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



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Navarro Palma, Elena and Vélez, M. and Huttel, Y. and Pérez Junquera, A. and Martín, J. Y. and Lima, O. F. de and Cebollada, A. and Alameda, J. M. and Vicent López, José Luis (2009) Magnetic order of Cr thin films in Nb/Cr/Fe-nanoisland hybrid: a comparative study between magnetic and superconducting properties. Journal of applied physics, 105 (3). ISSN 0021-8979

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Shifted 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.

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© 2009 American Institute of Physics.
Work was supported by Spanish Ministerio de Educacion y Ciencia under Grant Nos. NAN2004-09087, FIS2005- 07392, FIS2008-06249, Consolider CSD2007-00010, Consolider-Ingenio-2007 Nanoselect 26400, and MAT2005- 05524-C02 and Comunidad de Madrid under Grant Nos. 2006-CM-ESP-0337-0505 CITECNOMIK and S-0505/ MAT/0194 NANOMAGNET. O.F.d.L. wants to thank Banco Santander–UCM for a sabbatical professorship and the Brazilian science agencies FAPESP and CNPq for the partial support. Y.H. acknowledges the program “Ramón y Cajal.”

Uncontrolled Keywords:Sn-119 mossbauer-spectroscopy; Exchange bias; Fe/Cr(001) superlattices; Giant magnetoresistance; Transition-temperature; Fe(110) islands; Multilayers; Layers; Fe; Trilayers
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:44936
Deposited On:02 Nov 2017 12:38
Last Modified:05 Jul 2018 15:23

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