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Effect of magnetic flux penetration on the magnetic hysteresis loops of a Pt/Co/Pt triple layer on Nb(110)

Joshi, N. 1; Sürgers, Christoph ORCID iD icon 1; Löhneysen, Hilbert von 1; Löffler, W. 1; Kalt, H. 1
1 Center for Functional Nanostructures (CFN), Karlsruher Institut für Technologie (KIT)


The magnetic properties of (20 Å Pt/15 Co/20 Å Pt) triple layer deposited on a thick Nb(110) substrate are measured by vibrating sample magnetometry and the polar magneto-optical Kerr effect (p-MOKE). Above the superconducting transition temperature Tc 9.1 K of Nb an out-of-plane magnetization curve M(H) is observed by p-MOKE due to the perpendicular magnetic anisotropy of the Pt/Co/Pt triple layer. Cooling the sample below Tc gives rise to a modification of the M(H) hysteresis with a sudden change of the magnetization for magnetic fields smaller than the coercive field Hcoerc of the ferromagnetic triple layer. This is due to the penetration of magnetic vortices into the center of the weak-pinning superconducting Nb disk for fields above the lower critical field. These vortices generate an enhanced local magnetic field at the Nb surface which is larger than Hcoerc of the Pt/Co/Pt triple layer and locally switches isolated domains already for applied fields smaller than Hcoerc. © 2010 IOP Publishing Ltd.

DOI: 10.1088/1742-6596/200/7/072096
Zitationen: 1
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2010
Sprache Englisch
Identifikator ISSN: 1742-6596
KITopen-ID: 1000050538
Erschienen in Journal of Physics: Conference Series
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 200
Heft 7
Seiten 072096
Nachgewiesen in Scopus
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