Frequency dependence of spin relaxation in periodic systems

Barsukov, I.; Römer, F. M.; Meckenstock, R.; Lenz, K.; Lindner, J.; Krax, S. Hemken to; Banholzer, Anja; Körner, Michael; Grebing, Jochen; Faßbender, J.; Farle, Michael

doi:10.1103/physrevb.84.140410

Cited by 50 publications

(56 citation statements)

References 30 publications

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“…For Py, the peaks in the linewidth were found to disappear when the film was magnetized parallel to the stripe-like defects. 41,42 The absence of the peaks in our linewidth data for magnetization along the [100] axis in Fig. 4(a) suggests that the Pt/LSMO bilayer films develop stripe-like magnetic defects oriented along this axis.…”

Section: -5mentioning

confidence: 88%

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: 88%

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

et al. 2016

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“…[17][18][19][20][21][22] In previous studies, it was already shown that MCs can be used as grating couplers, 23 for magnonic logic, [24][25][26][27] filter 28 and sensor 29 applications, and moreover, as a tool to access important material properties, such as the exchange constant, at high precision. 30 In order to investigate the effect of the internal demagnetizing field H int d on the spin-wave properties, the dynamics of a surface-modulated magnonic crystal (SMMC) [31][32][33] were reconstructed from 'bottom-up' as sketched in Fig. 1.…”

Section: 9-14mentioning

confidence: 99%

Role of internal demagnetizing field for the dynamics of a surface-modulated magnonic crystal

et al. 2017

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Magnonic crystals with locally alternating properties and specific periodicities exhibit interesting effects, such as a multitude of different spin-wave states and large band gaps. This work aims for demonstrating and understanding the key role of local demagnetizing fields in such systems. To achieve this, hybrid structures are investigated consisting of a continuous thin film with a stripe modulation on top favorable due to the adjustability of the magnonic effects with the modulation size. For a direct access to the spin dynamics, a magnonic crystal was reconstructed from 'bottom-up', i.e., the structural shape as well as the internal field landscape of the structure were experimentally obtained on the nanoscale using electron holography. Subsequently, both properties were utilized to perform dynamic response calculations. The simulations yield the frequency-field dependence as well as the angular dependence of spin waves in a magnonic crystal and reveal the governing role of the internal field landscape around the backward-volume geometry. The complex angle-dependent spin-wave behavior is described for a 360• in-plane rotation of an external field by connecting the internal field landscape with the individual spin-wave localization.

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“…However, it is generally a challenge to separate the inverse spin-Hall signal from the spin rectification signal, which is caused by an oscillating magnetoresistance mixing with a microwave current in the conductive magnetic layer [29][30][31] . Moreover, while the spin-mixing conductance is typically estimated from the enhancement in the Gilbert damping parameter α, the quantification of α is not necessarily straightforward in epitaxial thin films that exhibit pronounced anisotropic non-Gilbert damping 23,[32][33][34][35][36][37] . It has also been unclear how the Gilbert and non-Gilbert components of damping in LSMO are each modified by an adjacent SRO layer.…”

Section: Introductionmentioning

confidence: 99%

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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Frequency dependence of spin relaxation in periodic systems

Cited by 50 publications

References 30 publications

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

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

Role of internal demagnetizing field for the dynamics of a surface-modulated magnonic crystal

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

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