Title :
Exchange-coupled FePt/Fe bilayers with perpendicular magnetization
Author :
Casoli, Francesca ; Albertini, Franca ; Fabbrici, Simone ; Bocchi, Claudio ; Nasi, Lucia ; Ciprian, Roberta ; Pareti, Luigi
Author_Institution :
IMEM-CNR, Parma, Italy
Abstract :
We have realized perpendicular hard/soft bilayers with exchange-spring behavior, based on FePt-L10 and Fe. Studying the magnetization process as a function of the soft-layer thickness, two different coupling regimes have been identified, i.e., the rigid-magnet and exchange-spring regimes. High values of the maximum energy product (12.4 MGOe) and remanent magnetization (750 emu/cm3) have been found in the exchange-coupled bilayers.
Keywords :
exchange interactions (electron); ferromagnetic materials; iron alloys; magnetic multilayers; magnetisation; platinum alloys; soft magnetic materials; FePt-Fe; exchange-coupled bilayers; exchange-spring behavior; hard bilayers; magnetization process; perpendicular magnetization; rigid-magnet; soft bilayers; soft-layer thickness; Anisotropic magnetoresistance; Atomic force microscopy; Couplings; Demagnetization; Iron; Magnetic films; Magnetic materials; Magnetization; Permanent magnets; X-ray diffraction; Iron alloys; permanent magnets; perpendicular magnetic anisotropy; thin films;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854954
