NDLI: Soft Ferrite Used as Thermal-Magnetic Conversion Intermedium in the Flux Pumping Technology

Content Provider	IEEE Xplore Digital Library
Author	Yujia Zhai Hsu, C.H. Spaven, F. Zhang, M. Wang, W. Coombs, T.A.
Copyright Year	2002
Abstract	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 Mg_0.15Cu_0.15 Zn_0.7Ti_0.04Fe_1.96O₄, 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.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	7800104
Ending Page	7800104
Page Count	1
File Size	334407
File Format	PDF
ISSN	10518223
Volume Number	23
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ferrites Permeability Temperature measurement Superconducting magnets Yttrium barium copper oxide relative permeability flux pumping high temperature superconductors
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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