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Starikov, A.A. (author), Kelly, P.J. (author), Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)Using a formulation of first-principles scattering theory that includes disorder and spin-orbit coupling on an equal footing, we calculate the resistivity ?, spin-flip diffusion length lsf, and Gilbert damping parameter ? for Ni1-xFex substitutional alloys as a function of x. For the technologically important Ni80Fe20 alloy, Permalloy, we...journal article 2010
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Mosendz, O. (author), Vlaminck, V. (author), Pearson, J.E. (author), Fradin, F.Y. (author), Bauer, G.E.W. (author), Bader, S.D. (author), Hoffmann, A. (author)Spin pumping is a mechanism that generates spin currents from ferromagnetic resonance over macroscopic interfacial areas, thereby enabling sensitive detection of the inverse spin Hall effect that transforms spin into charge currents in nonmagnetic conductors. Here we study the spin-pumping-induced voltages due to the inverse spin Hall effect in...journal article 2010
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Xiao, J. (author), Bauer, G.E.W. (author), Uchida, K. (author), Saitoh, E. (author), Maekawa, S. (author)The spin Seebeck effect is a spin-motive force generated by a temperature gradient in a ferromagnet that can be detected via normal metal contacts through the inverse spin Hall effect [K. Uchida et al., Nature (London) 455, 778 (2008)]. We explain this effect by spin pumping at the contact that is proportional to the spin-mixing conductance of...journal article 2010
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Heikkilä, T.T. (author), Hatami, M. (author), Bauer, G.E.W. (author)We study the concept of spin heat accumulation in excited spin valves, more precisely the effective electron temperature that may become spin dependent, both in linear response and far from equilibrium. A temperature or voltage gradient create nonequilibrium energy distributions of the two spin ensembles in the normal-metal spacer, which...journal article 2010
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Rippard, W.H. (author), Deac, A.M. (author), Pufall, M.R. (author), Shaw, J.M. (author), Keller, M.W. (author), Russek, S.E. (author), Bauer, G.E.W. (author), Serpico, C. (author)We have measured spin-transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. The frequencies and powers of the excitations agree well with the predictions of the single-domain model and indicate that the excited dynamics correspond to...journal article 2010
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Bauer, G.E.W. (author), Bretzel, S. (author), Brataas, A. (author), Tserkovnyak, Y. (author)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 field. An expression for heat-current-induced domain-wall motion is derived. Application of Onsager’s reciprocity relation leads to a unified...journal article 2010
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Mosendz, O. (author), Pearson, J.E. (author), Fradin, F.Y. (author), Bauer, G.E.W. (author), Bader, S.D. (author), Hoffmann, A. (author)Spin Hall effects intermix spin and charge currents even in nonmagnetic materials and, therefore, ultimately may allow the use of spin transport without the need for ferromagnets. We show how spin Hall effects can be quantified by integrating Ni80Fe20|normal metal (N) bilayers into a coplanar waveguide. A dc spin current in N can be generated by...journal article 2010
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Bretzel, S. (author), Bauer, G.E.W. (author), Tserkovnyak, Y. (author), Brataas, A. (author)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 Landau–Lifshitz–Gilbert equation. The conditions for an experimental observation of the Barnett effect in different materials and sample geometries are...journal article 2009
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Foros, J. (author), Brataas, A. (author), Bauer, G.E.W. (author), Tserkovnyak, Y. (author)The interplay between current and magnetization fluctuations and dissipation in layered-ferromagnetic-normal-metal nanostructures is investigated. We use scattering theory and magnetoelectronic circuit theory to calculate charge and spin-current fluctuations. Via the spin-transfer torque, spin-current noise causes a significant enhancement of...journal article 2009
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Hatami, M. (author), Bauer, G.E.W. (author), Zhang, Q. (author), Kelly, P.J. (author)We model and evaluate the Peltier and Seebeck effects in magnetic multilayer nanostructures by a finite-element theory of thermoelectric properties. We present analytical expressions for the thermopower and the current-induced temperature changes due to Peltier cooling/heating. The thermopower of a magnetic element is in general spin polarized,...journal article 2009
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Xiao, J. (author), Bauer, G.E.W. (author), Maekawa, S. (author), Brataas, A. (author)Spin pumping by a moving magnetization gives rise to an electric voltage over a spin valve. Thermal fluctuations of the magnetization manifest themselves as increased thermal voltage noise with absorption lines at the ferromagnetic resonance frequency and/or zero frequency. The effect depends on the magnetization configuration and can be of the...journal article 2009
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Saarikoski, H. (author), Bauer, G.E.W. (author)Spin accumulation is a crucial but imprecise concept in spintronics. In metal-based spintronics it is characterized in terms of semiclassical distribution functions. In semiconductors with a strong spin-orbit coupling the spin accumulation is interpreted as a superposition of coherent eigenstates. Both views can be reconciled by taking into...journal article 2009
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Foros, J. (author), Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)In the presence of spatial variation in the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order parameter. By the fluctuationdissipation theorem, the fluctuations at thermal equilibrium are related to the viscous magnetization damping, which in...journal article 2008
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Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)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 fields and Gilbert damping tensor in terms of the scattering matrix. Dissipation of magnetic energy equals energy current pumped out of the system by...journal article 2008
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Kovalev, A.A. (author), Zârbo, L.P. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author), Sinova, J. (author)Torsional oscillations of a freestanding semiconductor beam are shown to cause spin-dependent oscillating potentials that spin polarize an applied charge current in the presence of intentional or disorder scattering potentials. We propose several realizations of mechanical spin generators and manipulators based on this piezospintronic effect.journal article 2008
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Xiao, J. (author), Bauer, G.E.W. (author), Brataas, A. (author)We study the bias-dependent spin-transfer torque in magnetic tunnel junctions in the Stoner model by scattering theory. We show that the in-plane (Slonczewski type) torque vanishes and subsequently reverses its direction when the bias voltage becomes larger or the barrier wider than material and device-dependent critical values. We are able to...journal article 2008
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Xiao, J. (author), Bauer, G.E.W. (author), Brataas, A. (author)We study theoretically the charge transport pumped by magnetization dynamics through epitaxial FIF and FNIF magnetic tunnel junctions (F, ferromagnet; I, insulator; N, normal metal). We predict a small but measurable dc pumping voltage under ferromagnetic resonance conditions for collinear magnetization configurations, which may change sign as a...journal article 2008
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- Skadsem, H.J. (author), Tserkovnyak, Y. (author), Arne Brataas, A. (author), Bauer, G.E.W. (author) journal article 2007
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- Kovalev, A.A. (author), Bauer, G.E.W. (author), Brataas, A. (author) journal article 2007
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- Foros, J. (author), Brataas, A. (author), Bauer, G.E.W. (author), Tserkovnyak, Y. (author) journal article 2007