Nanowire spin torque oscillator driven by spin orbit torques

Duan, Zheng; Smith, Andrew J.; Liu, Yang; Youngblood, Brian; Lindner, J.; Demidov, V. E.; Demokritov, S. O.

doi:10.1038/ncomms6616

Cited by 204 publications

(234 citation statements)

References 51 publications

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“…The relatively high spin-mixing conductance combined with very low Gilbert damping (comparable with the best reported values of other metallic ferromagnets) make Pt/LSMO an attractive system for spintronic applications such as spin Hall memories 7 and oscillators. 10,[46][47][48][49] Lastly, these results indicate that LSMO is a promising perovskite building block for all-oxide multifuncitonal high-frequency spintronics devices.…”

Section: -5mentioning

confidence: 85%

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

et al. 2016

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We report ferromagnetic resonance measurements of magnetic anisotropy and damping in epitaxial La0.7Sr0.3MnO3 (LSMO) and Pt capped LSMO thin films on SrTiO3 (001) substrates. The measurements reveal large negative perpendicular magnetic anisotropy and a weaker uniaxial in-plane anisotropy that are unaffected by the Pt cap. The Gilbert damping of the bare LSMO films is found to be low α = 1.9(1) × 10−3, and two-magnon scattering is determined to be significant and strongly anisotropic. The Pt cap increases the damping by 50% due to spin pumping, which is also directly detected via inverse spin Hall effect in Pt. Our work demonstrates efficient spin transport across the Pt/LSMO interface.

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Section: -5mentioning

confidence: 85%

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

et al. 2016

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“…However, the physical origin of this spin current tensor is different since here, it is obtained specifically for the case of a spin current induced by a thermal gradient. Very recently, self-oscillation based on spin-orbit torque was found in YIG/Pt pillars [29] and in permalloy/Pt nanowires [30]. By analogy, we may expect self-oscillation driven by a thermal spin torque as well.…”

mentioning

confidence: 94%

“…Very recently, self-oscillation based on spin-orbit torque was found in YIG/Pt pillars [29] and in permalloy/Pt nanowires [30]. By analogy, we may expect self-oscillation driven by a thermal spin torque as well.…”

mentioning

confidence: 94%

Thermal spin torques in magnetic insulators

Brechet

Che

et al. 2017

Phys. Rev. B

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The damping of spin waves transmitted through a two-port magnonic device implemented on a yttrium iron garnet thin film is shown to be proportional to the temperature gradient imposed on the device. The sign of the damping depends on the relative orientation of the magnetic field, the wave vector, and the temperature gradient. The observations are accounted for qualitatively and quantitatively by using an extension of the variational principle that leads to the Landau-Lifshitz equation. All parameters of the model can be obtained by independent measurements. DOI: 10.1103/PhysRevB.95.104432 The discovery of giant magnetoresistance (GMR) revolutionized information storage technology [1,2] and the spin-transfer torque (STT), predicted two decades ago by Slonczewski [3] and Berger [4], may reshape once again the magnetic memory industry [5]. The concept of a heat-driven spin torque, or thermal spin-transfer torque (TST), has been suggested [6][7][8] and opened the world of spin caloritronics. Magnetic insulators are ideal for studying the fundamentals of spin caloritronics, because they are free of the effect of heat on charge transport. Here, we demonstrate that a spin torque can be induced in magnetic insulators by applying a thermal gradient. The effect is not linked to spin-dependent transport at interfaces since we observe a heat-driven contribution to damping of magnetization waves on a millimeter scale. We show that by adding to M(r) the bound magnetic current (∇ × M) as state variable, the variational principle that yields the Landau-Lifshitz equation predicts the presence of a thermal spin torque, from which we derive an expression for spin currents in insulators. Our experiments verify the key predictions of this model. Thermodynamics can predict a link between heat and magnetization, but cannot determine the strength of the effect [9].Spin caloritronics studies the interplay of spin, charge, and heat transport [10]. As the spin dependence of the electrical conductivity proved to be important since it gives rise to GMR, the spin dependence of other transport parameters has been investigated, such as that of the Seebeck [11] and Peltier coefficients [12]. The combination of heat with spin and charge transport gained widespread attention owing to studies of the spin Seebeck effect [13,14]. The STT effect which uses a spinpolarized electrical current has shown promising applications, e.g., in magnetic memories (STT-MRAM). It was already established that heat flowing through a ferromagnetic metal can generate a diffusive spin current [15] which induces a spin torque when flowing through a magnetic nanostructure [6]. Experimentally, this effect was studied in Co/Cu/Co spin valve nanowires by observing the change in the switching * haiming.yu@buaa.edu.cn † jean-philippe.ansermet@epfl.ch field of magnetization due to a local thermal gradient [7]. It was later shown that heat couples to magnetization dynamics [16][17][18]. The effect of heat on magnetization was also found in magnetic tunnel junctions [19] and...

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“…Studies of these effects such as fieldand current-induced domain wall motion [1][2][3][4][5][6][7] , domain wall magneto-resistance [8][9][10] and the interaction of spin waves with nanoscale spin textures such as domain walls, vortices and skyrmions [11][12][13][14][15][16][17] heavily rely on the understanding of transport and magnetization dynamics in ferromagnetic nanowires. More recently, ferromagnetic nanowires proved to be useful for studies of inverse spin Hall effect 19 and spin orbit torques [20][21][22][23] . Furthermore, several realizations of spintronic logic gates [27][28][29][30][31][32] and spin wave guides 33 based on ferromagnetic nanowires have been recently proposed.…”

Section: Introductionmentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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We report experimental and theoretical studies of spin wave eigenmodes in transversely magnetized thin film Permalloy wires. Using broadband ferromagnetic resonance technique, we measure the spectrum of spin wave eigenmodes in individual wires as a function of magnetic field and wire width. Comparison of the experimental data to our analytical model and micromagnetic simulations shows that the intrinsic dipolar edge pinning of spin waves is negligible in transversely magnetized wires. Our data also quantify the degree of extrinsic edge pinning in Permalloy wires. This work establishes the boundary conditions for dynamic magnetization in transversely magnetized thin film wires for the range of wire widths and thicknesses studied, and provides a quantitative description of the spin wave eigenmode frequencies and spatial profiles in this system as a function of the wire width.

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Nanowire spin torque oscillator driven by spin orbit torques

Cited by 204 publications

References 51 publications

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers

Thermal spin torques in magnetic insulators

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

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