Effects of magnetic substrates on ac losses of YBa2Cu3O7 films in perpendicular ac magnetic fields

被引：26

作者：

Suenaga, Masaki ^{[1
]}

Li, Qiang ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 26期

关键词：

D O I：

10.1063/1.2218305

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Effects of a magnetic substrate on the ac losses of superconducting films were investigated by measuring the losses for octagonal disks of an YBa2Cu3O7 layer on a magnetic Ni-5 at. % W substrate in perpendicular ac magnetic fields at 20 Hz and 77 K. At low fields, the losses depended on ac magnetic field amplitude B and film thickness t as proportional to B-3/t instead of proportional to B-4/t(3) for a superconducting film on a nonmagnetic substrate. These results are described by considering the formation of a virtual infinite stack of superconducting films due to the magnetic mirror effect. (c) 2006 American Institute of Physics.

引用

页数：3

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