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We consider spin effects related to the random spin-orbit interaction in graphene. Such a random interaction can result from the presence of ripples and/or other inhomogeneities at the graphene surface. We show that the random spin-orbit…

介观与纳米尺度物理 · 物理学 2015-05-20 V. K. Dugaev , E. Ya. Sherman , J. Barnas

The model of Composite Fermions for describing interacting electrons in two dimensions in the presence of a magnetic field is described. In this model, charged Fermions are combined with an even number of magnetic flux quanta in such a way…

介观与纳米尺度物理 · 物理学 2007-05-23 B. Kramer , N. Magnoli , E. Mariani , M. Merlo , F. Napoli , M. Sassetti

We report the first experimental demonstration that interface microstructure limits diffusive electrical spin injection efficiency across heteroepitaxial interfaces. A theoretical treatment shows that the suppression of spin injection due…

We develop a time-dependent nonequilibrium Green function (NEGF) approach to the problem of spin pumping by precessing magnetization in one of the ferromagnetic layers within F/I/F magnetic tunnel junctions (MTJs) or F/I/N semi-MTJs in the…

介观与纳米尺度物理 · 物理学 2014-12-08 Farzad Mahfouzi , Jaroslav Fabian , Naoto Nagaosa , Branislav K. Nikolic

Generalised hydrodynamics predicts universal ballistic transport in integrable lattice systems when prepared in generic inhomogeneous initial states. However, the ballistic contribution to transport can vanish in systems with additional…

统计力学 · 物理学 2017-07-14 Marko Ljubotina , Marko Znidaric , Tomaz Prosen

We demonstrate the realization of the resonant spin amplification (RSA) effect in Faraday geometry where a magnetic field is applied parallel to the optically induced spin polarization so that no RSA is expected. However, model…

介观与纳米尺度物理 · 物理学 2021-07-09 P. Schering , E. Evers , V. Nedelea , D. S. Smirnov , E. A. Zhukov , D. R. Yakovlev , M. Bayer , G. S. Uhrig , A. Greilich

In measurements of small signals using spin precession the precession angle usually grows linearly in time. We show that non-linear interactions between particles can lead to an exponentially growing spin precession angle, resulting in an…

原子物理 · 物理学 2009-11-10 M. P. Ledbetter , I. M. Savukov , M. V. Romalis

We report direct electrical detection of spin pumping, using a lateral normal metal/ferromagnet/normal metal device, where a single ferromagnet in ferromagnetic resonance pumps spin polarized electrons into the normal metal, resulting in…

介观与纳米尺度物理 · 物理学 2009-11-11 M. V. Costache , M. Sladkov , S. M. Watts , C. H. van der Wal , B. J. van Wees

We consider properties of a two-dimensional electron system in a random magnetic field. It is assumed that the magnetic field not only influences orbital electron motion but also acts on the electron spin. For calculations, we suggest a new…

介观与纳米尺度物理 · 物理学 2009-11-07 Kazutaka Takahashi , K. B. Efetov

One of the cornerstone effects in spintronics is spin pumping by dynamical magnetization that is steadily precessing (around, e.g., the $z$-axis) with frequency $\omega_0$, due to absorption of low-power microwaves of frequency $\omega_0$…

介观与纳米尺度物理 · 物理学 2023-08-15 Jalil Varela Manjarres , Branislav K. Nikolic

We derive boundary conditions for the coupled spin-charge diffusion equations at a transmitting interface between two-dimensional electron systems with different strengths of the Rashba spin-orbit (SO) coupling $\alpha$, and an electric…

材料科学 · 物理学 2009-11-11 Yaroslav Tserkovnyak , Bertrand I. Halperin , Alexey A. Kovalev , Arne Brataas

The spin accumulation in an n-GaAs channel produced by spin extraction into a (Ga,Mn)As contact is measured by cross-sectional imaging of the spin polarization in GaAs. The spin polarization is observed in a 1 \mum thick n-GaAs channel with…

In ferromagnet/normal metal heterostructures, spin pumping and spin-transfer torques are two reciprocal processes that occur concomitantly. Their interplay introduces a dynamic feedback effect interconnecting energy dissipation channels of…

介观与纳米尺度物理 · 物理学 2016-08-25 Ran Cheng , Jian-Gang Zhu , Di Xiao

The friction drag reduction in a turbulent channel flow generated by surface-mounted rotating disc actuators is investigated numerically. The wall arrangement of the discs has a complex and unexpected effect on the flow. For low disc-tip…

流体动力学 · 物理学 2021-01-21 Daniel J. Wise , Claudia Alvarenga , Pierre Ricco

From a simple model for the driven motion of a planar interface under the influence of a diffusion field we derive a damped nonlinear oscillator equation for the interface position. Inside an unstable regime, where the damping term is…

介观与纳米尺度物理 · 物理学 2015-06-03 Alexander L. Korzhenevskii , Richard Bausch , Rudi Schmitz

Effective spin mixing conductance (ESMC) across the nonmagnetic metal (NM)/ferromagnet interface, spin Hall conductivity (SHC) and spin diffusion length (SDL) in the NM layer govern the functionality and performance of pure spin current…

材料科学 · 物理学 2016-09-02 L. Ma , H. A. Zhou , L. Wang , X. L. Fan , W. J. Fan , D. S. Xue , K. Xia , G. Y. Guo , S. M. Zhou

Spin pumping and spin-transfer torques are two reciprocal phenomena widely studied in ferromagnetic materials. However, pumping from antiferromagnets and its relation to current-induced torques have not been explored. By calculating how…

介观与纳米尺度物理 · 物理学 2014-08-04 Ran Cheng , Jiang Xiao , Qian Niu , Arne Brataas

We discuss a joint microscopic theory for the laser-induced magnetization dynamics and spin transport in magnetic heterostructures based on the $s$-$d$ interaction. Angular momentum transfer is mediated by scattering of itinerant $s$…

介观与纳米尺度物理 · 物理学 2020-09-24 Maarten Beens , Rembert A. Duine , Bert Koopmans

The identification of platforms with independently tunable nonlinearity and non-Hermiticity promises a quantitative route to far-from-equilibrium universality across many-body systems. Here we show that a conventional ferromagnetic…

介观与纳米尺度物理 · 物理学 2026-03-16 Vincent Flynn , Benedetta Flebus

We show that a supercurrent carried by spinless singlet Cooper pairs can induce a spin accumulation in the normal metal interlayer of a Josephson junction. This phenomenon occurs when a nonequilibrium spin-energy mode is excited in the…

超导电性 · 物理学 2020-10-07 Morten Amundsen , Jacob Linder