Abstract
An approach for tailoring the magnetic properties by ion irradiation of granular perpendicularCoCrPt:SiO2 films grown on silica particles with sizes down to 10 nm was investigated. The as-preparedsamples reveal an intriguing scaling dependence of the coercive field and remnantmagnetization: both parameters are found to decrease with decreasing particle size. However,Co + irradiation at alow fluence of 0.5 × 1014 cm − 2 already results in an opposite scaling behavior. It is assumed that this modification is dueto the enhancement of the intergranular magnetic exchange coupling of the granularCoCrPt:SiO2 filminitiated by Co + irradiation resulting in a modified reversal behavior. Further increase of the irradiation fluence beyond1.6 × 1014 ions cm − 2 leads to a degradation of the magnetic layer properties, lowering the remnantmagnetization and the coercive field in the easy-axis direction. Moreover, the localmagnetic properties of the samples were analyzed by magnetic force microscopy revealingmagnetic multi-domain cap structures.
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