Brillouin light scattering study of spin waves in NiFe/Co exchange spring bilayer films

Haldar, Arabinda; Banerjee, Chandrima; Laha, Pinaki; Barman, Anjan

doi:10.1063/1.4870053

Cited by 32 publications

(20 citation statements)

References 27 publications

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“…To obtain the wave-vector selectivity, the sample is rotated in vertical plane thus allowing access to various angles of incidence of laser on the sample. Details of the BLS set up can be found elsewhere 36 38 . For the larger incidence angles, the spectra were obtained after counting photons for several hours.…”

Section: Methodsmentioning

confidence: 99%

Direct Observation of Interfacial Dzyaloshinskii-Moriya Interaction from Asymmetric Spin-wave Propagation in W/CoFeB/SiO2 Heterostructures Down to Sub-nanometer CoFeB Thickness

Chaurasiya

Banerjee

Pan

et al. 2016

Sci Rep

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Interfacial Dzyaloshinskii-Moriya interaction (IDMI) is important for its roles in stabilizing the skyrmionic lattice as well as soliton-like domain wall motion leading towards new generation spintronic devices. However, achievement and detection of IDMI is often hindered by various spurious effects. Here, we demonstrate the occurrence of IDMI originating primarily from W/CoFeB interface in technologically important W/CoFeB/SiO2 heterostructures using Brillouin light scattering technique. Due to the presence of IDMI, we observe asymmetry in the peak frequency and linewidth of the spin-wave spectra in the Damon-Eshbach (DE) geometry at finite k wave-vectors. The DMI constant is found to scale as the inverse of CoFeB thickness, over the whole studied thickness range, confirming the presence of IDMI in our system without any extrinsic effects. Importantly, the W/CoFeB interface shows no degradation down to sub-nanometer CoFeB thickness, which would be useful for devices that aim to use pronounced interface effects.

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Section: Methodsmentioning

confidence: 99%

Direct Observation of Interfacial Dzyaloshinskii-Moriya Interaction from Asymmetric Spin-wave Propagation in W/CoFeB/SiO2 Heterostructures Down to Sub-nanometer CoFeB Thickness

Chaurasiya

Banerjee

Pan

et al. 2016

Sci Rep

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“…The observed VNA-FMR cannot be explained solely by effects associated with reduced NiFe thickness, e.g., the two-magnon scattering mechanism due to interface roughness. 54,55 Even for NiFe thicknesses of 5 nm, a clear FMR signal should be observable for the full range of frequencies studied. 2f shows the VNA-FMR for a NiFe thickness of 10 nm (the same as in Figure 1e) but for the field applied perpendicular to the sample plane.…”

Section: Resultsmentioning

confidence: 93%

Optically and Microwave-Induced Magnetization Precession in [Co/Pt]/NiFe Exchange Springs

Dąbrowski

Frisk

Burn

et al. 2020

ACS Appl. Mater. Interfaces

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Microwave and heat assisted magnetic recording are two competing technologies that have greatly increased the capacity of hard disk drives. The efficiency of the magnetic recording process can be further improved by employing non-collinear spin structures that combine perpendicular and in-plane magnetic anisotropy. Here, we investigate both microwave and optically excited magnetization dynamics in [Co/Pt]/NiFe exchange spring samples. The resulting canted magnetization within the nanoscale [Co/Pt]/NiFe interfacial region allows for optically stimulated magnetization precession to be observed for an extended magnetic field and frequency range. The results can be explained by formation of an imprinted domain structure, which locks the magnetization orientation and makes the structures more robust against external perturbations. Tuning the canted interfacial domain structure may provide greater control of optically excited magnetization reversal and optically generated spin currents, which are of paramount importance for future ultrafast magnetic recording and spintronic applications.

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“…Nitrogen doping in the Ta underlayer was performed by mixing N 2 with Ar during Ta deposition. 24. Q was varied up to 9% with Q ¼ 0 corresponding to pure Ta underlayer.…”

Section: Methodsmentioning

confidence: 99%

Improved magnetic damping in CoFeB|MgO with an N-doped Ta underlayer investigated using the Brillouin light scattering technique

et al. 2015

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Understanding the role of interfacial roughness on magnetic damping is important for developing advanced spintronic based devices. Using Brillouin light scattering (BLS), here we investigate the interfacial roughness contributing to magnetic inhomogeneity in the technologically important ultrathin CoFeB|MgO heterostructures with Ta and N-doped Ta underlayers. The spin wave frequencies corresponding to uniform precession modes in the BLS spectra for perpendicularly magnetized as well as in-plane magnetized films are investigated. The linewidth shows pronounced dependence on the N-doping in the underlayer. The analysis of linewidth suggests that the magnetic inhomogeneity and the damping reduce significantly by N-doping in the underlayer.

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Brillouin light scattering study of spin waves in NiFe/Co exchange spring bilayer films

Cited by 32 publications

References 27 publications

Direct Observation of Interfacial Dzyaloshinskii-Moriya Interaction from Asymmetric Spin-wave Propagation in W/CoFeB/SiO2 Heterostructures Down to Sub-nanometer CoFeB Thickness

Direct Observation of Interfacial Dzyaloshinskii-Moriya Interaction from Asymmetric Spin-wave Propagation in W/CoFeB/SiO2 Heterostructures Down to Sub-nanometer CoFeB Thickness

Optically and Microwave-Induced Magnetization Precession in [Co/Pt]/NiFe Exchange Springs

Improved magnetic damping in CoFeB|MgO with an N-doped Ta underlayer investigated using the Brillouin light scattering technique

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