Surface spin diffusion in platinum nanometer-sized crystals

I. Yu and W. P. Halperin
Phys. Rev. B 47, 15830 – Published 15 June 1993
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Abstract

Nanometer-sized crystalline platinum particles have been studied by Pt195 nuclear magnetic-resonance techniques after their removal from a silica support. The spectra show very well-resolved bulk and surface resonance peaks in contrast to supported particles of similar size. Evidence for restricted surface spin diffusion was found from spin-spin relaxation measurements performed on the surface peak. The length scale of the restriction was found to be about 10 Å possibly associated with surface irregularities. The nuclear-spin diffusion process can be attributed to the Ruderman-Kittel-Kasuya-Yosida indirect exchange coupling between surface Pt atoms the strength of which was found to be the same as that in bulk platinum.

  • Received 4 December 1992

DOI:https://doi.org/10.1103/PhysRevB.47.15830

©1993 American Physical Society

Authors & Affiliations

I. Yu

  • Department of Physics, College of Natural Science, Seoul National University, Seoul 151-742, Korea

W. P. Halperin

  • Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208

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Vol. 47, Iss. 23 — 15 June 1993

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