Current-Induced Spin-Wave Doppler Shift

Vlaminck, Vincent; Bailleul, Matthieu

doi:10.1126/science.1162843

Cited by 313 publications

(285 citation statements)

References 69 publications

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“…While the magnetization of the spin-pumping setups mentioned above is homogeneous, the situation is even more interesting in the presence of magnetic textures/spin waves when complex spin-charge and magnetization dynamics takes place [34][35][36][37]. Hence, we will consider the general situation where the driving is due to a time-dependent magnetic texture, whose spatial and temporal profile can have any form, and only needs to be smooth on the Fermi wavelength and energy scales.…”

Section: Introductionmentioning

confidence: 99%

Spin-charge coupled dynamics driven by a time-dependent magnetization

2017

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The spin-charge coupled dynamics in a thin, magnetized metallic system are investigated. The effective driving force acting on the charge carriers is generated by a dynamical magnetic texture, which can be induced, e.g., by a magnetic material in contact with a normal-metal system. We consider a general inversion-asymmetric substrate/normal-metal/magnet structure, which, by specifying the precise nature of each layer, can mimic various experimentally employed setups. Inversion symmetry breaking gives rise to an effective Rashba spinorbit interaction. We derive general spin-charge kinetic equations which show that such spin-orbit interaction, together with anisotropic Elliott-Yafet spin relaxation, yields significant corrections to the magnetization-induced dynamics. In particular, we present a consistent treatment of the spin density and spin current contributions to the equations of motion, inter alia, identifying a term in the effective force which appears due to a spin current polarized parallel to the magnetization. This "inverse-spin-filter" contribution depends markedly on the parameter which describes the anisotropy in spin relaxation. To further highlight the physical meaning of the different contributions, the spin-pumping configuration of typical experimental setups is analyzed in detail. In the two-dimensional limit the buildup of dc voltage is dominated by the spin-galvanic (inverse Edelstein) effect. A measuring scheme that could isolate this contribution is discussed.

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Section: Introductionmentioning

confidence: 99%

Spin-charge coupled dynamics driven by a time-dependent magnetization

2017

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“…From the measured resistance R NLSV ( ), we see that a relatively large 9 m spin-valve signal is present on top of a 1.05 background, which is only slightly different to the 7.8 m and 640 m calculated signals with the metallic spin parameters λ Cu = 350 nm, λ Py = 5 nm and P Py = 0.25 obtained from previously fabricated samples 6,15 . Here P Py is positive, as shown before 27 .The observed thermal-spin-injection signal R 2 s = −15.6 nV mA −2 is determined from Fig. 4b.…”

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confidence: 99%

Thermally driven spin injection from a ferromagnet into a non-magnetic metal

et al. 2010

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Thermally driven spin injection from a ferromagnet into a non-magnetic metal Slachter, A.; Bakker, F. L.; Adam, J-P.; van Wees, B. J.Published in: Nature Physics DOI: 10.1038/NPHYS1767IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Document VersionPublisher's PDF, also known as Version of record Publication date: 2010Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Slachter, A., Bakker, F. L., Adam, J-P., & van Wees, B. J. (2010). Thermally driven spin injection from a ferromagnet into a non-magnetic metal. Nature Physics, 6(11), 879-882. https://doi.org/10.1038/NPHYS1767 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. van WeesCreation, manipulation and detection of spin-polarized carriers are the key elements of spin-based electronics 1,2 . Most practical devices 3-5 use a perpendicular geometry in which the spin currents are accompanied by charge currents. In recent years, new sources of pure spin currents (that is, transport of spin angular momentum without charge currents) have been demonstrated 6-9 and applied 10-12 . Here we demonstrate a conceptually new source of pure spin current driven by the flow of heat across the interface between a ferromagnet and a non-magnetic metal. This spin current is generated because, in a ferromagnet, the Seebeck effect-which describes the generation of a voltage as a result of a temperature gradient-is spin dependent 13,14 . We studied this new source of spin currents experimentally in a non-local lateral geometry and developed a three-dimensional model that describes the heat, charge and spin transport in this geometry, enabling us to quantify this process 15 . We obtain a spin-dependent Seebeck coefficient for Permalloy of −3.8 µV K −1 , suggesting that thermally driven spin injection is a feasible alternative for electrical spin injection in, for example, spin-transfer-torque experiments 16 .The interplay of spin-dependent conductivity and thermoelectricity has been known since half a century ago, when it was used to describe the conventional Seebeck effect of ferromagnetic metals 17 . The discovery of the giant magnetoresistance effect 3 sparked the interest of the community in spin-dependent conductivity and new spin electronics that still exists today 4,5,8,18 . Owing to experimental difficulties in controlling heat flows it was only very recently that thermoelectric spintronics was investigated 19,20 , leading to the new field of spin caloritronics 13 . A relevant example is given in ref. 9, which interpret...

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“…The experimental results shown in the following are done with a magnetic field applied perpendicular to the film plane. We note that the droplet states can be affected by Joule heating [7], especially the FL precession [27,28]. We, thus, obtain our data by always keeping the electrical current constant and sweeping the magnetic fields.…”

Section: Experiments Detailsmentioning

confidence: 99%

Effect of Temperature on Magnetic Solitons Induced by Spin-Transfer Torque

et al. 2017

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Citation: LENDINEZ, S. ... et al, 2017. Effect of temperature on magnetic solitons induced by spin-transfer torque. Physical Review Applied, 7 (5), 054027.Additional Information:• This paper was accepted for publication in the jour- Spin-transfer torques in a nanocontact to an extended magnetic film can create spin waves that condense to form dissipative droplet solitons. Here we report an experimental study of the temperature dependence of the current and applied field thresholds for droplet soliton formation, as well as the nanocontact's electrical characteristics associated with droplet dynamics. Nucleation requires lower current densities at lower temperatures, in contrast to typical spin-transfer-torque-induced switching between static magnetic states. Magnetoresistance and electrical noise measurements (10 MHz-1 GHz) show that droplet solitons become more stable at lower temperature. These results are of fundamental interest in understanding the influence of thermal noise on droplet solitons and have implications for the design of devices using the spin-transfertorque effects to create and control collective spin excitations.

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Current-Induced Spin-Wave Doppler Shift

Cited by 313 publications

References 69 publications

Spin-charge coupled dynamics driven by a time-dependent magnetization

Spin-charge coupled dynamics driven by a time-dependent magnetization

Thermally driven spin injection from a ferromagnet into a non-magnetic metal

Effect of Temperature on Magnetic Solitons Induced by Spin-Transfer Torque

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