Nuclear magnetic resonance on oriented rare-earth nuclei in rare-earth hosts: Application to 160Tb.
We summarize the application of nuclear magnetic resonance of oriented nuclei to rare-earth impurities implanted in ferromagnetic crystals of heavy rare-earth hosts. The experimental aspects are treated in some detail; we present results obtained on $^{160}\mathrm{Tb}$$\mathrm{Tb}$, and give a formal description of the experiments. A discussion of extension to other, similar systems with applications in nuclear, solid-state, and low-temperature physics is given.
Tb magnetic moment behaviour in a Gd single crystal: nuclear orientation study
Low-temperature nuclear orientation has been used to study the behaviour of the Tb magnetic moment in a Gd + 1 at.% Tb single crystal. The -ray anisotropy of several lines was monitored in the temperature range of 5-50 mK and in the external magnetic field range of 0-8.5 T. The field was applied either along the a- or along the c-axis of the Gd single crystal. In the case of parallel to the a-axis the Tb magnetic moment was found to be almost aligned along even at very low fields, as expected because the hexagonal basal plane is an easy magnetization plane for the Tb ion in terbium metal. On the other hand, when is along the c-axis the Tb magnetic moment rotates very slowly towards the c-axis. Even at the Tb magnetic moment is not along the direction of . This is in contrast to the fast saturation of the gadolinium ions in pure Gd. Apparently, the Tb-Gd exchange interaction is in competition with the crystal field acting on the Tb ion in a hexagonal lattice, our data indicates that at along the c-axis the angle between the Tb magnetic moment and the applied field is of the order of .
Dilute-impurity hyperfine fields in Fe, Co, Ni, and Gd
Abstract All the available experimental data on the hyperfine fields in the ferromagnetic hosts of Fe, Co, Ni, and Gd have been collected and tabulated. The best values for dilute-impurity hyperfine fields in Fe, Co, and Ni hosts are plotted as functions of the solute atomic number. Some useful relations of the curves to impurity electronic configurations are pointed out.