Exchange-bias stabilization of the magnetic nanoparticles in a granular alloy grown by reactive sputtering

Riveiro, J. M.; De Toro, J. A.; Andrés, J. P.; González, J. A.; Muñoz, T.; Goff, J. P.
April 2005
Applied Physics Letters;4/25/2005, Vol. 86 Issue 17, p172503
Academic Journal
The superparamagnetic blocking temperature of a series of granular Co22Ag78 alloys grown by reactive sputtering under oxygen atmosphere exhibits a minimum when plotted as a function of the oxygen pressure. The magnetic stabilization observed above this minimum is found to arise from the exchange-bias between the Co core and a CoO shell, which appears to be spin disordered. The initial decrease in the blocking temperature at low oxygen pressures is mainly attributed to the inhibition of RKKY-like interactions by the formation of an insulating oxide layer, too thin to give rise to exchange bias, around the ferromagnetic cores.


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