Hierarchy of critical temperatures in four-layered ferromagnet/superconductor nanostructures and control devices

Abstract

The four-layered F/S/F${}^{\prime }$/S${}^{\prime }$ nanostructure consisting of rather dirty superconducting (S) and ferromagnetic (F) metals is studied within the theory of the proximity effect taking detailed account of the boundary conditions. The F/S structures with four F and S layers are shown to have considerably richer physics than the F/S/F trilayer (due to the interplay between the 0 and $\pi$ phase superconductivity and the 0 and $\pi$ phase magnetism) and even the F/S superlattices. The extra $\pi$ phase superconducting states obtained for the four-layered F/S/F${}^{\prime }$/S${}^{\prime }$ system are found to be different from the known "superlattice" states. The dependence of the critical temperatures versus the F layers thicknesses is investigated. An optimal set of parameters is determined, for which the difference between the critical temperatures for different states becomes significant, and the corresponding phase diagrams are plotted. It is proven that this system can have different critical temperatures for different S and S${}^{\prime }$ layers. A conceptual scheme of a control device with superconducting and magnetic recording channels that can be controlled separately using a weak external magnetic field is proposed on the basis of the F/S/F${}^{\prime }$/S${}^{\prime }$ nanostructure. The devices with four, five, six, and seven different states are explored.

13 pages, 5 figures

References in corpus (11)

• Proximity effects in superconductor-ferromagnet heterostructures
• Long-range effects in superconductor-ferromagnet structures
• Odd triplet superconductivity in superconductor/ferromagnet multilayered structures
• Nonmonotonic critical temperature in superconductor/ferromagnet bilayers
• Induced Ferromagnetism due to Superconductivity in Superconductor-Ferromagnet structures
• Triplet proximity effect in FSF trilayers
• Enhancement of the superconducting transition temperature in Nb/Permalloy bilayers by controlling the domain state of the ferromagnet
• Manifestation of triplet superconductivity in superconductor-ferromagnet structures
• Cryptoferromagnetic state in superconductor-ferromagnet multilayers
• Theory of proximity effect in superconductor/ferromagnet heterostructures
• Critical temperature of superconductor/ferromagnet bilayers

Cited by in corpus (2)

• Half-Metallic Superconducting Triplet Spin MultiValves
• Competitive 0 and π states in S/F multilayers: multimode approach