Magnetization reversal and exchange bias effects in hard/soft ferromagnetic bilayers with orthogonal anisotropies
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Navas-2012-Magnetization revers.pdf
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Author(s)
Ross, Caroline A.
Navas, David Otero
Torrejon, J.
Beron, F.
Redondo, C.
Batallan, Francisco
Toperverg, P.
Devishvili, Anton
Sierra, B.
Castano, F.
Date Issued
November 2012
Journal
New Journal of Physics
Publisher
IOP Publishing
Citation
Navas, D et al. “Magnetization Reversal and Exchange Bias Effects in Hard/soft Ferromagnetic Bilayers with Orthogonal Anisotropies.” New Journal of Physics 14.11 (2012): 113001. © 2012 IOP Publishing
Version
Final published version
Abstract
The magnetization reversal processes are discussed for exchange-coupled ferromagnetic hard/soft bilayers made from Co[subscript 0.66]Cr[subscript 0.22]Pt[subscript 0.12] (10 and 20 nm)/Ni (from 0 to 40 nm) films with out-of-plane and in-plane magnetic easy axes respectively, based on room temperature hysteresis loops and first-order reversal curve analysis. On increasing the Ni layer thicknesses, the easy axis of the bilayer reorients from out-of-plane to in-plane. An exchange bias effect, consisting of a shift of the in-plane minor hysteresis loops along the field axis, was observed at room temperature after in-plane saturation. This effect was associated with specific ferromagnetic domain configurations experimentally determined by polarized neutron reflectivity. On the other hand, perpendicular exchange bias effect was revealed from the out-of-plane hysteresis loops and it was attributed to residual domains in the magnetically hard layer.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported
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DOI of Published Version
https://doi.org/10.1088/1367-2630/14/11/113001
