| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1799463 | Journal of Magnetism and Magnetic Materials | 2015 | 7 Pages |
•We have synthesized the crystallographic single-phase Cu2U-type hexagonal ferrite.•MS is found to be 46.8 A·m2/kg at 300 K and 65.0 A·m2/kg at 5 K.•TC is 420°C. It is lower than TCM-type (450°C) but higher than TCCu2Y-type (320°C).•The estimated saturation magnetization is consistent with experimental MS at 5 K.
We have investigated the synthesis conditions, and the magnetic properties of the Cu2U-type hexagonal ferrite, Ba4Cu2Fe36O60. The Cu2U-type hexaferrite was synthesized at the sintering temperature of 1050 °C with the initial composition of Ba4.4Cu2Fe37.6O62.8 (Cu2U+0.2T-block). The saturation magnetizations at 300 K and 5 K are 46.8 A m2/kg and 65.0 A m2/kg, respectively. The Curie temperature is 420 °C which is lower than that of the M-type ferrite (450 °C) but higher than that of the Cu2Y-type ferrite (320 °C). The amount of the nonmagnetic impurity in this sample is estimated to be about 10 wt% by the electron probe micro analysis. We estimated the expected saturation magnetization to be 65.2 A m2/kg, by assuming the model of a Néel-type ferrimagnetic structure and the reduction of magnetization by the 10 wt% nonmagnetic impurity. This is consistent with the observed magnetization of 65.0 A m2/kg at 5 K.
