Abstract
Polycrystalline Y-type barium cobalt ferrite (Ba2Co2Fe12O22; Co2Y) was synthesized using by the conventional ceramic method. At temperatures below 260 K, the crystal structure of Co2Y was determined to be hexagonal with the space group \(R\bar 3m\). It showed a soft ferrimagnetic behavior with Hc = 113 Oe at 297 K and the Neel temperature (TN) was determined to be 615 K. Most of the super-lattice peaks of Co2Y coming from the spin structure decreased with increasing temperature. However, the super-lattice peak at 21.8° increased with increasing temperature at temperatures above 200 K. In addition, we observed a change in the slope of the zero-field cooled magnetization under a low field of 0.01 T at 215 K due to a magnetic structure transition from a helical to a ferrimagnetic spin structure.
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