M.W. Pieper

Rare earth substitutions in M-type ferrites

In this paper, the effects of a partial substitution of Sr by either Sm or Nd but also by La in SrFe/sub 12/O/sub 19/ on the fundamental magnetic properties is investigated. Hysteresis loop measurements were performed using a pulsed field magnetometer. The anisotropy fields of the samples was measured using the SPD method.

59Co NMR in ErCo3

Abstract NMR measurements of 59 Co in ferrimagnetic ErCo3 have been carried out between 4.2 and 120 K in external fields up to 7 T . The zero-field powder spectrum at 4.2 K shows three resolved lines at 23, 65, and 96 MHz . In a field along the c-axis the two lower frequencies decrease with increasing field at 10.01 MHz/T , while the upper one increases at the same rate. The temperature dependence of the upper line gives strong indication that the Co-moment of this sublattice decreases discontinuously at the transition temperature 100 K .