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Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)
The magnetization dynamics of ferromagnets is often formulated in terms of the Landau-Lifshitz-Gilbert (LLG) equation. The reactive part of this equation describes the response of the magnetization in terms of effective fields, whereas the dissipative part is parametrized by the Gilbert damping tensor. We formulate a scattering theory for the...
journal article 2011
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Morten, J.P. (author), Brataas, A. (author), Bauer, G.E.W. (author), Belzig, W. (author), Tserkovnyak, Y. (author)
The injection of pure spin current into superconductors by the dynamics of ferromagnetic contact is studied theoretically. Taking into account the suppression of the order parameter at the interfaces (inverse proximity effect) and the energy-dependence of spin-flip scattering, we determine the temperature-dependent ferromagnetic resonance...
journal article 2010
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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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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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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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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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Foros, J. (author), Brataas, A. (author), Bauer, G.E.W. (author), Tserkovnyak, Y. (author)
journal article 2007
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Wang, X. (author), Bauer, G.E.W. (author), Van Wees, B.J. (author), Brataas, A. (author), Tserkovnyak, Y. (author)
A ferromagnet can resonantly absorb rf radiation to sustain a steady precession of the magnetization around an internal or applied magnetic field. We show that, under these ferromagnetic resonance conditions, a dc voltage is generated at a normal-metal electric contact to a ferromagnet with spin-flip scattering. The spin dynamics in the...
journal article 2006
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Tserkovnyak, Y. (author), Skadsem, H.J. (author), Brataas, A. (author), Bauer, G.E.W. (author)
Current-driven magnetization dynamics in ferromagnetic metals is studied in a self-consistent adiabatic local-density approximation in the presence of spin-conserving and spin-dephasing impurity scattering. Based on a quantum kinetic equation, we derive Gilbert damping and spin-transfer torques entering the Landau-Lifshitz equation to linear...
journal article 2006
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Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)
journal article 2006
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Foros, J. (author), Brataas, A. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)
journal article 2005
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Tserkovnyak, Y. (author), Brataas, A. (author), Bauer, G.E.W. (author), Halperin, B.I. (author)
journal article 2005
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Bauer, G.E.W. (author), Tserkovnyak, Y. (author), Brataas, A. (author), Ren, J. (author), Xia, K. (author), Zwierzycki, M. (author), Kelly, P.J. (author)
journal article 2005
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Zwierzycki, M. (author), Tserkovnyak, Y. (author), Kelly, P.J. (author), Brataas, A. (author), Bauer, G.E.W. (author)
journal article 2005
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Bauer, G.E.W. (author), Brataas, A. (author), Tserkovnyak, Y. (author), Halperin, B.I. (author), Zwierzycki, M. (author), Kelly, J.P. (author)
journal article 2004
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Bauer, G.E.W. (author), Brataas, A. (author), Tserkovnyak, Y. (author), Van Wees, B.J. (author)
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 the magnetization of a third electrode, which is rotated by the spin-torque created by a control spin valve. The device can operate at room...
journal article 2003
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Bauer, G.E.W. (author), Tserkovnyak, Y. (author), Huertas-Hernando, D. (author), Brataas, A. (author)
journal article 2003
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Brataas, A. (author), Zaránd, G. (author), Tserkovnyak, Y. (author), Bauer, G.E.W. (author)
journal article 2003
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