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The optimisation of sputtered CoNi/Pt multilayers for thermomagnetic writing has been studied with relation to the layer thickness, film structures and sputtering conditions. It was found that the writing was more easily performed in CoNi/Pt multilayers than Co/Pt multilayers because of lower Curie temperature in CoNi/Pt multilayers. The films deposited at a lower Ar pressure displayed sharp magnetisation reversal that results in the sharp domain boundaries around the written domains. The films deposited at a higher Ar pressure showed the undesirable microstructures and unsuitable magnetic properties which result in the worse written domains. The large perpendicular coercivity obtained in the film deposited at higher Ar pressure is attributed to the large voids in the film.

OPTIMISATION OF CoNi/Pt MULTILAYERS COMPARED WITH Co/Pt MULTILAYERS FOR THERMOMAGNETIC WRITING