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Magnetization reversal and exchange bias effects in hard/soft ferromagnetic bilayers with orthogonal anisotropies

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1367-2630_14_11_113001.pdf (863.9Kb)
Date
2012-11-02
Author
Navas Otero, David
Torrejón, J.
Béron, F.
Redondo Esteban, Carolina
Batallan, F.
Toperverg, B. P.
Devishvili, A.
Sierra Izquierdo, Borja
Castaño Almendral, Fernando
Pirota, K. R
Ross, C. A
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New Journal of Physics 14 : (2012) // 113001
URI
http://hdl.handle.net/10810/11647
Abstract
The magnetization reversal processes are discussed for exchange-coupled ferromagnetic hard/soft bilayers made from Co0.66Cr0.22Pt0.12 (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.
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