0000000000185823

AUTHOR

Thomas Brächer

showing 2 related works from this author

Low-damping spin-wave propagation in a micro-structured Co2Mn0.6Fe0.4Si Heusler waveguide

2012

We report on the investigation of spin-wave propagation in a micro-structured Co2Mn0.6Fe0.4Si (CMFS) Heusler waveguide. The reduced magnetic losses of this compound compared to the commonly used Ni81Fe19 allow for the observation of spin-wave propagation over distances as high as 75 μm via Brillouin light scattering (BLS) microscopy. In the linear regime, a maximum decay length of 16.7 μm of the spin-wave amplitude was found. The coherence length of the observed spin-wave modes was estimated to be at least 16 μm via phase-resolved BLS techniques.

Materials sciencePhysics and Astronomy (miscellaneous)business.industryLight scatteringlaw.inventionCoherence lengthBrillouin zoneAmplitudeOpticsSpin wavelawDecay lengthMicroscopyCondensed Matter::Strongly Correlated ElectronsbusinessWaveguideApplied Physics Letters
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Heisenberg Exchange and Dzyaloshinskii–Moriya Interaction in Ultrathin Pt(W)/CoFeB Single and Multilayers

2021

We present results of the analysis of Brillouin light-scattering (BLS) measurements of spin waves performed on ultrathin single and multirepeat CoFeB layers with adjacent heavy metal layers. From a detailed study of the spin-wave dispersion relation, we independently extract the Heisenberg exchange interaction (also referred to as symmetric exchange interaction), the Dzyaloshinskii–Moriya interaction (DMI, also referred to as antisymmetric exchange interaction), and the anisotropy field. We find a large DMI in CoFeB thin films adjacent to a Pt layer and nearly vanishing DMI for CoFeB films adjacent to a W layer. Furthermore, the influence of the dipolar interaction on the dispersion relatio…

Materials scienceAntisymmetric exchangeCondensed matter physicsMagnetoresistanceExchange interactionElectronic Optical and Magnetic MaterialsBrillouin zoneCondensed Matter::Materials ScienceSpin waveDispersion relationDispersion (optics)Condensed Matter::Strongly Correlated ElectronsElectrical and Electronic EngineeringAnisotropyIEEE Transactions on Magnetics
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