Resonant Precession of Magnetization and Precession -- Induced DC voltages in FeGaB Thin Films
arXiv:2201.03739 · doi:10.1088/1361-6463/ac34ab
Abstract
Measurements of frequency dependent ferromagnetic resonance (FMR) and spin pumping driven dc voltage (V_{dc}) are reported for amorphous films of Fe_{78}Ga_{13}B_{9} (FeGaB) alloy to address the phenomenon of self-induced inverse spin Hall effect (ISHE) in plain films of metallic ferromagnets. The V_{dc} signal, which is antisymmetric on field reversal, comprises of symmetric and asymmetric Lorentzians centered around the resonance field. Dominant role of thin film size effects is seen in setting the magnitude of static magnetization, V_{dc} and dynamics of magnetization precession in thinner films (\leq 8 nm). The film thickness dependence of magnetization parameters indicates the presence of a magnetically disordered region at the film-substrate interface, which may promote preferential flow of spins generated by the precessing magnetization towards the substrate. However, the V_{dc} signal also draws contributions from rectification effects of a \approx 0.4 \% anisotropic magnetoresistance and a large (\approx 54 nΩ.m) anomalous Hall resistivity (AHR) of these films which ride over the effect of spin-orbit coupling driven spin-to-charge conversion near the film-substrate interface. We have addressed these data in the framework of the existing theories of electrodynamics of a ferromagnetic film subjected to radio-frequency field in a coplanar waveguide geometry. Our estimation of the self-induced ISHE for the sample with 54 nΩ.m AHR shows that it may contribute significantly (\approx 90\%) to the measured symmetric voltage. This study is expected to be very useful for fully understanding the spin pumping induced dc voltages in metallic ferromagnets with disordered interfaces and large anomalous Hall effect.
arXiv comment9 figures
References in corpus (20)
- Enhanced Gilbert Damping in Thin Ferromagnetic Films
- Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
- Interface-Induced Phenomena in Magnetism
- Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
- Detection and quantification of inverse spin Hall effect from spin pumping in permalloy/normal metal bilayers
- Giant Planar Hall Effect in Epitaxial (Ga,Mn)As Devices
- Ultra-low magnetic damping of a metallic ferromagnet
- On the line shape of the electrically detected ferromagnetic resonance
- Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
- Quantum Materials for Spin and Charge Conversion
- Microwave photovoltage and photoresistance effects in ferromagnetic microstrips
- Planar Hall effect from the surface of topological insulators
- Self-induced inverse spin Hall effect in permalloy at room temperature
- Dependence of spin pumping spin Hall effect measurements on layer thicknesses and stacking order
- Reciprocal spin Hall effects in conductors with strong spin-orbit coupling: a review
- Magnonic Charge Pumping via Spin-Orbit Coupling
- Relative weight of the inverse spin Hall and spin rectification effects for metallic Py,Fe/Pt and insulating YIG/Pt bilayers estimated by angular dependent spin pumping measurements
- Self-induced inverse spin Hall effect in ferromagnets: demonstration through non-monotonous temperature-dependence in permalloy
- Quantification of the spin-Hall anti-damping torque with a resonance spectrometer
- Linear magnetization dependence and large intrinsic anomalous Hall effect in Fe78Si9B13 metallic glasses