Moraru Ion C, Pratt W P, Birge Norman O
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA.
Phys Rev Lett. 2006 Jan 27;96(3):037004. doi: 10.1103/PhysRevLett.96.037004.
We have measured the superconducting transition temperature Tc of Ni/Nb/Ni trilayers when the magnetizations of the two outer Ni layers are parallel (P) and antiparallel (AP). The largest difference in occurs when the Nb thickness is just above the critical thickness at which superconductivity disappears completely. We have observed a difference in Tc between the P and AP states as large as 41 mK--a significant increase over earlier results in samples with higher Tc and with a CuNi alloy in place of the Ni. Our result also demonstrates that strong elemental ferromagnets are promising candidates for future investigations of ferromagnet/superconductor heterostructures.
我们测量了两层外层镍层磁化方向平行（P）和反平行（AP）时镍/铌/镍三层膜的超导转变温度Tc。当铌层厚度刚好高于超导完全消失的临界厚度时，出现了最大差异。我们观察到P态和AP态之间的Tc差异高达41 mK，相较于早期具有更高Tc且用铜镍合金替代镍的样品的结果有显著增加。我们的结果还表明，强元素铁磁体是未来铁磁体/超导体异质结构研究的有前景的候选材料。
