Thermopower and Thermally Induced Domain Wall Motion in (Ga,Mn)As (2009)
Hals, Kjetil M. D., Brataas, Arne, Bauer, Gerrit E. W.
We study two reciprocal thermal effects in the ferromagnetic semiconductor (Ga,Mn)As by scattering theory: domain wall motion induced by a temperature gradient as well as heat currents pumped by a...
Nanoscale Magnetic Heat Pumps and Engines (2009)
Bauer, Gerrit E. W., Bretzel, Stefan, Brataas, Arne, Tserkovnyak, Yaroslav
We present the linear response matrix for a sliding domain wall in a rotatable magnetic nanowire, which is driven out of equilibrium by temperature and voltage bias, mechanical torque, and magnetic...
Crossed Andreev Reflection versus Electron Transfer in Graphene Nanoribbons (2009)
Haugen, Håvard, Huertas-Hernando, Daniel, Brataas, Arne, Waintal, Xavier
We investigate the transport properties of three-terminal graphene devices, where one terminal is superconducting and two are normal metals. The terminals are connected by zigzag nanoribbons....
Inverse Spin Hall Effect in SNS Josephson Junctions (2009)
Mal'shukov, A. G., Sadjina, Severin, Brataas, Arne
We consider DC supercurrents in SNS junctions. Spin-orbit coupling in combination with Zeeman fields can induce an effective vector potential in the normal conductor. As a consequence, an...
Barnett Effect in Thin Magnetic Films and Nanostructures (2009)
Bretzel, Stefan, Bauer, Gerrit E. W., Tserkovnyak, Yaroslav, Brataas, Arne
The Barnett effect refers to the magnetization induced by rotation of a demagnetized ferromagnet. We describe the location and stability of stationary states in rotating nanostructures using the...
Scattering Theory of Charge-Current Induced Magnetization Dynamics (2009)
Hals, Kjetil M. D., Brataas, Arne, Tserkovnyak, Yaroslav
In ferromagnets, charge currents can excite magnons via the spin-orbit coupling. We develop a novel and general scattering theory of charge current induced macrospin magnetization torques in normal...
Noise and dissipation in magnetoelectronic nanostructures (2009)
Foros, Jorn, Brataas, Arne, Bauer, Gerrit E. W., Tserkovnyak, Yaroslav
We study the coupled current and magnetization noise in magnetic nanostructures by magnetoelectronic circuit theory. Spin current fluctuations, which depend on the magnetic configuration, are found...
Colored thermal voltage noise in spin valves (2009)
Xiao, Jiang, Bauer, Gerrit E. W., Maekawa, Sadamichi, Brataas, Arne
The pumping of spins by moving magnetizations is shown to introduce color on top of the thermal white noise (Johnson-Nyquist) electronic power spectrum of spin valves. The magnetization related noise...
Full counting statistics of crossed Andreev reflection (2009)
Morten, Jan Petter, Huertas-Hernando, Daniel, Belzig, Wolfgang, Brataas, Arne
We calculate the full transport counting statistics in a three-terminal tunnel device with one superconducting source and two normal-metal or ferromagnet drains. We obtain the transport probability...
Hall Effect in spinor condensates (2009)
Taillefumier, Mathieu, Dahl, Eskil K., Brataas, Arne, Hofstetter, Walter
We consider a neutral spinor condensate moving in a periodic magnetic field. The spatially dependent magnetic field induces an effective spin dependent Lorentz force which in turn gives rise to a...
Intrinsic Current-Domain Wall Motion Coupling in Dirty (Ga,Mn)As (2008)
Hals, Kjetil M. D, Nguyen, Anh Kiet, Brataas, Arne
We consider current-induced domain wall motion and, the reciprocal process, moving domain wall-induced current. The associated Onsager coefficients are expressed in terms of scattering matrices....
Scattering Theory of Gilbert Damping (2008)
Brataas, Arne, Tserkovnyak, Yaroslav, Bauer, Gerrit E. W.
The magnetization dynamics of a single domain ferromagnet in contact with a thermal bath is studied by scattering theory. We recover the Landau-Liftshitz-Gilbert equation and express the effective...
Current-induced noise and damping in non-uniform ferromagnets (2008)
Foros, Jorn, Brataas, Arne, Tserkovnyak, Yaroslav, Bauer, Gerrit E. W.
In the presence of spatial variation of the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order...
Proximity effect-assisted absorption of spin currents in superconductors (2007)
Morten, Jan Petter, Brataas, Arne, Bauer, Gerrit E. W., Belzig, Wolfgang, Tserkovnyak, Yaroslav
The injection of pure spin current into superconductors by the dynamics of a ferromagnetic contact is studied theoretically. Taking into account suppression of the order parameter at the interfaces...
Circuit theory for crossed Andreev reflection and nonlocal conductance (2007)
Morten, Jan Petter, Brataas, Arne, Belzig, Wolfgang
Nonlocal currents, in devices where two normal metal terminals are contacted to a superconductor, are determined using the circuit theory of mesoscopic superconductivity. We calculate the conductance...
External Control of a Metal-Insulator Transition in GaMnAs Wires (2007)
Nguyen, Anh Kiet, Brataas, Arne
Quantum transport in disordered ferromagnetic (III,Mn)V semiconductors is studied theoretically. Mesoscopic wires exhibit an Anderson disorder-induced metal-insulator transition that can be...
Theory of current-driven magnetization dynamics in inhomogeneous ferromagnets (2007)
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W.
We give a brief account of recent developments in the theoretical understanding of the interaction between electric currents and inhomogeneous ferromagnetic order parameters. We start by discussing...
Spin Injection in Quantum Wells with Spatially Dependent Rashba Interaction (2007)
Brataas, Arne, Mal'shukov, A. G., Tserkovnyak, Yaroslav
We consider Rashba spin-orbit effects on spin transport driven by an electric field in semiconductor quantum wells. We derive spin diffusion equations that are valid when the mean free path and the...
Spin transport in proximity induced ferromagnetic graphene (2007)
Haugen, H., Huertas-Hernando, Daniel, Brataas, Arne
Magnetic gates in close proximity to graphene can induce ferromagnetic correlations. We study the effect of such induced magnetization dependent Zeeman splittings on the graphene transport...
Spin injection and relaxation in a mesoscopic superconductor (2007)
Poli, N., Morten, J. P., Urech, M., Brataas, Arne, Haviland, D. B., Korenivski, V.
We study spin accumulation and spin relaxation in a superconducting nanowire. Spins are injected and detected by using a set of magnetic tunnel contact electrodes, closely spaced along the nanowire....
Spin relaxation times in disordered graphene (2007)
Huertas-Hernando, Daniel, Guinea, Francisco, Brataas, Arne
We consider two mechanisms of spin relaxation in disordered graphene. i) Spin relaxation due to curvature spin orbit coupling caused by ripples. ii) Spin relaxation due to the interaction of the...
Magnetization damping in a local-density approximation (2006)
Skadsem, Hans Joakim, Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W.
The linear response of itinerant transition metal ferromagnets to transverse magnetic fields is studied in a self-consistent adiabatic local-density approximation. The susceptibility is calculated...
Spin transport in mesoscopic rings with inhomogeneous spin-orbit coupling (2006)
Tserkovnyak, Yaroslav, Brataas, Arne
We revisit the problem of electron transport through mesoscopic rings with spin-orbit (SO) interaction. In the well-known path-integral approach, the scattering states for a quasi-1D ring with...
Tserkovnyak, Yaroslav, Halperin, Bertrand I., Kovalev, Alexey A., Brataas, Arne
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...
Kovalev, Alexey A., Bauer, Gerrit E. W., Brataas, Arne
We study theoretically the detection and possible utilization of electric current-induced mechanical torques in ferromagnetic-normal metal heterostructures that are generated by spin-flip scattering...
Voltage generation by ferromagnetic resonance (2006)
Wang, Xuhui, Bauer, Gerrit E. W., Van Wees, Bart J., Brataas, Arne, Tserkovnyak, Yaroslav
A ferromagnet can resonantly absorbs rf radiation to sustain a steady precession of the magnetization around an internal or applied magnetic field. We show that under these ferromagnetic resonance...
Circuit theory of crossed Andreev reflection (2006)
Morten, Jan Petter, Brataas, Arne, Belzig, Wolfgang
We consider transport in a three terminal device attached to one superconducting and two normal metal terminals, using the circuit theory of mesoscopic superconductivity. We compute the nonlocal...
Giant current-driven domain wall mobility in (Ga,Mn)As (2006)
Nguyen, Anh Kiet, Skadsem, Hans Joakim, Brataas, Arne
We study theoretically hole current-driven domain wall dynamics in (Ga,Mn)As. We show that the spin-orbit coupling causes significant hole reflection at the domain wall, even in the adiabatic limit...
Resistance noise in spin valves (2006)
Foros, Jorn, Brataas, Arne, Bauer, Gerrit E. W., Tserkovnyak, Yaroslav
Fluctuations of the magnetization in spin valves are shown to cause resistance noise that strongly depends on the magnetic configuration. Due to the applied external field and the dynamic exchange...
Non-collinear Magnetoelectronics (2006)
Brataas, Arne, Bauer, Gerrit E. W., Kelly, Paul J.
The electron transport properties of hybrid ferromagnetic|normal metal structures such as multilayers and spin valves depend on the relative orientation of the magnetization direction of the...
Intrinsic Domain Wall Resistance in Ferromagnetic Semiconductors (2006)
Nguyen, Anh Kiet, Shchelushkin, R. V., Brataas, Arne
Transport through zincblende magnetic semiconductors with magnetic domain walls is studied theoretically. We show that these magnetic domain walls have an intrinsic resistance due to the spin-orbit...
Current-induced magnetization dynamics in disordered itinerant ferromagnets (2005)
Tserkovnyak, Yaroslav, Skadsem, Hans Joakim, Brataas, Arne, Bauer, Gerrit E. W.
Current-driven magnetization dynamics in ferromagnetic metals are studied in a self-consistent adiabatic local-density approximation in the presence of spin-conserving and spin-dephasing impurity...
Magnetomechanical Torques in Small Magnetic Cantilevers (2005)
Kovalev, Alexey A., Bauer, Gerrit E. W., Brataas, Arne
We study the dnamics of small magnetic cantilevers, either made from Si covered by a magnetic film or entirely ferromagnetic ones. The magnetomechanical torques are found to cause line splittings in...
Spin Hall effect, Hall effect and spin precession in diffusive normal metals (2005)
Shchelushkin, R. V., Brataas, Arne
We study transport in normal metals in an external magnetic field. This system exhibits an interplay between a transverse spin imbalance (spin Hall effect) caused by the spin-orbit interaction, a...
Perpendicular spin valves with ultra-thin ferromagnetic layers (2005)
Kovalev, Alexey A., Bauer, Gerrit E. W., Brataas, Arne
We address two finite size effects in perpendicular transport through magnetic multilayers. When the magnetic layer thickness in spin valves becomes of the order or smaller than the spin-flip...
Spin accumulation and decay in magnetic Schottky barriers (2005)
Bauer, Gerrit E. W., Tserkovnyak, Yaroslav, Brataas, Arne, Ren, Jun, Xia, Ke, Zwierzycki, Maciej, ...
The theory of charge and spin transport in forward-biased Schottky barriers reveals characteristic and experimentally relevant features. The conductance mismatch is found to enhance the current...
Current-induced macrospin vs spin-wave excitations in spin valves (2005)
Brataas, Arne, Tserkovnyak, Yaroslav, Bauer, Gerrit E. W.
The mode dependence of current-induced magnetic excitations in spin valves is studied theoretically. The torque exerted on the magnetization by transverse spin currents as well as the Gilbert damping...
Magnetization noise in magnetoelectronic nanostructures (2005)
Foros, Jorn, Brataas, Arne, Tserkovnyak, Yaroslav, Bauer, Gerrit E. W.
By scattering theory we show that spin current noise in normal electric conductors in contact with nanoscale ferromagnets increases the magnetization noise by means of a fluctuating spin-transfer...
Nonlocal magnetization dynamics in ferromagnetic heterostructures (2004)
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W., Halperin, Bertrand I.
Two complementary effects modify the GHz magnetization dynamics of nanoscale heterostructures of ferromagnetic and normal materials relative to those of the isolated magnetic constituents: On the one...
Spin Hall effects in diffusive normal metals (2004)
Shchelushkin, R. V., Brataas, Arne
We consider spin and charge flow in normal metals. We employ the Keldysh formalism to find transport equations in the presence of spin-orbit interaction, interaction with magnetic impurities, and...
Spontaneous-Symmetry-Breaking Mechanism of Adiabatic Pumping (2004)
Tserkovnyak, Yaroslav, Brataas, Arne
We consider heterostructures consisting of regions with a continuous symmetry in contact with regions wherein the symmetry is spontaneously broken. The low-frequency dynamics of the corresponding...
Spin and Charge Pumping by Ferromagnetic-Superconductor Order Parameters (2004)
Brataas, Arne, Tserkovnyak, Yaroslav
We study transport in ferromagnetic-superconductor/normal-metal systems. It is shown that charge and spin currents are pumped from ferromagnetic superconductors into adjacent normal metals by...
Reducing the critical switching current in nanoscale spin valves (2004)
Manschot, Jan, Brataas, Arne, Bauer, Gerrit E. W.
The current induced magnetization reversal in nanoscale spin valves is a potential alternative to magnetic field switching in magnetic memory devices. We show that the critical switching current can...
Dynamic ferromagnetic proximity effect in photoexcited semiconductors (2003)
Bauer, Gerrit E. W., Brataas, Arne, Tserkovnyak, Yaroslav, Halperin, Bertrand I., Zwierzycki, Maciej, Kelly, Paul J.
The spin dynamics of photoexcited carriers in semiconductors in contact with a ferromagnet is treated theoretically and compared with time-dependent Faraday rotation experiments. The long time...
Spin detection in quantum dots by electric currents (2003)
Mishchenko, Eugene G., Brataas, Arne, Tserkovnyak, Yaroslav
We develop a theoretical description of transport through quantum dots connected to reservoirs via spin-polarized ballistic contacts. Rate equations account for spin accumulation inside the dot,...
Non-monotonic angular magnetoresistance in asymmetric spin valves (2003)
Manschot, Jan, Brataas, Arne, Bauer, Gerrit E. W.
The electric resistance of ferromagnet/normal-metal/ferromagnet perpendicular spin valves depends on the relative angle between the magnetization directions. In contrast to common wisdom, this...
Magnetoelectronic Spin Echo (2003)
Brataas, Arne, Zarand, Gergely, Tserkovnyak, Yaroslav, Bauer, Gerrit E. W.
We predict a spin echo in electron transport through layered ferromagnetic-normal-ferromagnetic metal structures: whereas a spin current polarized perpendicular to the magnetization direction decays...
The spin-torque transistor (2003)
Bauer, Gerrit E. W., Brataas, Arne, Tserkovnyak, Yaroslav, Van Wees, Bart J.
A magnetoelectronic thin-film transistor is proposed that can display negative differential resistance and gain. The working principle is the modulation of the soure-drain current in a spin valve by...
Bauer, Gerrit E. W., Tserkovnyak, Yaroslav, Huertas-Hernando, Daniel, Brataas, Arne
Magnetoelectronics is mainly digital, i.e. governed by up and down magnetizations. In contrast, analogue magnetoelectronics makes use of phenomena occuring for non-collinear magnetization...
Dynamic exchange coupling and Gilbert damping in magnetic multilayers (2003)
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W.
We theoretically study dynamic properties of thin ferromagnetic films in contact with normal metals. Moving magnetizations cause a flow of spins into adjacent conductors, which relax by spin flip,...
Magnetovibrational coupling in small cantilevers (2003)
Kovalev, Alexey A., Bauer, Gerrit E. W., Brataas, Arne
A nano-magnetomechanical system consisting of a cantilever and a thin magnetic film is predicted to display magnetovibrational modes, which should enable applications for sensors and actuators. The...
Kondo effect and spin filtering in triangular artificial atoms (2003)
Zarand, Gergely, Brataas, Arne, Goldhaber-Gordon, David
We study strongly correlated states in triangular artificial atoms. Symmetry-driven orbital degeneracy of the single particle states can give rise to an SU(4) Kondo state with entangled orbital and...
Dynamic stiffness of spin valves (2002)
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W.
The dynamics of the magnetic order parameters of ferromagnet/normal-metal/ferromagnet spin valves and isolated ferromagnets may be very different. We investigate the role of the nonequilibrium...
Dynamic exchange coupling in magnetic bilayers (2002)
Heinrich, Bret, Tserkovnyak, Yaroslav, Woltersdorf, Georg, Brataas, Arne, Urban, Radovan, Bauer, Gerrit E. W.
A long-ranged dynamic interaction between ferromagnetic films separated by normal-metal spacers is reported, which is communicated by nonequilibrium spin currents. It is measured by ferromagnetic...
Spin pumping and magnetization dynamics in metallic multilayers (2002)
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W.
We study the magnetization dynamics in thin ferromagnetic films and small ferromagnetic particles in contact with paramagnetic conductors. A moving magnetization vector causes \textquotedblleft...
Spin-transfer in diffusive ferromagnet-normal metal systems with spin-flip scattering (2002)
Kovalev, Alexey, Brataas, Arne, Bauer, Gerrit E. W.
The spin-transfer in biased disordered ferromagnet (F) - normal metal (N) systems is calculated by the diffusion equation. For F1-N2-F2 and N1-F1-N2-F2-N3 spin valves, the effect of spin-flip...
Universal angular magnetoresistance and spin torque in ferromagnetic/normal metal hybrids (2002)
Bauer, Gerrit E. W., Tserkovnyak, Yaroslav, Huertas-Hernando, Daniel, Brataas, Arne
The electrical resistance of ferromagnetic/normal-metal (F/N) heterostructures depends on the nature of the junctions which may be tunnel barriers, point contacts, or intermetallic interfaces. For...
Spin battery operated by ferromagnetic resonance (2002)
Brataas, Arne, Tserkovnyak, Yaroslav, Bauer, Gerrit E. W., Halperin, Bertrand I.
Precessing ferromagnets are predicted to inject a spin current into adjacent conductors via Ohmic contacts, irrespective of a conductance mismatch with, for example, doped semiconductors. This opens...
Enhanced Gilbert Damping in Thin Ferromagnetic Films (2001)
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W.
Using a scattering matrix approach, the precession of the magnetization of a ferromagnet is shown to transfer spins into adjacent normal metal layers. This ``pumping'' of spins slows down the...
Tserkovnyak, Yaroslav, Brataas, Arne
We calculate the current and the spin-torque in small symmetric double tunnel barrier ferromagnet - superconductor - ferromagnet (F-S-F) systems. Spin-accumulation on the superconductor governs the...
Shot noise in ferromagnet--normal metal systems (2001)
Tserkovnyak, Yaroslav, Brataas, Arne
A semiclassical theory of the low frequency shot noise in ferromagnet - normal metal systems is formulated. Non-collinear magnetization directions of the ferromagnetic leads, arbitrary junctions and...
Bauer, Gerrit E. W., Nazarov, Yuli V., Brataas, Arne
The recently developed semiclassical theory for magnetoelectronic circuits is applied to a transistor-like device consisting of a normal metal island and three magnetic terminals. The electric...
Semiclassical Concepts in Magnetoelectronics (2000)
Bauer, Gerrit E. W., Nazarov, Yuli V., Huertas-Hernando, Daniel, Brataas, Arne, Xia, Ke, Kelly, Paul J.
Semiclassical theories of electron and spin transport in metallic magnetic structures are reviewed with emphasis on the role of disorder and electronic band structures in the current perpendicular to...
Brataas, Arne, Nazarov, Yu. V., Bauer, G. E. W.
A theory of spin-transport in hybrid normal metal - ferromagnetic electronic circuits is developed, taking into account non-collinear spin-accumulation. Spin-transport through resistive elements is...
The current through ferromagnetic single-electron transistors (SET's) is considered. Using path integrals the linear response conductance is formulated as a function of the tunnel conductance vs....
Huertas-Hernando, Daniel, Nazarov, Yu. V., Brataas, Arne, Bauer, Gerrit E. W.
We study diffusive transport through ferromagnet - normal metal - ferromagnet (F-N-F) systems, with arbitrary but fixed magnetization directions of the ferromagnetic reservoirs and orientations of a...
Negative Domain Wall Resistance in Ferromagnets (1999)
Van Gorkom, R. P., Brataas, Arne, Bauer, Gerrit E. W.
The electrical resistance of a diffusive ferromagnet with magnetic domain walls is studied theoretically, taking into account the spatial dependence of the magnetization. The semiclassical domain...
Scattering theory of the Johnson spin transistor (1999)
Geux, Linda S., Brataas, Arne, Bauer, Gerrit E. W.
We discuss a simple, semiclassical scattering theory for spin-dependent transport in a many-terminal formulation, with special attention to the four terminal device of Johnson referred to as spin...
Finite-element theory of transport in ferromagnet-normal metal systems (1999)
Brataas, Arne, Nazarov, Yu. V., Bauer, Gerrit E. W.
We formulate a theory of spin dependent transport of an electronic circuit involving ferromagnetic elements with non-collinear magnetizations which is based on the conservation of spin and charge...
Ballistic and diffuse transport through a ferromagnetic domain wall (1999)
Brataas, Arne, Tatara, Gen, Bauer, Gerrit E. W.
We study transport through ballistic and diffuse ferromagnetic domain walls in a two-band Stoner model with a rotating magnetization direction. For a ballistic domain wall, the change in the...
Non-equilibrium spin accumulation in ferromagnetic single-electron transistors (1998)
Brataas, Arne, Nazarov, Yu. V., Inoue, J., Bauer, G. E. W.
We study transport in ferromagnetic single-electron transistors. The non- equilibrium spin accumulation on the island caused by a finite current through the system is described by a generalized...
Spin-accumulation in small ferromagnetic double barrier junctions (1998)
Brataas, Arne, Nazarov, Yu. V., Inoue, J., Bauer, Gerrit E. W.
The non-equilibrium spin accumulation in ferromagnetic double barrier junctions is shown to govern the transport in small structures. Transport properties of such systems are described by a...
Ballistic electron transport through magnetic domain walls (1998)
Schep, Kees M., Brataas, Arne, Bauer, Gerrit E. W., Kelly, Paul J.
Electron transport limited by the rotating exchange-potential of domain walls is calculated in the ballistic limit for the itinerant ferromagnets Fe, Co, and Ni. When realistic band structures are...
Brataas, Arne, Zhang, C., Chao, K. A.
We study light scattering from a periodically modulated two dimensional electron gas in a perpendicular magnetic field. If a subband is partially filled, the imaginary part of the dielectric function...
Spin-density and charge-density excitations in quantum wires (1997)
Brataas, Arne, Mal'hukov, A. G., Steinebach, Christoph, Gudmundsson, Vidar, Chao, K. A.
We study an interacting electron gas in a quantum wire within the Hartree-Fock random phase approximation. Vertex corrections to the electron spin polarizability due to the electronic exchange...