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We observe spin-valve-like effects in nano-scaled thermally evaporated Co/AlOx/Au tunnel junctions. The tunneling magnetoresistance is anisotropic and depends on the relative orientation of the magnetization direction of the Co electrode…

Popular Physics · Physics 2015-05-13 R. S. Liu , L. Michalak , C. M. Canali , L. Samuelson , H. Pettersson

We demonstrate efficient spin-polarized tunneling between a ferromagnetic metal and a ferromagnetic semiconductor with highly mismatched conductivities. This is indicated by a large tunneling magnetoresistance (up to 30%) at low…

Materials Science · Physics 2009-11-07 S. H. Chun , S. J. Potashnik , K. C. Ku , P. Schiffer , N. Samarth

We consider spin-dependent tunneling through a gallium arsenide barrier, a material which has no inversion symmetry. We are dealing with free electrons, with one effective mass and a spin-splitting in the barrier material. When we take into…

Mesoscale and Nanoscale Physics · Physics 2009-09-29 T. L. Hoai Nguyen , Henri-Jean Drouhin , Jean-Eric Wegrowe , Guy Fishman

We developed a parametrization of transmission probability that reliably captures essential elements of the tunneling process in magnetic tunnel junctions. The electronic structure of Fe/MgO system is calculated within the quasiparticle…

Materials Science · Physics 2012-01-31 Sergey V. Faleev , Oleg N. Mryasov , Mark van Schilfgaarde

The ground state of a graphene sheet at charge neutrality in a perpendicular magnetic field remains enigmatic, with various experiments supporting canted antiferromagnetic, bond ordered, and even charge density wave phases. A promising…

Mesoscale and Nanoscale Physics · Physics 2022-05-03 Arup Kumar Paul , Manas Ranjan Sahu , Kenji Watanabe , Takashi Taniguchi , J. K. Jain , Ganpathy Murthy , Anindya Das

We combine Z-contrast scanning transmission electron microscopy with density-functional-theory calculations to determine the atomic structure of the Fe/AlGaAs interface in spin-polarized light-emitting diodes. A 44% increase in…

Injection and detection of spin accumulation in a semiconductor having localized states at the interface is evaluated. Spin transport from a ferromagnetic contact by sequential, two-step tunneling via interface states is treated not in…

Mesoscale and Nanoscale Physics · Physics 2015-06-04 R. Jansen , A. M. Deac , H. Saito , S. Yuasa

Antiferromagnetic spintronics offers the potential for higher-frequency operations and improved insensitivity to magnetic fields compared to ferromagnetic spintronics. However, previous electrical techniques to detect antiferromagnetic…

Interface states at a boundary between regions with different spin-orbit interactions (SOIs) in two-dimensional (2D) electron systems are investigated within the one-band effective mass method with generalized boundary conditions for…

Mesoscale and Nanoscale Physics · Physics 2011-09-21 Aleksei A. Sukhanov , Vladimir A. Sablikov

The ability to perform efficient electrical spin injection from ferromagnetic metals into two-dimensional semiconductor crystals based on transition metal dichalcogenide monolayers is a prerequisite for spintronic and valleytronic devices…

Materials Science · Physics 2018-03-29 Thomas Garandel , Rémi Arras , Xavier Marie , Pierre Renucci , Lionel Calmels

Organic multiferroic tunnel junctions (OMFTJs) with multi-resistance states have been proposed and drawn intensive interests due to their potential applications, for examples of memristor and spintronics based synapse devices. The…

Half-metallic Heusler alloy compounds with Curie temperatures above room temperature are suitable candidate electrode materials for injecting large spin-polarised charge carriers into the semiconducting barriers at the ferromagnet…

Materials Science · Physics 2025-04-23 Aloka Ranjan Sahoo , Sharat Chandra

We provide compelling evidence to establish that, contrary to one's elementary guess, the tunneling spin polarization (TSP) of amorphous CoFeB is larger than that of highly textured fcc CoFeB. First principles atomic and electronic…

We establish in a combination of ab initio theory and experiments that the tunneling process in scanning tunneling microscopy/spectroscopy on the A-122 iron pnictide superconductors - in this case BaFe$_{2-x}$Co$_x$As$_2$ - involve a strong…

The materials with spin-polarized electronic states have attracted a huge amount of interest due to their potential applications in spintronics. Based on first-principles calculations, we study the electronic characteristics of a series of…

Materials Science · Physics 2022-01-13 Shenda He , Ruirong Kang , Pan Zhou , Zehou Li , Yi Yang , Lizhong Sun

Using the transfer matrix method and the effective-mass approximation, the effect of resonant states on spin transport is studied in ZnSe/ZnMnSe/ZnSe/ZnMnSe/ZnSe structures under the influence of both electric and magnetic fields. The…

Mesoscale and Nanoscale Physics · Physics 2009-11-11 A. Saffarzadeh , M. Bahar , M. Banihasan

Electronic transport through a single-molecule magnet Mn$_{12}$ in a two-terminal set up is calculated using the non-equilibrium Green's function method in conjunction with density-functional theory. A single-molecule magnet Mn$_{12}$ is…

Materials Science · Physics 2010-01-28 Salvador Barraza-Lopez , Kyungwha Park , Víctor García-Suárez , Jaime Ferrer

We report on the spin-polarized electron injection through an Fe(100)/InAs(100) junction. The circularly polarized electroluminescence of injected electrons from epitaxially grown Fe thin film into InAs(100) in an external magnetic field is…

Discovering and engineering spin-polarised surface states in the electronic structures of condensed matter systems is a crucial first step in development of spintronic devices, wherein spin-polarised bands crossing the Fermi level can…

In considering a novel function in ferromagnetic tunnel junctions consisting of ferromagnet(FM)/barrier/FM junctions, we theoretically investigate multiple valued (or multi-level) cell property, which is in principle realized by sensing…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Satoshi Kokado , Kikuo Harigaya
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