Different regimes of nucleation of superconductivity in mesoscopic superconductor/ferromagnet hybrids

N. Schildermans; A. Yu. Aladyshkin; A. V. Silhanek; J. Van de Vondel; V. V. Moshchalkov

doi:10.1103/PhysRevB.77.214519

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Different regimes of nucleation of superconductivity in mesoscopic superconductor/ferromagnet hybrids

N. Schildermans, A. Yu. Aladyshkin, A. V. Silhanek, J. Van de Vondel, V. V. Moshchalkov

DOI 10.1103/PhysRevB.77.214519 · Physical Review B

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Abstract

The competition between two regimes of the nucleation of superconductivity is investigated experimentally and theoretically in a mesoscopic disk-shaped superconductor/ferromagnet hybrid. By changing the magnetic state of a multilayered Co/Pt disk one can reversibly affect the magnetic-field dependence of the critical temperature Tc(H) of an Al layer. We demonstrate that an enhancement of the magnetic field near the edge of the out-of-plane magnetized disk either stimulates the nucleation of superconductivity at the disk perimeter due to the field compensation effect or prevents it due to edge magnetic barrier (for relatively low |H| values). As a consequence, the presence of such magnetic-field pattern makes it possible to eliminate boundary effects for mesoscopic superconducting samples. Switching from one nucleation regime to another while sweeping H leads to an abrupt change of the slope of the Tc(H) envelope.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.275	Pressure not reported	unknown