Magnetic Proximity Effects in V/Fe Superconductor/Ferromagnet Single Bilayer Revealed by Waveguide-Enhanced Polarized Neutron Reflectometry
Magnetic Proximity Effects in V/Fe Superconductor/Ferromagnet Single Bilayer Revealed by Waveguide-Enhanced Polarized Neutron Reflectometry
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波导增强偏振中子反射法揭示 V/Fe 超导体/铁磁体单双层中的磁邻近效应
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
L. Bottyán
中科院分区：
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作者：
Y. Khaydukov;V. Aksenov;Y. Nikitenko;K. Zhernenkov;B. Nagy;A. Teichert;R. Steitz;A. Rühm;L. Bottyán
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。必要的信号增强通过波导谐振实现，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的温度下观察到一个新的磁态，表现在波导谐振峰的高度和宽度的系统变化。当温度从0.7TC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。这种行为可以通过超导电子在SC转变时的极化以自然的方式解释，即，由于FM层的接近，SC内出现额外的感应磁化。
Polarized neutron reflectometry is used to study the magnetic proximity effect in a superconductor/ferromagnet (SC/FM) system of composition Cu(32 nm)/ V(40 nm)/Fe(1 nm)/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(40 nm)/Fe(1 nm) 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 0.7TC manifested in a systematic change in the height and width of the waveguide resonance peak. Upon increasing the temperature from 0.7TC to TC, a gradual decay of this state is observed, accompanied by a 5% growth of the diffuse scattering. This behavior can be explained in a natural way by the polarization of the superconducting electrons upon the SC transition, i.e., an appearance of additional induced magnetization within the SC, due to the proximity of the FM layer.