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RESEARCH PRODUCT
Heisenberg Exchange and Dzyaloshinskii–Moriya Interaction in Ultrathin Pt(W)/CoFeB Single and Multilayers
Burkard HillebrandsSamridh JaiswalFrank HeussnerKyujoon LeeThomas BrächerPhilipp PirroTobias BöttcherGerhard JakobMathias Kläuisubject
Materials scienceAntisymmetric exchangeCondensed matter physicsMagnetoresistanceExchange interactionElectronic Optical and Magnetic MaterialsBrillouin zoneCondensed Matter::Materials ScienceSpin waveDispersion relationDispersion (optics)Condensed Matter::Strongly Correlated ElectronsElectrical and Electronic EngineeringAnisotropydescription
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 relation and on the evaluation of the Heisenberg exchange parameter is demonstrated. Eventually, an experimental analysis of the impact of the DMI on the spin-wave lifetime is presented.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-07-01 | IEEE Transactions on Magnetics |