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Superconductivity as a probe of magnetic switching and ferromagnetic stability in Nb/Ni multilayers

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De Long, LE and Kryukov, S. A. and Bosomtwi, A. and Xu, WT and González Herrera, Elvira María and Navarro Palma, Elena and Villegas, J. E. and Vicent López, José Luis and Yu, Ct and Pechan, MJ (2006) Superconductivity as a probe of magnetic switching and ferromagnetic stability in Nb/Ni multilayers. Philosophical magazine, 86 (17-18). pp. 2735-2760. ISSN 1478-6435

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Official URL: http://dx.doi.org/10.1080/14786430500422308




Abstract

The temperature and field dependences of the AC and DC magnetic moment of superconducting and ferromagnetic Nb/Ni multilayers were measured using a SQUID magnetometer with magnetic field applied parallel to the multilayer plane. Periodic kinks in the superconducting upper critical field are evidence for nucleation of a hierarchy of Abrikosov vortex lattices aligned parallel to the multilayer. Small cusps in the low-field, isothermal DC magnetization are evidence that supercurrents are sensitive to extremely small changes in the Ni layer magnetization. Smooth ferromagnetic hysteresis is observed in the normal state, but is supplanted below the superconducting transition by two reproducible discontinuities that indicate magnetic switching of the Ni layers is tightly coupled to the supercurrents. The discontinuities are attributed to the non-dipole character of the moment near switching fields and, therefore, cannot be analyzed by standard magnetometer software. Ferromagnetic resonance spectra were measured in parallel and perpendicular DC magnetic fields at room temperature and 4.2 K, and resulting data suggest that Ni layers interact magnetically in the superconducting state.


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© Taylor & Francis Ltd.
International Workshop on Electron Correlations and Material Properties (3. 2004. Cos, Grecia).
Research at the University of Kentucky was supported by US DoE Grant #DE-FG02-97ER45653. Research at the Universidad Complutense was supported by a Spanish CICYT Grant #MAT02-04543 and ESF VORTEX Program. Research at Miami niversity was supported by a US DoE Grant #DE-FG02-86ER45281.

Uncontrolled Keywords:Layered superconductors; Surface-barrier; Flux lattices; Thin-films; Superlattices; Temperature; Transition; Field; Resonance; Interplay
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:45324
Deposited On:03 Nov 2017 17:51
Last Modified:03 Nov 2017 17:51

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