Internal field distribution on Au in the Au-Fe system in the limit of very small concentration

Nonsaturation of hyperfine fields on Au and Fe has been studied primarily with regard to the existence of the Aharoni angle. With the use of both nuclear orientation and magnetic resonance on ${}_{}{}^{189m}{}_{}{}^{}\mathrm{Au}$ in Fe, the hypothesis of a conical field distribution is shown to be unfounded—even at very moderate external magnetic field values—for well-prepared samples with small Au concentration. [${}_{}{}^{181}{}_{}{}^{}\mathrm{Ta}({}_{}{}^{12}{}_{}{}^{}\mathrm{C},xn){}_{}{}^{189m}{}_{}{}^{}\mathrm{Au}$, mass separation, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ dilution refrigeration, $\gamma$ anisotropies, Ge detection].