The growth‐induced anisotropy K ug of Y3−ySmy Fe5−xGaxO12 films grown by liquid phase epitaxy on {111} GGG substrates is investigated. The growth rate v and not the growth temperature TG is found to be of primary importance for K ug of films grown from the same melt. The observed dependence of K ug on the samarium content y and on the growth rate v can be satisfactorily described by a model based on growth kinetics and site preference.
To investigate more economically the conditions for the reproducible growth of bubble films, growth rate measurements are made with the help of induced striations which are generated by changes of the rotation rate. The growth of { 111) oriented Y3--ySmyFe5--zGa,0,, epilayers is studied in dependence on time, supersaturation, and substrate rotation rate. Growth conditions and equilibrium distribution coefficients are presented for Ga and Sm. The experimental results are discussed in terms of the boundary layer model.
Der EinfluD verschiedener Temperungen auf das magnetische Spektrum von Ni-Zn-Co-Ferriten wurde im Frequenzbereich von 2 bis 300MHz untersucht. Nach einer Gluhbehandlung ohne Magnetfeld steigt die Resonanzfrequenz, bei welcher p" ein Maximum hat, mit dem Coo-Gehalt an. Nach Temperung in einem Magnetfeld, das parallel oder senkrecht zum MeBfeld war, ist die Abhangigkeit der Resonanzfrequenz vom Coo-Gehalt nur gering. Dieses Verhalten kann durch die Beseitigung einer Orientierungsuberstruktur von Ionen in den Bereichsgrenzen erklart werden. Fiir die Diskussion der Ergebnisse von Proben, die in einem Langsfeld getempert worden waren, wird das Model1 der Wandwolbung herangezogen.
The effect of small concentrations of substitutional cobalt ions on the spin-wave relaxation was measured using parallel-pumping. The cobalt contribution to the anisotropy of spin-waverelaxation is found to be very small. The fraction of cobalt ions which contribute to the relaxation is larger than the fraction expected from the theory. The departure from the theory and the temperature behaviour suggest that the cobalt ions contribute to a direct relaxation process to the lattice.Experimentelle Untersuchungen an Ferriteinkristallen mit kleinen Kobaltbeimengungen ergaben, daB die substituierten Kobaltionen die Dampfung von Spinwellen, die parametrisch durch Parallelfeld-Pumpen angeregt wurden, erheblich beeinflussen. Der Beitrag der Kobaltbeimengung zur Anisotropie der Spinwellenrelaxation ist relativ klein. Der Bruchteil der Kobaltionen, welche zur Relaxation beitragen, ist groBer als der nach bekannten theoretischen Vorstellungen zu erwartende. Die Abweichung von der Theorie und das Temperaturverhalten weisen darauf hin, daB die Kobaltionen zu einem direkten RelaxationsprozeB zum Gitter beitragen.The mechanism responsible for relaxation in ferrites have received increased interest in the last years. However, the experimental situation for atomicdisorder scattering is not yet entirely settled. White [l] has suggested that certain ions of the iron transition group may play a similar part in relaxation of the motion of the magnetization in ferrimagnetics as that played by the rare earth ions in ferrimagnetic garnet crystals. The divalent cobalt ion is one of these ions.Haas and Callen [2] have considered the contribution of small concentrations of substitutional cobalt ions to relaxation by scattering energy into spin waves of short wavelength. The mechanism considered by Haas and Callen is a magnon-magnon scattering mechanism. The effect of the spin-orbit coupling is enhanced in the cobalt ion because it has a degenerate orbital ground state when situated in a crystalline field of trigonal symmetry. This leads to the important result that the dominant linewidth contribution of a cobalt ion is isotropic.Teale [3] found that the linewidth varies rapidly and linearly with the amount of cobalt and that the two-magnon scattering by the cobalt did not make a significant contribution to the linewidth. Most measurements were done with the usual resonance experiment in which the rf field is applied perpendicular to the steady field (transverse-pumping experiment). For parallel-pumping the
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