Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance

Conca, A.; Keller, Sascha; Schweizer, Matthias R.; Papaioannou, Evangelos Th.; Hillebrands, B.

doi:10.1103/physrevb.98.214439

Cited by 31 publications

(21 citation statements)

References 37 publications

(58 reference statements)

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“…The exact conditions for observation, however, depend on the material parameters and the spin-wave dispersion. For instance, in epitaxial Fe films, the low frequency ∆H behavior deviates only from a linear behavior when magnetic dragging due to crystalline anisotropy is dominant [19].…”

mentioning

confidence: 99%

Low damping magnetic properties and perpendicular magnetic anisotropy in the Heusler alloy Fe1.5CoGe

et al. 2019

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We present a study of the dynamic magnetic properties of TiN-buffered epitaxial thin films of the Heusler alloy Fe1.5CoGe. Thickness series annealed at different temperatures are prepared and the magnetic damping is measured, a lowest value of α = 2.18 × 10 −3 is obtained. The perpendicular magnetic anisotropy properties in Fe1.5CoGe/MgO are also characterized. The evolution of the interfacial perpendicular anisotropy constant K ⊥ S with the annealing temperature is shown and compared with the widely used CoFeB/MgO interface. A large volume contribution to the perpendicular anisotropy of (4.3 ± 0.5) × 10 5 J/m 3 is also found, in contrast with vanishing bulk contribution in common Co-and Fe-based Heusler alloys.

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confidence: 99%

Low damping magnetic properties and perpendicular magnetic anisotropy in the Heusler alloy Fe1.5CoGe

et al. 2019

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“…In the case of Fe/Pt we will mostly observe the influence of g ↑↓ eff on the interface quality. It should be noted that the damping can also be influenced by effects like magnetic proximity or two magnon scattering 28 which may complicate the analysis.…”

Section: Ferromagnetic Resonance Measurementsmentioning

confidence: 99%

Correlation of interface transmission in THz spintronic emitters with spin mixing conductance in spin pumping experiments

Papaioannou¹,

Scheuer²,

Ruhwedel³

et al. 2020

Preprint

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The field of THz spintronics is a novel direction in the research field of spintronics that combines magnetism with optical physics and ultrafast photonics. The experimental scheme of the field involves the use of femtosecond laser pulses to trigger ultrafast spin and charge dynamics in bilayers composed of ferromagnetic (FM) and nonmagnetic (NM) thin films where the NM layer features a strong spin-orbit coupling. The key technological and scientific challenges of THz spintronic emitters is to increase their intensity and frequency bandwidth. To achieve this the control of the source of the radiation, namely the transport of the ultrafast spin current is required. However, the transfer of a spin current from a FM to a NM layer is a highly interface-sensitive effect. In this work we study the properties of the spin current transport through the interface measuring the strength of the THz emission and compare it to the effective spin mixing conductance, one of the key concepts in the spin current transport through interfaces. The results show an enhancement of the spin mixing conductance for interfaces with higher degree of epitaxy similarly to the improvement of the THz emission. The proportionality between spin mixing conductance and THz emission can define new directions in engineering the emission of spintronic THz emitters.

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“…The Fe/Pt system has recently attracted further attention in magnetic dynamics studies, since the large spin-orbit coupling in Pt gives rise to spin-dependent Hall effects, when in contact with a magnetic layer. Spin pumping measurements in Fe/Pt bilayers revealed an efficient spin transport through epitaxial interfaces [ 16 , 17 , 18 ], the role of two-magnon scattering in the quantification of the spin mixing conductance [ 19 ], while the Fe/Pt bilayers are perfect candidates for THz-sources based on the spin to charge conversion via the ISHE [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal and Dynamics in Epitaxial Fe/Pt Spintronic Bilayers Stimulated by Interfacial Fe3O4 Nanoparticles

et al. 2021

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We have explored the impact of elevated growth and annealing temperatures on the local interfacial structure of thin Fe(12 nm)/Pt(10 nm) spintronic bilayers, epitaxially grown on MgO (100), and their correlation to magnetization reversal and dynamics. Electron-beam evaporation growth and subsequent annealing at 450 °C causes significant roughening of the MgO/Fe interface with irregular steps and multilevel (100) MgO surface terraces. Consequently, threading dislocations emerging at the step edges propagated in the Fe layer and terminated at the Fe/Pt interface, which appears pitted with pits 1.5–3 nm deep on the Fe side. Most of the pits are filled with the overlying Pt, whereby others by ferrimagnetic Fe3O4, forming nanoparticles that occupy nearly 9% of the Fe/Pt interfacial area. Fe3O4 nanoparticles occur at the termination sites of threading dislocations at the Fe/Pt interface, and their population density is equivalent to the density of threading dislocations in the Fe layer. The morphology of the Fe/Fe3O4/Pt system has a strong impact on the magnetization reversal, enhancing the coercive field and inducing an exchange bias below 200 K. Furthermore, low-temperature spin pumping and inverse spin Hall effect voltage measurements reveal that below their blocking temperature the nanoparticles can influence the spin current transmission and the spin rectification effects.

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Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance

Cited by 31 publications

References 37 publications

Low damping magnetic properties and perpendicular magnetic anisotropy in the Heusler alloy Fe1.5CoGe

Low damping magnetic properties and perpendicular magnetic anisotropy in the Heusler alloy Fe1.5CoGe

Correlation of interface transmission in THz spintronic emitters with spin mixing conductance in spin pumping experiments

Magnetization Reversal and Dynamics in Epitaxial Fe/Pt Spintronic Bilayers Stimulated by Interfacial Fe3O4 Nanoparticles

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