Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve
Zavoisky Physical-Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
2 L.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Russia
3 Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
4 Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01069 Dresden, Germany
5 Institute for Solid State Physics, Technical University Dresden, D-01062 Dresden, Germany
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Published online: 4 July 2018
In the present work we have studied the proximity-induced superconducting triplet pairing in CoOx/Py1/Cu/Py2/Cu/Pb spin-valve structure (where Py = Ni0:81Fe0:19). For CoOx(3 nm)/Py(3 nm)/Cu(4 nm)/Py(0.6 nm)/Cu(2 nm)/Pb(70 nm) we have studied the dependence of the Tc on the angle α between the direction of the cooling field and the external field both applied in the plane of the sample. We obtained that the Tc does not change monotonically with the angle but passes through a minimum. To observe an “isolated” triplet spin-valve effect we exploited the oscillatory feature of the magnitude of the ordinary spin-valve effect ΔTc in the dependence of the Py2-layer thickness dPy2. We determined the value of dPy2 at which ΔTc caused by the ordinary spin-valve effect is suppressed. This means that the difference in the Tc between the antiparallel and parallel mutual orientation of magnetizations of the Py1 and Py2 layers is zero. For such a sample a “pure” triplet spin-valve effect which causes the minimum in Tc at the orthogonal configuration of magnetizations has been observed.
© The Authors, published by EDP Sciences, 2018
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