Characterization of spin pumping effect in Permalloy/Cu/Pt microfabricated lateral devices

Tatsuya Yamamoto, Takeshi Seki, Shimpei Ono, Koki Takanashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We studied ferromagnetic resonance (FMR) for microfabricated lateral devices consisting of a Permalloy (Py) rectangular element and a Pt nano-element bridged by a Cu wire, which were located on a coplanar waveguide. A change in the resonance linewidth (Δf) was observed in the FMR spectra when the distance between Py and Pt (d) was varied. For devices with d < 400 nm, Δf definitely increased, suggesting the enhancement of the Gilbert damping constant (α). We discussed a possible reason for the this enhancement taking into account the increase in the efficiency of spin pumping into Cu due to the spin absorption of the attached Pt.

Original languageEnglish
Article number17C505
JournalJournal of Applied Physics
Issue number17
Publication statusPublished - 2014 May 7


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