This article is cited in 8 papers

CONDENSED MATTER

$\pi$-phase magnetism in ferromagnet-superconductor superlattices

M. G. Khusainov^ab, Yu. A. Izyumov^c, Yu. N. Proshin<sup>a

a</sup> Kazan State University
^b Tupolev Kazan State Technical University
^c Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg

Abstract: New $0\pi$ and $\pi \pi$ Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) states with antiferromagnetic orientation of magnetizations in the neighboring layers of a ferromagnetic metal (FM) are predicted for FM/superconductor (FM/S) superlattices. Under certain conditions, the critical temperature $T_c$ of these states is higher than for the known $00$ and $\pi 0$ LOFF states with ferromagnetic ordering of the FM layers. It is shown that the nonmonotonic behavior of $T_c$ in the FM/S superlattices with $S$-layer thickness $d_s$ less than the threshold value $d^\pi_s$ is due to the phase transition cascade $0\pi-\pi \pi-0\pi$ at $d_s>d^\pi_s$, the $T_c$ oscillations are caused by the $00-\pi0-00$ transitions. New logic elements based on the FM/S structures and combining the advantages of the superconducting and magnetic data-record channels in a single sample are proposed.

PACS: 74.50.+r, 74.62.-c, 74.80.Dm

Received: 31.10.2000
Revised: 22.02.2001

 English version: Journal of Experimental and Theoretical Physics Letters, 2001, 73:7, 344–348

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