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Thermal properties of Ti-doped Cu-Zn soft ferrites used as thermally actuated material for magnetizing superconductors

Stachowiak, P and Mucha, J and Szewczyk, D and Zhai, Y and Hsu, CH and Coombs, TA and Fagnard, JF and Philippe, MP and Vanderbemden, P (2016) Thermal properties of Ti-doped Cu-Zn soft ferrites used as thermally actuated material for magnetizing superconductors. Journal of Physics D: Applied Physics, 49. ISSN 0022-3727

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Abstract

© 2016 IOP Publishing Ltd. A great majority of widely used ferrite ceramics exhibit a relatively high temperature of order-disorder phase transition in their magnetic subsystem. F or applications related to the magnetization process of superconductors, however, a low value of T c is required. Here we report and analyze in detail the thermal properties of bulk Ti-doped Cu-Zn ferrite ceramics Cu 0.3 Zn 0.7 Ti 0.04 Fe 1.96 O 4 and Mg 0.15 Cu 0.15 Zn 0.7 Ti 0.04 Fe 1.96 O 4 . They are characterized by a Curie temperature in the range 120-170 K and a maximum DC magnetic susceptibility exceeding 20 for the Cu 0.3 Zn 0.7 Ti 0.04 Fe 1.96 O 4 material. The temperature dependence of both the specific heat C p and of the thermal conductivity κ, determined between 2 and 300 K, are found not to exhibit any peculiar feature at the magnetic transition temperature. The low-temperature dependence of both κ and the mean free path of phonons suggests a mesoscopic fractal structure of the grains. From the measured data, the characteristics of thermally actuated waves are estimated. The low magnetic phase transition temperature and suitable thermal parameters make the investigated ferrite ceramics applicable as magnetic wave producers in devices designed for magnetization of high-temperature superconductors.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:12
Last Modified: 19 Sep 2017 01:29
DOI: