π magnetic states of ferromagnet/superconductor superlattices
Physical Review B(2001)
Abstract
For the ferromagnetic metal/superconductor $(\mathrm{FM}/S)$ superlattices, $0\ensuremath{\pi}$ and $\ensuremath{\pi}\ensuremath{\pi}$ states with antiferromagnetic ordering of the FM layers magnetizations are predicted. If the S layer thickness ${d}_{s}$ is less than the threshold value ${d}_{s}^{\ensuremath{\pi}},$ these states have a higher critical temperature ${T}_{c}$ than the earlier known ferromagnetic states $00$ and $\ensuremath{\pi}0.$ Therefore, the ${T}_{c}$ oscillation origin at ${d}_{s}<{d}_{s}^{\ensuremath{\pi}}$ is due to the $0\ensuremath{\pi}\ensuremath{-}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{-}0\ensuremath{\pi}$ phase transition cascade, whereas at ${d}_{s}>{d}_{s}^{\ensuremath{\pi}}$ it is related to the sequence of transitions $00\ensuremath{-}\ensuremath{\pi}0\ensuremath{-}00.$ A type of logical device combining the advantages of the superconducting and magnetic recording channels in one sample is offered on the $\mathrm{FM}/S$ superlattice base.
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Key words
display=inline><mmlmi>π</mmlmi></mmlmath>magnetic states,ferromagnet/superconductor,superlattices
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