First-principles study of the spin-mixing conductance in Pt/Ni$_{81}$Fe$_{19}$ junctions

Details First-principles study of the spin-mixing conductance in Pt/Ni$_{81}$Fe$_{19}$ junctions First-principles study of the spin-mixing conductance in Pt/Ni$_{81}$Fe$_{19}$ junctions

2011-10-12

arxiv.org/abs/1110.2546v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted for publication in Applied Physics Letters

Scientific paper

Based on the spin-pumping theory and first-principles calculations, the spin-mixing conductance (SMC) is theoretically studied for Pt/Permalloy (Ni$_{81}$Fe$_{19}$, Py) junctions. We evaluate the SMC for ideally clean Pt/Py junctions and examine the effects of interface randomness. We find that the SMC is generally enhanced in the presence of interface roughness as compared to the ideally clean junctions. Our estimated SMC is in good quantitative agreement with the recent experiment for Pt/Py junctions. We propose possible routes to increase the SMC in Pt/Py junctions by depositing a foreign magnetic metal layer in Pt, offering guidelines for designing the future spintronic devices.

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