Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces

Rojas-Sánchez, J.-C.; Reyren, Nicolas; Laczkowski, P.; Savero, Williams; Attané, J. P.; Deranlot, C.; Jamet, M.; George, Jean-Marie; Vila, Laurent; Jaffrès, H.

doi:10.1103/physrevlett.112.106602

Cited by 585 publications

(587 citation statements)

References 52 publications

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“…In addition, it has relatively poor spin scattering efficiency due to relatively long spin diffusion length of 10 nm [31] as compared to Pt (3.5 to 10 nm) [19,20]. This is corroborated by the increase in the value of the inhomogeneous broadening H 0 .…”

Section: …(4)supporting

confidence: 56%

“…A non-linear behaviour is also observed for sample S1 ( scattering [12,14,20]. Since we kept the thickness constant for the Co layer and other NM layers, we may assume that d-d electrons hybridization and two-magnon scattering will be similar contribution in all layers.…”

Section: …(4)mentioning

confidence: 92%

“…In addition, it affects the damping properties critically by various seed and capping layers. Recently, research has been focussed to understand the effect of heavy metal as seed and capping layers [17][18][19][20][21][22]. In a recent report Tokac et al [21] have shown that the effective spin conductance mixing strongly depends on the interfaces of seed (Ta/Cu) and capping (Cu or Ir) layers.…”

Section: Introductionmentioning

confidence: 99%

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Study of spin pumping in Co thin film vis-à-vis seed and capping layers using ferromagnetic resonance spectroscopy

Singh

Jena

2017

J. Phys. D: Appl. Phys.

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Abstract:We investigated the dependence of the seed (Ta/Pt, Ta/Au) and capping (Pt/Ta, Au/Ta) layers on spin pumping effect in the ferromagnetic 3 nm thick Co thin film using ferromagnetic resonance spectroscopy. The data is fitted with Kittel's equation to evaluate damping constant and g-factor. A strong dependence of seed and capping layers on spin pumping has been discussed. The value of damping constant (α) is found to be relatively large i.e. 0.0326±0.0008 for the Ta(3)/Pt(3)/Co(3)/Pt(3)/Ta(3) (nm) multilayer structure, while it is 0.0104±0.0003 for Ta(3)/Co(3)/Ta(3) (nm). Increase in α is observed due to Pt layer that works as a good sink for spins due to high spin orbit coupling. In addition, we measured the effective spin conductance  g = 2.00 ± 0.08 × 10 18 m -2 for the tri-layer structure Pt(3)/Co(3)/Pt(3) (nm) as a result of the enhancement in α relative to its bulk value.We observed that the evaluated g-factor decreases as effective demagnetizing magnetic field increases in all the studied samples. The azimuthal dependence of magnetic resonance field and line width showed relatively high anisotropy in the tri-layer Ta(3)/Co(3)/Ta(3) (nm) structure.

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Section: …(4)supporting

confidence: 56%

Section: …(4)mentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Study of spin pumping in Co thin film vis-à-vis seed and capping layers using ferromagnetic resonance spectroscopy

Singh

Jena

2017

J. Phys. D: Appl. Phys.

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“…Another possible reason for the low G r value could be the Ar-ion milling performed before the Cu deposition [12] or the YIG surface quality. We rule this out by performing a control experiment in Pt/YIG where we obtain G r = 3.34 × 10 13 −1 m −2 from SMR measurements [37,44,45]. Particularities of the grain structure and the growth condition of the evaporated Cu on YIG could also lead to an effective reduction of G r at the interface.…”

mentioning

confidence: 99%

Modulation of pure spin currents with a ferromagnetic insulator

et al. 2015

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We propose and demonstrate spin manipulation by magnetically controlled modulation of pure spin currents in cobalt/copper lateral spin valves, fabricated on top of the magnetic insulator Y 3 Fe 5 O 12 (YIG). The direction of the YIG magnetization can be controlled by a small magnetic field. We observe a clear modulation of the nonlocal resistance as a function of the orientation of the YIG magnetization with respect to the polarization of the spin current. Such a modulation can only be explained by assuming a finite spin-mixing conductance at the Cu/YIG interface, as it follows from the solution of the spin-diffusion equation Spintronics is a rapidly growing field that aims at using and manipulating not only the charge, but also the spin of the electron, which could lead to faster data processing, nonvolatility, and lower electrical power consumption as compared to conventional electronics [1]. Sophisticated applications such as hard-disk read heads and magnetic random access memory (MRAM) have been introduced in the last two decades.Further progress could be achieved with pure spin currents, which are an essential ingredient in an envisioned spin-only circuit that would integrate logics and memory [2]. The most basic unit in such a concept is the spin analog to the transistor, in which the manipulation of pure spin currents is crucial. The original proposal by Datta and Das [3], which is also applicable to pure spin currents [4], suggested a spin manipulation that would arise from the spin precession due to the spin-orbit interaction modulated by an electric field (Rashba coupling). However, a fundamental limitation appears here, because the best materials for spin transport are those showing the lowest spin-orbit interaction and, therefore, there has been no success in electrically manipulating the spins and propagating them at the same environment, with few exceptions [4].Alternative ways to control pure spin currents are thus desirable. One could take advantage of the spin-mixing conductance concept [5,6] at nonmagnetic metal (NM)/ferromagnetic insulator (FMI) interfaces, which governs the interaction between the spin currents present at the NM and the magnetization of the FMI. This concept is the basis of new spindependent phenomena, including spin pumping [6][7][8][9][10][11][12], spin Seebeck effect [6,13], and spin Hall magnetoresistance (SMR) [6,[14][15][16][17][18]. In these cases, a NM with large spin-orbit coupling is required to convert the involved spin currents into charge currents via the inverse spin Hall effect [19].In this Rapid Communication, we demonstrate an alternative way of modulating pure spin currents based on a magnetic, instead of electric, gating. To that end, we use lateral spin valves (LSVs). These devices allow an electrical injection and detection of pure spin currents in a NM channel by using * f.casanova@nanogune.eu ferromagnetic (FM) electrodes in a nonlocal configuration [20][21][22][23][24][25][26][27][28][29]. The LSVs have been fabricated on top of a FMI, in order to enab...

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“…Mechanisms which might give rise to the SHE [14,15] include the intrinsic SHE [1,16], side-jump scattering [17] and skew scattering [18]. Two common methods to quantify the strength of the SHE are to employ ferromagnet/normal metal (FM/NM) bilayers and either (1) detect the spin transfer torque that the SHE-induced spin current from the NM layer exerts on the magnetization of the adjacent FM layer [19,20], or (2) use spin pumping to inject a spin current from the FM to the NM and detect the electric current in the NM layer that is induced by the inverse SHE (ISHE) [21][22][23]. In the former case due to spin backflow (SBF) at the FM/NM interface [24,25] and/or enhanced spin scattering at the interface (spin memory loss or SML) [26], only a portion NM|FM [19,[27][28][29][30][31], beta-Ta [19] and beta-W [4].…”

mentioning

confidence: 99%

Spin Torque Study of the Spin Hall Conductivity and Spin Diffusion Length in Platinum Thin Films with Varying Resistivity

Nguyen¹,

Ralph²,

Buhrman³

2016

Phys. Rev. Lett.

413

381

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Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces

Cited by 585 publications

References 52 publications

Study of spin pumping in Co thin film vis-à-vis seed and capping layers using ferromagnetic resonance spectroscopy

Study of spin pumping in Co thin film vis-à-vis seed and capping layers using ferromagnetic resonance spectroscopy

Modulation of pure spin currents with a ferromagnetic insulator

Spin Torque Study of the Spin Hall Conductivity and Spin Diffusion Length in Platinum Thin Films with Varying Resistivity

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