Effective ferromagnetic coupling between a superconductor and a ferromagnet in LaCaMnO/Nb hybrids
Effective ferromagnetic coupling between a superconductor and a ferromagnet in LaCaMnO/Nb hybrids
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DOI：
10.1103/physrevb.72.212514
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发表时间：
2005-11
影响因子：
3.7
通讯作者：
D. Stamopoulos;N. Moutis;M. Pissas;D. Niarchos
中科院分区：
文献类型：
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作者：
D. Stamopoulos;N. Moutis;M. Pissas;D. Niarchos
在这项工作中，我们提出的混合物组成的多层（ML）的锰氧化物[La 0.33Ca 0.67MnO 3/La 0.60Ca 0.40MnO 3]15与低Tc Nb超导体（SC）接触的磁化数据。虽然一个纯SC应该表现出抗磁性相对于外部磁场在我们的ML-SC混合，我们观察到，SC的磁化如下的ML。我们有趣的实验结果表明，SC低于其TSC c成为铁磁耦合的ML。结果，在预期SC的抗磁性行为的区域中，其体磁化仅在超过ML的矫顽场时切换。通过采用特定的实验，ML是有选择性地偏置或不，我们证明了ML造成其磁性能的整个混合。可能的解释进行了讨论，在最近的理论建议和实验结果，在相对的混合动力车。
In this work we present magnetization data on hybrids consisting of multilayers (MLs) of man- ganites [La0.33Ca0.67MnO3/La0.60Ca0.40MnO3]15 in contact with a low-Tc Nb superconductor (SC). Although a pure SC should behave diamagnetically in respect to the external magnetic field in our ML-SC hybrids we observed that the magnetization of the SC follows that of the ML. Our intriguing experimental results show that the SC below its TSC c becomes ferromagnetically coupled to the ML. As a result in the regime where diamagnetic behaviour of the SC was expected its bulk magne- tization switches only whenever the coercive field of the ML is exceeded. By employing specific experiments where the ML was selectively biased or not we demonstrate that the ML inflicts its magnetic properties on the whole hybrid. Possible explanations are discussed in connection to recent theoretical proposals and experimental findings that were obtained in relative hybrids.