Expansion of initial magnetization region in BaTi1.2Co1.2Fe9O19-δ at low temperature
Abstract
BaTi1.2Co1.2Fe9O19-δ hexagonal ferrite was prepared by solid state reaction method sintered at 1250 °C, and its structure was examined by XRD and SEM, its magnetic properties were measured by VSM and BH analyzer at different temperature between -60 °C and 120 °C. It was found that no power loss minimum can be observed in the power loss versus temperature data when the initial permeability reaches a peak at 60 °C. Magnetic losses analysis indicated that the hysteresis loss is very small at -60 °C. The real part of permeability μ‧ is a field independent constant in H < 500 A/m at -60 °C, while μ‧ shows linear field dependence in the measured field range at 60 °C. The sample shows constant μ‧ with very low hysteresis loss in H < 500 A/m at -60 °C, which is consistent with the characteristic of the initial magnetization region, so conclusion is that initial magnetization region expands to high magnetic field with decreasing temperature in BaTi1.2Co1.2Fe9O19-δ hexagonal ferrite. This characteristic may serve as a new way to achieve low loss soft magnetic materials.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- February 2018
- DOI:
- 10.1016/j.jmmm.2017.09.048
- Bibcode:
- 2018JMMM..447...21F
- Keywords:
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- Hexagonal ferrites;
- Hysteresis loss;
- Initial magnetization region