Giant conductance anisotropy in magnetically coupled Ferromagnet-Superconductor-Ferromagnet structures

Belkin, A.; Novosad, V.; Iavarone, M.; Divan, R.; Hiller, J.; Proslier, T.; Pearson, J. E.; Karapetrov, G.
March 2010
Applied Physics Letters;3/1/2010, Vol. 96 Issue 9, p092513
Academic Journal
We demonstrate the evolution of the anisotropic conductivity in the superconductor that is magnetically coupled with two adjacent ferromagnetic layers. Stripe magnetic domain structure in the ferromagnetic layers results in directional superconducting order parameter in the superconducting layer. The conductance anisotropy strongly depends on the period of the magnetic domains and the strength of the local magnetization. The anisotropic conductivity of up to three orders of magnitude can be achieved with spatial critical temperature modulation of 5% of Tc. The effect could be exploited in low temperature nonvolatile logic and storage elements.


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