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arXiv 0710.3695cond-mat.supr-con
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非常规超导体中畴壁引起的磁场分布

Magnetic Field Distribution Due to Domain Walls in Unconventional Superconductors

N. A. Logoboy

摘要:

研究了超导铁磁体中布洛赫畴壁的稳态特性。通过求解麦克斯韦方程组并辅以London方程,计算了永磁超电流在DW面内流动时超导磁体表面上下的磁场分布。它示出,部分的磁通量的两个相邻的域关闭在最近的附近的样品的表面引起的力的线从平行于DW平面的衰减。结果,样品表面的磁场法向分量的值仅达到体磁通量值的一半。在伦敦穿透深度的数量级的距离,磁场的下降,由于偶极子-偶极子相互作用的长程特性的逆幂律。后两种情况对于比较计算的磁场和用测量法向磁场的方法得到的数据是很重要的。G.霍尔探针技术,旨在证实非常规超导体中磁序参量的存在。

英文摘要:

Steady-state properties of Bloch domain wall (DW) in superconducting ferromagnet (SCFM) are studied. The distribution of magnetic field above and below the surface of the SCFM due to the permanent magnetization supercurrent flowing in the DW plane is calculated by solving Maxwell equations supplemented by London equation. It is shown that part of the magnetic flux of the two neighboring domains closures in the nearest vicinity of the surface of the sample giving rise to declination of the line of the force from being parallel to the DW plane. As a result, the value of the normal component of magnetic field at the surface of the sample reaches only half of the value of the bulk magnetic flux. At the distances of the order of value of London penetration depth the magnetic field decreases as inverse power law due to the long-range character of dipole-dipole interaction. The last two circumstances are important for comparison the calculated magnetic field with the data obtained by the methods on measurement of normal component of magnetic field, e. g. Hall probe technique, aimed to confirm the existence of magnetic order parameter in unconventional superconductor.

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