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arXiv 1005.0685cond-mat.supr-concond-mat.str-el
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波导增强极化中子反射法研究V/Fe超导/铁磁单层膜的磁邻近效应

Magnetic proximity effects in V/Fe superconductor/ferromagnet single bilayer revealed by waveguide-enhanced polarized neutron reflectometry

Yu. N. Khaydukov, V. L. Aksenov, Yu. V. Nikitenko, K. N. Zhernenkov, B. Nagy, A. Teichert, R. Steitz, L. Bottyan

摘要:

用极化中子反射法研究了Cu(32 nm)/V(40 nm)/Fe(1 nm)/MgO超导/铁磁体(SC/FM)系统的磁邻近效应。与以前的研究相反,这里研究了单个SC/FM双层,并且排除了多层伪影。通过波导共振实现了所需的信号增强,即制备分别夹在高反射MgO衬底和Cu顶层之间的V(40 nm)/Fe(1 nm)SC/FM双层。在低于0.7TC的温度下观察到了一个新的磁态。表现为波导谐振峰的高度和宽度的系统变化。当温度从0.7 TC增加到TC时,观察到这种状态的逐渐衰减,伴随着漫散射的5%的增长。根据理论研究,这种行为是磁邻近效应的结果。由于薄FM层的存在,超导电子被极化,因此,在SC/FM界面附近,在SC中出现了厚度与超导体的相干长度ksi相当的附加磁性层。

英文摘要:

Polarized neutron reflectometry is used to study the magnetic proximity effect in a superconductor/ferromagnet (SC/FM) system of composition Cu(32nm)/V(40nm)/Fe(1nm)/MgO. In contrast to previous studies, here a single SC/FM bilayer, is studied and multilayer artefacts are excluded. The necessary signal enhancement is achieved by waveguide resonance, i.e. preparing the V(40nm)/Fe(1nm) SC/FM bilayer sandwiched by the highly reflective MgO substrate and Cu top layer, respectively . A new magnetic state of the system was observed at temperatures below 0.7 TC. manifested in a systematic change in the height and width of the waveguide resonance peak. Upon increasing the temperature from 0.7 TC to TC, a gradual decay of this state is observed, accompanied by a 5% growth of the diffuse scattering. According to theoretical studies, such behavior is the result of the magnetic proximity effect. Due to the presence of the thin FM layer the superconducting electrons are polarized and, as a result, near the SC/FM interface an additional magnetic layer appears in the SC with thickness comparable to ksi, the coherence length of the superconductor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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