Magnetoresistance of Ferromagnet/Superconductor/Ferromagnet Trilayer Microbridge Based on Diluted PdFe Alloy
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Magnetoresistance of Ferromagnet/Superconductor/Ferromagnet Trilayer Microbridge Based on Diluted PdFe Alloy L. N. Karelina+1) , V. V. Bolginov+ , Sh. A. Erkenov+∗ , S. V. Egorov+, I. A. Golovchanskiy∗×, V. I. Chichkov×, A. Ben Hamida×◦ , V. V. Ryazanov+∗× + Institute ∗ Moscow × Russian ◦ Leiden
of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia Institute of Physics and Technology, State University, 141700 Dolgoprudny, Russia
National University of Science and Technology (NUST) MISiS, 119049 Moscow, Russia
Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden – The Netherlands Submitted 16 September 2020 Resubmitted 26 October 2020 Accepted 5 November 2020
A negative magnetoresistive effect has been observed for ferromagnet/superconductor/ferromagnet (FSF) microbridges based on diluted ferromagnetic PdFe alloy containing as small as 1 % of magnetic atoms. The effect is represented by the sharp negative peak in magnetoresistance at magnetic fields opposite in sign to the initial saturated magnetizations. Microstructuring of the FSF trilayers does not suppress the effect: the most pronounced dips were obtained for the smallest bridges of 6–8 µm wide and 10–15 µm long. The negative magnetoresistance peak was observed at temperatures within the superconducting transition and reaches a noticeable value of up to 1.3 % of the normal state resistance. DOI: 10.1134/S0021364020230010
At present, development and application of spintronic devices based on the giant magnetoresistance (GMR) is an intensive field of science and technology (see, for example [1]). Use of a superconducting interlayer (S) between two ferromagnetic metals (F) instead of normal-metal interlayer was proposed in 1999 [2, 3]. The “Pseudo spin-valve effect” in FSF-trilayers allows to control superconductivity of a thin superconducting interlayer via mutual orientation of magnetizations M1 and M2 in ferromagnetic layers [4–6]. Several different manifestations of the spin-valve effect are discussed. The most straightforward one is based on suppression of superconductivity in F1 SF2 heterostructures due to spinordering antagonism between ferromagnetism and superconductivity. In the case of co-directional M1 and M2 orientation (P-orientation) of the outer ferromagnetic layers the superconducting layer critical temperature, Tc , is suppressed due to proximity effect, while in the opposite case (AP-orientation) the F-layer impacts slightly compensate each other and the suppression is weakened [2–6]. A similar effect is observed in the case when both ferromagnetic layers are located on the same side of the superconducting film (SFF structures) [7]. Both the “positive” effect with stronger suppression 1) e-maI:
for AP-orientation and the “negative” one with stronger suppression for P-orientation were observed experimentally depending on the thickness of the ferromagnetic layers [8, 9]. FSF and SFF-structures also demonstrate the triplet spin-valve effect predicted in [9–11] and observed in [12–19] in the case of non-colli
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