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The issue of interlayer exchange coupling in magnetic multilayers withsuperconducting (SC) spacer is addressed in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$(LSMO) - YBa$_{2}$Cu$_{3}$O$_{7}$ (YBCO) - La$_{0.67}$Sr$_{0.33}$MnO$_{3}$(LSMO) epitaxial trilayers through resistivity, ac-susceptibility andmagnetization measurements. The ferromagnetic (FM) LSMO layers possessingin-plane magnetization suppress the critical temperature (T$_{c})$ of thec-axis oriented YBCO thin film spacer. The superconducting order, however,survives even in very thin layers (thickness d$_{Y} \sim $ 50 {\AA}, $\sim $ 4unit cells) at T $<$ 25 K. A predominantly antiferromagnetic (AF) exchangecoupling between the moments of the LSMO layers at fields $<$ 200 Oe is seen inthe normal as well as the superconducting states of the YBCO spacer. Theexchange energy J$_{1}$ ($\sim $ 0.08 erg/cm$^{2}$ at 150 K for d$_{Y}$ = 75{\AA}) grows on cooling down to T$_{c}$, followed by truncation of this growthon entering the superconducting state. The coupling energy J$_{1}$ at a fixedtemperature drops exponentially with the thickness of the YBCO layer. Thetemperature and d$_{Y}$ dependencies of this primarily non-oscillatory J$_{1}$are consistent with the coupling theories for systems in which transport iscontrolled by tunneling. The truncation of the monotonic T dependence ofJ$_{1}$ below T$_{c}$ suggests inhibition of single electron tunneling acrossthe CuO$_{2}$ planes as the in-plane gap parameter acquires a non-zero value.Comment: Accepted for publication in Phys. Rev.

physical review. b, condensed matter and materials physics

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Superconducting and normal-state interlayer exchange coupling inLa0.67Sr0.33MnO3−Y