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Enhanced Exchange Bias of Spin Valves Fabricated on Fullerene-Based Seed Layers

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3 Author(s)
M. Wheeler ; School of Physics and Astronomy, Condensed Matter Department,, University of Leeds,, Leeds, U.K. ; B. J. Hickey ; O. Cespedes

The magnetic properties of exchange biased systems deposited on top of fullerene-based materials have been studied. An enhanced exchange bias field has been observed for Si/SiO2/C60/Co/Cu/Co/IrMn/Ta and Si/SiO2 /FeC60 /Co/Cu/Co/IrMn/Ta in comparison to a typical structure of Si/SiO2/Ta/Co/Cu/Co/IrMn/Ta. Here the magnetic properties of the devices are changed significantly with an organic underlayer or seed layer. The magnetic ordering is well maintained, and C60 seeding results in an exchange bias of (19.5 ±0.5) mT, some 7 mT higher than that of Ta seeded spin valves (12.5 ±0.5 mT). A combination of MOKE (magneto-optical Kerr effect), X-ray diffraction and Raman spectroscopy have been used to characterize the materials and further understand the interactions between the Co and fullerene-based materials.

Published in:

IEEE Transactions on Magnetics  (Volume:48 ,  Issue: 11 )