Abstract
We present $\ensuremath{\beta}$-detected NMR measurements of the spin-lattice relaxation of $^{8}\mathrm{Li}^{+}$ implanted into an epitaxial heterostructure based on a 100 nm thick film of ferromagnetic (FM) EuO as a function of temperature through its FM transition. In the FM state, the spin-lattice relaxation rate follows the same temperature dependence, determined by magnon scattering mechanisms, observed in the bulk by $^{153}\mathrm{Eu}$ NMR, but above 40 K, the signal is wiped out. We also find that $^{8}\mathrm{Li}^{+}$ stopped in material adjacent to the magnetic layer exhibits spin relaxation related to the critical slowing of the Eu spins. A particularly strong relaxation in the Au overlayer suggests an unusual strong nonlocal coupling mechanism to $^{8}\mathrm{Li}$ in the metal.
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