ANOMALOUS MAGNETIC-PROPERTIES OF FERRITES OF THE CUFE2-XCRXO4 SYSTEM WITH HIGH CR3+ CONTENT

The paper reports on a comprehensive study of magnetic properties of C uFe2-xCrxO4 ferrites (x = 0.0, 0.2, 0.3, 1.0, 1.4, 1.6, and 2.0). The curves of magnetization versus temperature, sigma(s)(T), of the ferrit es with x=1.0, 1.4, and 1.6 have anomalous shapes: the magnetization b egins to fall off at lower temperatures than the Curie point T-C. The experimental results and analysis of exchange interactions suggest tha t in ferrites with high Cr3+ content, magnetic transitions to either a frustrated magnetic structure or a clustered spin glass can take plac e. (C) 1997 American Institute of Physics.