Remanent magnetization of ceramic and single‐crystal high‐Tcsuperconductors in tilted magnetic fields
作者:
Yu. V. Bugoslavsky,
A. A. Minakov,
S. I. Vasyurin,
期刊:
Journal of Applied Physics
(AIP Available online 1996)
卷期:
Volume 79,
issue 4
页码: 1996-2002
ISSN:0021-8979
年代: 1996
DOI:10.1063/1.361051
出版商: AIP
数据来源: AIP
摘要:
Dependence of the remanent magnetization (Mr) anisotropy on the structure and shape of the superconductor and on the magnetizing procedure was studied for a number of high‐Tcsuperconductor ceramics and single crystals. The experiments were done by means of a vibrating‐sample magnetometer with a rotatable sample holder. It was found that the main contribution to the anisotropic behavior ofMris due to the surface screening currents, and therefore the anisotropy is subject to variation when sample shape is changed. The question is resolved, why the effective demagnetization factors for decoupled ceramic samples are different from those calculated in the inscribed‐ellipsoid approximation. Influence of inhomogeneous grain magnetization and global bulk currents on the angular dependencies ofMrin ceramic samples is investigated. The evolution of remanence in YBCO single crystals with an increase of the magnetizing field is described within an extended Bean model. ©1996 American Institute of Physics.
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