Spin pumping in YIG/Pt bilayers as a function of layer thickness

Haertinger, M.; Back, Christian; Lotze, Johannes; Weiler, Mathias; Geprägs, Stephan; Huebl, Hans; Goennenwein, Sebastian T. B.; Woltersdorf, Georg

doi:10.1103/physrevb.92.054437

Cited by 82 publications

(48 citation statements)

References 39 publications

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“…We attribute the secondary mode to regions in the film with slightly different M s or magnetic anisotropy. More pronounced inhomogeneity-induced secondary FMR modes have been observed in epitaxial magnetic films in prior reports 22,44 .…”

Section: Sample and Experimental Detailsmentioning

confidence: 71%

Spin transport and dynamics in all-oxide perovskite La2/3Sr1/3MnO3/SrRuO3

et al. 2016

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Thin films of perovskite oxides offer the possibility of combining emerging concepts of strongly correlated electron phenomena and spin current in magnetic devices. However, spin transport and magnetization dynamics in these complex oxide materials are not well understood. Here, we experimentally quantify spin transport parameters and magnetization damping in epitaxial perovskite ferromagnet/paramagnet bilayers of La 2/3 Sr 1/3 MnO3/SrRuO3 (LSMO/SRO) by broadband ferromagnetic resonance spectroscopy. From the SRO thickness dependence of Gilbert damping, we estimate a short spin diffusion length of < ∼ 1 nm in SRO and an interfacial spin-mixing conductance comparable to other ferromagnet/paramagnetic-metal bilayers. Moreover, we find that anisotropic non-Gilbert damping due to two-magnon scattering also increases with the addition of SRO. Our results demonstrate LSMO/SRO as a spin-source/spin-sink system that may be a foundation for examining spin-current transport in various perovskite heterostructures.

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Section: Sample and Experimental Detailsmentioning

confidence: 71%

Spin transport and dynamics in all-oxide perovskite La2/3Sr1/3MnO3/SrRuO3

et al. 2016

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“…It is interesting to ask how the Gd-layer may affect results: an obvious effect could be line broadening in FMR experiments - these can be due to two-magnon scattering 25 but might also be due to inhomogeneities in the sample 26 . It may be that the Gd appears as impurities that could be seen, for example, in low temperature increases in the FMR linewidth 27,28 as was recently evoked as an explanation for low temperature damping 29 .…”

Section: Discussionmentioning

confidence: 99%

Interfacial Origin of the Magnetisation Suppression of Thin Film Yttrium Iron Garnet

Mitra

Céspedes

Ramasse

et al. 2017

Sci Rep

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Yttrium iron garnet has a very high Verdet constant, is transparent in the infrared and is an insulating ferrimagnet leading to its use in optical and magneto-optical applications. Its high Q-factor has been exploited to make resonators and filters in microwave devices, but it also has the lowest magnetic damping of any known material. In this article we describe the structural and magnetic properties of single crystal thin-film YIG where the temperature dependence of the magnetisation reveals a decrease in the low temperature region. In order to understand this complex material we bring a large number of structural and magnetic techniques to bear on the same samples. Through a comprehensive analysis we show that at the substrate -YIG interface, an interdiffusion zone of only 4–6 nm exists. Due to the interdiffusion of Y from the YIG and Gd from the substrate, an addition magnetic layer is formed at the interface whose properties are crucially important in samples with a thickness of YIG less than 200 nm.

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“…These properties are at 10 K. The transverse spin conductance g ⊥ is of the same order of magnitude as that of a ferromagnetic or ferrimagnetic material [20]. We therefore estimate this to be g ⊥ /A = 3 × 10 18 m −2 [36,37]. Experimental measurements of g ⊥ are needed and are further motivated by the present calculations.…”

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confidence: 95%

Spin pumping and inverse spin Hall voltages from dynamical antiferromagnets

Johansen

Brataas

2017

Phys. Rev. B

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Dynamical antiferromagnets can pump spins into adjacent conductors. The high antiferromagnetic resonance frequencies represent a challenge for experimental detection, but magnetic fields can reduce these resonance frequencies. We compute the ac and dc inverse spin Hall voltages resulting from dynamical spin excitations as a function of a magnetic field along the easy axis and the polarization of the driving ac magnetic field perpendicular to the easy axis. We consider the insulating antiferromagnets MnF 2 , FeF 2 , and NiO. Near the spin-flop transition, there is a significant enhancement of the dc spin pumping and inverse spin Hall voltage for the uniaxial antiferromagnets MnF 2 and FeF 2 . In the uniaxial antiferromagnets it is also found that the ac spin pumping is independent of the external magnetic field when the driving field has the optimal circular polarization. In the biaxial NiO, the voltages are much weaker, and there is no spin-flop enhancement of the dc component. DOI: 10.1103/PhysRevB.95.220408 Spin pumping is a versatile tool for probing spin dynamics in ferromagnets [1][2][3][4][5][6]. The magnitude of the pumped spin currents reveals information about the magnetization dynamics and the electron-magnon coupling at interfaces [7][8][9]. The precessing spins generate a pure spin flow into adjacent conductors. Inside the conductor, the resulting spin accumulation and currents give insight into the spin-orbit coupling. The inverse spin Hall effect (ISHE) is often used to convert the pure spin current into a charge current, which is detected [10,11]. Additionally, the induced nonequilibrium spins can be probed with x-ray magnetic circular dichroism measurements [12,13].Antiferromagnets differ strikingly from ferromagnets [14]. There are no stray fields in antiferromagnets, making them more robust against the influence of external magnetic fields. The recent discovery of anisotropic magnetoresistance [15][16][17], spin-orbit torques [18], and electrical switching of an antiferromagnet [19] demonstrate the feasibility of antiferromagnets as active spintronics components.The real benefit of antiferromagnets is that they can enable terahertz circuits. Unlike ferromagnets, the resonance frequency of antiferromagnets is also governed by the tremendous exchange energy. We recently demonstrated that the transverse spin conductance, a governing factor of spin pumping, is as large in antiferromagnet-normal metal junctions (AF|N) as in ferromagnet-normal metal junctions [20]. Furthermore, this result is valid even when the magnetic system is insulating. The firm electron-magnon coupling at the interface opens the door for electrical probing of the ultrafast spin dynamics in antiferromagnets [20,21].Precessing spins in antiferromagnets generate terahertz currents in adjacent conductors. This ability opens new territory in high-frequency spintronics. Such studies could become influential in gathering vital insight into fast electron dynamics and eventually for a broad range of applications. These electric sign...

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Spin pumping in YIG/Pt bilayers as a function of layer thickness

Cited by 82 publications

References 39 publications

Spin transport and dynamics in all-oxide perovskite La2/3Sr1/3MnO3/SrRuO3

Spin transport and dynamics in all-oxide perovskite La2/3Sr1/3MnO3/SrRuO3

Interfacial Origin of the Magnetisation Suppression of Thin Film Yttrium Iron Garnet

Spin pumping and inverse spin Hall voltages from dynamical antiferromagnets

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