Exchange coupling of bilayers and synthetic antiferromagnets pinned to MnPt
INESC-MN, R. Alves Redol 9, 1000 Lisboa, Portugal
2 IFIMUP, Universidade do Porto, R. Campo Alegre, 4100 Porto, Portugal
3 Department of Physics and Astronomy, University of Glasgow, University Avenue, Glasgow, UK
Corresponding author: a email@example.com
Revised: 8 January 2005
Published online: 8 March 2005
Exchange bias and blocking temperature were studied in MnPt based bottom-pinned bilayers and synthetic antiferromagnets (SAF) prepared by magnetron sputtering. The structure and magnetic properties were determined as a function of the MnPt layer thickness. Exchange coupling was found to be ( erg/cm for a MnPt ( nm)/CoFe (5 nm) bilayer. The distribution of the blocking temperature TB was analyzed and its width and center point determined. TB is about 280 C for thinner MnPt films, and increases to 330 °C for thick films. is constant for thick MnPt but steadily increases as the thickness decreases. SAF structures show higher exchange bias and higher at thin layer thickness ( nm) compared to bilayers.
PACS: 75.50.Ee – Antiferromagnetics / 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 85.70.Kh – Magnetic thin film devices: magnetic heads; domain-motion devices, etc.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005