Optical determination of spin diffusion length and interfacial spin mixing conductance in epitaxial Pd/Fe bilayers
Abstract
We present a detailed study of the photoinduced magnetization precession and magnetic relaxation in epitaxial Pd/Fe films on MgO(0 0 1) substrates via all-optical pump-probe techniques. We explicitly formulate the correlation between the Gilbert damping and the effective damping in the optical approach. Furthermore, a non-local Gilbert damping induced by spin pumping is demonstrated self-consistently by the Gilbert damping dependence on Pd thickness and the [ image ] relationship of damping with Fe thickness [ image ]. The non-local Gilbert damping enables the determination of spin diffusion length [ image ] in Pd and interfacial spin mixing conductance [ image ]. Our work paves the way toward the optical determination of spin transport parameters.
- Publication:
-
Journal of Physics Condensed Matter
- Pub Date:
- July 2019
- DOI:
- 10.1088/1361-648X/ab1a99
- Bibcode:
- 2019JPCM...31D5802L
- Keywords:
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- spin diffusion length;
- spin mixing conductance;
- TRMOKE;
- epitaxial films;
- damping