title: Evidence of interactions in Co-HfO2 granular films.
abstract: Co-HfO(2) granular films with varying numbers of bilayers were studied by means of transmission electron microscopy (TEM), magnetization loops and zero-field-cooled and field-cooled (ZFC-FC) magnetization. Grain size properties inferred from the measurement techniques were found to be different from those observed from TEM. We show that a modified Langevin function that accounts for dipolar interactions reconciles grain size properties observed by TEM. The mean blocking temperature seen from ZFC-FC analysis was observed to be greater compared to that inferred from TEM data. Moreover, it exhibited a trend with increasing numbers of bilayers. We proposed an explanation for these differences on the basis of the degree of dipolar interactions.
authors.affiliation: Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
authors.forename: M
authors.initials: M
authors.lastname: Chadha
authors.forename: V
authors.initials: V
authors.lastname: Ng