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Evidence of a barrier oxidation dependence on the interfacial magnetism in Co/alumina based magnetic tunnel junctions

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5 Author(s)
Telling, N.D. ; Magnetic Spectroscopy Group, CCLRC Daresbury Laboratory, Warrington WA4 4AD, United Kingdom ; van der Laan, G. ; Ladak, S. ; Hicken, R.J.
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Soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co L2,3 edge have been applied to explore the near-interfacial magnetism of Co electrodes in Co/alumina based magnetic tunnel junctions. By taking into account the formation of CoO at the ferromagnetic (FM)/barrier interface, the change in the total magnetic moment on metallic Co atoms as a function of barrier oxidation has been determined. The results demonstrate a strong correlation between the Co moments and measured TMR values, and an enhancement in the Co moments for moderate oxidation times.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 8 )