388

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[en] We have been developing computational methods to calculate electronic structures of molecules using relativistic effective core potentials with spin-orbit terms. Since spin-orbit interactions are contained in the Hamiltonian employed to derive one electron wavefunctions, orbitals in the present method become two-component spinors confirmining the double group symmetry. Starting from the HF method using two-component molecular spinors, the present scheme has been extended to relativistic MP2 and CI methods. These two-component methods are especially useful to study the interplay between spin-orbit and correlation effects on molecular structures and properties. Results calculated by the present methods are available for many diatomic molecules and a few polyatomic systems
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Anon; 90 p; 1996; p. 1, Paper TuP 2; Louisiana State University; Baton Rouge, LA (United States); 2. international congress on theoretical chemical physics; New Orleans, LA (United States); 9-13 Mar 1996
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[en] We investigate the localization-delocalization transition of a two-dimensional system with spin-orbit interaction (SOI) in a perpendicular magnetic field. We find that if the system is set between two Landau levels, the increase of SOI strength g can drive the system first from localization state into delocalization state, then back to localization state. Scaling analysis shows that near the transition points the behavior of the correlation length ξ can be well described by function ξ=Aexp(α vertical bar gc-g vertical bar), with vertical bar gc-g vertical bar being the distance from the transition point, A being a constant and α being exponent, suggests that Kosterlitz-Thouless nature of the transitions, different from the continuous transition in the absence of the magnetic field
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S0375-9601(05)00888-1; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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[en] We have extended the considerable computational advantages of separable, nonlocal pseudopotentials to the calculation of spin-orbit splittings in solids. We write the total ionic pseudopotential as a sum of scalar relativistic and spin-orbit contributions, where each term can be represented by a fully nonlocal potential of the separable Kleinman-Bylander (KB) form. The scalar term, which reduces to the standard KB expression for the pseudopotential in the limit where one can neglect spin-orbit interactions, is used in the local-density approximation to calculate zeroth-order electronic properties in the usual way, and spin-orbit splittings are calculated to first order using perturbation theory. We have tested our procedure by calculating the spin-orbit splittings at high symmetry points of the zinc-blende III-V semiconductors GaAs, InAs, AlSb, GaSb, and InSb. The calculated splittings in all cases are in excellent agreement with those obtained from other first-principles calculations and with experiment. Since our spin-orbit operator is fully nonlocal in both radial and angular coordinates, a considerable reduction in the labor required to calculate matrix elements has been achieved. This makes our approach ideally suited for use with ab initio molecular-dynamics techniques, which currently have become the methods of choice for exploring the electronic and structural properties of solids
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Original Title
Drehimpulsausrichtung und Corioliskopplung
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Bergakademie Freiberg (German Democratic Republic). Sektion Physik; Friedrich-Schiller-Universitaet, Jena (German Democratic Republic). Sektion Physik; Humboldt-Universitaet, Berlin (German Democratic Republic). Sektion Physik; Karl-Marx-Universitaet, Leipzig (German Democratic Republic). Sektion Physik; Technische Univ., Dresden (German Democratic Republic). Sektion Physik; Akademie der Wissenschaften der DDR, Leipzig. Zentralinstitut fuer Isotopen- und Strahlenforschung; Zentralinstitut fuer Kernforschung, Rossendorf bei Dresden (German Democratic Republic); p. 77-78; Aug 1976; Published in summary form only.
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[en] The substrate contribution to the magnetic anisotropy energy (MAE) of supported nanostructures can be assessed by a site-selective manipulation of the spin–orbit coupling (SOC) and of the effective exchange field Bex. A systematic study of Co adatoms and Co monolayers on the (1 1 1) surfaces of Cu, Ag, Au, Pd and Pt is performed to study common trends in this class of materials. It is found that for adatoms, the influence of the substrate SOC and Bex is relatively small (10–30% of the MAE) while for monolayers, this influence can be substantial. The influence of the substrate SOC is much more important than the influence of the substrate Bex, except for highly polarizable substrates with a strong SOC (such as Pt). The substrate always promotes the tendency to an out-of-plane orientation of the easy magnetic axis for all the investigated systems. (paper)
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Available from http://dx.doi.org/10.1088/0953-8984/26/19/196002; Country of input: International Atomic Energy Agency (IAEA)
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Mouillon, Alexandre
Universite de Grenoble Alpes, 621 Av. Centrale, 38400 Saint-Martin-d'Heres (France); CEA, DRF-INAC (France)2019
Universite de Grenoble Alpes, 621 Av. Centrale, 38400 Saint-Martin-d'Heres (France); CEA, DRF-INAC (France)2019
AbstractAbstract
[en] Experimentally demonstrated in the early 2010's, spin-orbit torques (SOTs) very quickly generated a very strong interest in the magnetism and spin electronics community. Indeed, they allow, in a heavy metal/ferromagnetic metal/oxide (HM/FM/Ox) multilayer, to manipulate the magnetization of the ferromagnetic layer (FM) by injecting an in-plane current. Noting that the FM/Ox bilayer corresponds to half of a typical stack used in MRAM memory cells (Magnetic Random Access Memory), we understand that this mechanism is very interesting for writing the free layer of these cells. Indeed, the writing current no longer crosses the tunnel barrier, which naturally responds to some of the limitations of current MRAMs. However, the physical interpretation of these phenomena has proved to be particularly complex. These torques have two components, generally called 'Field-like', FL, and 'Damping-like', DL. While initially, theoretical studies predicted that the DL component was mainly due to a volume effect in the HM layer, and the FL component was mainly due to an interface effect, more recent experimental studies have shown that it is not so simple to separate these two contributions.In this thesis work, we have chosen an original approach that allows us to study only one of the two contributions. To do so, we have chosen to focus on the interfacial contribution by studying Ox1/FM/Ox2 samples. We were thus able to highlight in these stacks the presence of SOTs, which was not so obvious in a structure that did not contain heavy metal and also had a strong symmetry. On the other hand, we were able to show that only the FL component of these couples was present. The unexpected behaviour of this FL-SOT as a function of the thickness of the FM layer led us to propose a model based on the combination of a Rahsba interfacial effect and a quantum confinement effect due to the very thin thickness of conductive material in these multilayers. (author)
[fr]
Mis en evidence experimentalement au debut des annees 2010, les couples de spin-orbite (SOTs) ont tres rapidement suscite un tres fort interet dans la communaute du magnetisme et de l'electronique de spin. En effet, ils permettent, dans un empilement de type metal lourd/metal ferromagnetique/oxyde (HM/FM/Ox), de manipuler l'aimantation de la couche ferromagnetique (FM) en injectant un courant dans le plan des couches. En remarquant que la bicouche FM/Ox correspond a la moitie d'un empilement typique utilise dans les cellules memoires de types MRAM (Magnetic Random Access Memory, memoire magnetique a acces aleatoire), on comprend que ce mecanisme est tres interessant pour l'ecriture de la couche libre de ces cellules. En effet, le courant d'ecriture ne traverse plus la barriere tunnel, ce qui repond naturellement a certaines limitations des MRAM actuelles. L'interpretation physique de ces phenomenes s'est cependant revelee particulierement complexe. Ces couples ont deux composantes, generalement appelee 'Field-like', FL, et 'Damping-like', DL. Si dans un premier temps, les etudes theoriques ont predit que la composante DL provenait principalement d'un effet de volume dans la couche HM, et que la composante FL provenait principalement d'un effet d'interface, des etudes experimentales plus recentes ont montre qu'il n'etait pas si simple de separer ces deux contributions. Dans ce travail de these, nous avons choisi une approche originale permettant de n'etudier qu'une seule des deux contributions. Pour ce faire, nous avons choisi de nous concentrer sur la contribution interfaciale en etudiant des echantillons de types Ox1/FM/Ox2. Nous avons ainsi pu mettre en evidence dans ces empilements la presence de SOTs ce qui n'etait a priori pas si evident dans une structure ne contenant pas de metal lourd et presentant de surcroit une forte symetrie. D'autre part, nous avons pu montrer que seule la composante FL de ces couples etait presente. Le comportement inattendu de ce FL-SOT en fonction de l'epaisseur de la couche FM, nous a conduit a proposer un modele base sur la combinaison d'un effet interfacial de type Rahsba et d'un effet de confinement quantique du a la tres faible epaisseur de materiau conducteur dans ces empilementsOriginal Title
Couples de spin-orbite dans une couche de metal ferromagnetique ultramince comprise entre deux oxydes: confinement quantique et effet Rashba
Source
9 Jul 2019; 166 p; 161 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; Physique de la Matiere Condensee et du Rayonnement
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Dehghan, E.; Sanavi Khoshnoud, D.; Naeimi, A.S., E-mail: dskhoshnoud@semnan.ac.ir2018
AbstractAbstract
[en] The spin-resolved electron transport through a triangular network of quantum nanorings is studied in the presence of Rashba spin-orbit interaction (RSOI) and a magnetic flux using quantum waveguide theory. This study illustrates that, by tuning Rashba constant, magnetic flux and incoming electron energy, the triangular network of quantum rings can act as a perfect logical spin-filtering with high efficiency. By changing in the energy of incoming electron, at a proper value of the Rashba constant and magnetic flux, a reverse in the direction of spin can take place in the triangular network of quantum nanorings. Furthermore, the triangular network of quantum nanorings can be designed as a device and shows several simultaneous spintronic properties such as spin-splitter and spin-inverter. This spin-splitting is dependent on the energy of the incoming electron. Additionally, different polarizations can be achieved in the two outgoing leads from an originally incoming spin state that simulates a Stern-Gerlach apparatus.
Source
S0921452617306713; Available from http://dx.doi.org/10.1016/j.physb.2017.09.076; Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Margulis, V. A.; Mironov, V. A., E-mail: theorphysics@mrsu.ru2009
AbstractAbstract
[en] An explicit analytic expression is derived for the magnetic moment of a 2D electron gas taking into account the spin-orbit interaction in the Rashba model with T = 0. The cases of constant chemical potential and number of electrons are investigated. The magnetic field and temperature dependences of the magnetic moment are analyzed. The results are compared with the results of experimental studies of magnetization
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Copyright (c) 2009 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Journal of Experimental and Theoretical Physics; ISSN 1063-7761;
; CODEN JTPHES; v. 108(4); p. 656-660

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