Soft Ferrite Used as Thermal-Magnetic Conversion Intermedium in the Flux Pumping Technology
| Autor: | Yujia Zhai, Min Zhang, Wei Wang, C. H. Hsu, Tim Coombs, F. Spaven |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Superconductivity
Materials science High-temperature superconductivity Flux pumping Yttrium barium copper oxide Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetization chemistry.chemical_compound chemistry Permeability (electromagnetism) law Magnet Ferrite (magnet) Electrical and Electronic Engineering Composite material |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 23:7800104-7800104 |
| ISSN: | 2378-7074 1051-8223 |
| DOI: | 10.1109/tasc.2013.2237737 |
| Popis: | Recent progress in material science has proved that high-temperature superconductors, such as bulk melt-processed yttrium barium copper oxide (YBCO) single domains, have a great potential to trap significant magnetic fields. In this paper, we will describe a novel method of YBCO magnetization that only requires the applied field to be at the level of a permanent magnet. Instead of applying a pulsed high magnetic field on the YBCO, a thermally actuated material (TAM), such as Mg0.15Cu0.15 Zn0.7Ti0.04Fe1.96O4, has been used as an intermedium to create a travelling magnetic field by changing the local temperature so that the local permeability is changed to build up the magnetization of the YBCO gradually after multiple pumping cycles. It is well known that the relative permeability of ferrite is a function of temperature and its electromagnetic properties can be greatly changed by adding dopants such as Mg or Ti; therefore, it is considered to be the most promising TAM for future flux pumping technology. Ferrite samples were fabricated by means of the conventional ceramic method with different dopants. Zinc and iron oxides were used as raw materials. The samples were sintered at 1100 °C, 1200 °C , and 1300 °C . The relative permeability of the samples was measured at temperatures ranging from 77 to 300 K. This work investigates the variation of the magnetic properties of ferrites with different heat treatments and doping elements and gives a smart insight into finding better ferrites suitable for flux pumping technology. |
| Databáze: | OpenAIRE |
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