NMR spectra and relaxations of 57Fe in calcium-doped yttrium iron garnet films

Abstract Effect of Ca 2+ substitution on the 57 Fe NMR spectra and relaxations was measured in YIG epitaxial films. A satellite line caused by the presence of Ca 2+ was identified in the spectra of d-sites of YIG:Ca, Ca–Ge and Ca–Si films. In a YIG:Ca series, after an initial constant region a decrease of a spin–lattice relaxation rate was observed in a dependence on the increasing Ca 2+ content. The onset of the relaxation rate decrease is supposed to correspond to the induced decrease of an amount of Fe 2+ ions, while charge compensation is reached by other mechanisms for lower calcium content.