Abstract

An enhancement of $^{3}\mathrm{He}$ nuclear magnetization has been observed in the experiment of $^{3}\mathrm{\ensuremath{-}}^{63}$Cu double nuclear resonance for $^{3}\mathrm{He}$ in contact with small copper particles, when the $^{63}\mathrm{Cu}$ nuclear resonance was simultaneously excited. The enhancement is explained by a model which assumes that electron spins of surface cupric oxides mediate a magnetic coupling between $^{3}\mathrm{He}$ and $^{63}\mathrm{Cu}$ nuclear spins.

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