Ferrimagnetic Resonance in Impurity Doped Yttrium Iron Garnet (YIG)

A research program aimed at understanding our earlier line width and anisotropy measurements on YIG has led to a study of ferrimagnetic resonance in doped crystals. YIG crystals have been grown containing appropriate concentrations (∼.01 to 5.0 atomic percent) of various impurities, including the 4f rare earth elements, members of the iron transition group, and several non-magnetic elements. This paper gives new results for the variation of the field for resonance with crystal direction at several temperatures in the liquid hydrogen and liquid helium range. In the case of holmium, sharp peaks in the Hres vs angle curve are seen which vary rapidly with temperature. The corresponding curves for the dysprosium containing sample do not show such sharp variations in (110), and at least in part do not vary with temperature below about 4°K. Though Kittel's recent theoretical results should apparently apply to the peaks in the holmium case, his results for the temperature dependence of the anomaly height and widt...