G Malinowski, M. Albrecht, I. L. Guhr, J. M. D. Coey and S. van Dijken 'Size-dependent scaling of perpendicular exchange bias in magnetic nanostructures' in Physical Review B - Condensed Matter and Materials Physics, 75, (4), 2007, 012423
Physical Review B - Condensed Matter and Materials Physics 75 4
Size-dependent scaling is studied in exchange biased nanostructures obtained by depositing Pt/Co 3 /IrMn
multilayers with perpendicular magnetization onto an array of monodisperse polystyrene nanospheres with a
diameter ranging from 58 nm to 320 nm. We find that the exchange bias field increases with the inverse of the
sphere diameter when the IrMn layer is single domain. This scaling behavior, which is favorable for further
miniaturization of magnetic devices, can be understood within the context of a random field model by a
statistical distribution of Mn spins at the Co/IrMn interface.
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