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Magnetic order of Cr thin films in Nb/Cr/Fe-nanoisland hybrid: A comparative study between magnetic and superconducting properties

AuthorsNavarro, Elena; Vélez, María ; Huttel, Yves ; Pérez-Junquera, A.; Martín, José Ignacio ; Lima, O. F. de; Cebollada, Alfonso ; Alameda, J. M. ; Vicent, J. L.
Issue Date2009
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 105(3): 033912 (2009)
AbstractShifted hysteresis loops characteristic of the exchange bias effect between a ferromagnet and an antiferromagnet are demonstrated in structures formed by a 2.5 nm Cr layer deposited on top of an array of Fe nanoislands (Cr/Fe-nanoislands). This effect evidences the persistence of antiferromagnetic (AF) order for Cr layers much thinner than the thickness reported in the literature. The field shift measured is found to increase for the smallest island sizes, which can be related with the enhancement of the Fe-nanoisland surface to volume ratio. The comparative study between superconducting proximity effects in Nb/Cr/Fe-nanoislands and Nb/normal metal/Fe-nanoisland hybrids (where the normal metals used are Al and Pt) confirms the presence of AF order in the 2.5 nm Cr spacer layer. A much shorter penetration depth of the Cooper pairs into the AF Cr layers than in the normal metal Pt and Al spacer layers is deduced.
Description7 páginas, 4 figuras, 1 tabla.
Publisher version (URL)http://dx.doi.org/10.1063/1.3075740
Appears in Collections:(ICMM) Artículos
(IMN-CNM) Artículos
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