title: A facile approach for screening isolated nanomagnetic behavior for bit-patterned media.
abstract: Bit-patterned media (BPM) fabricated by the direct deposition of magnetic material onto prepatterned arrays of nanopillars is a promising approach for increasing magnetic recording of areal density. One of the key challenges of this approach is to identify and control the magnetic interaction between the bits (on top of the nanopillars) and the trench material between the pillars. Using independent techniques, including magnetic force microscopy, the variable-angle magneto-optic Kerr effect, and remanence curves, we were able to determine the presence and relative intensities of exchange and dipolar interactions in Co-Pd multilayer-based BPM fabricated by direct deposition. We found that for pitches of 30 nm or less, there were negligible exchange interactions, and the bits were found to be magnetically isolated. As we move to higher densities, the absence of exchange interactions indicates that direct deposition is a promising approach to BPM fabrication.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576 Singapore.
authors.forename: Naganivetha
authors.initials: N
authors.lastname: Thiyagarajah
authors.forename: Mohamed
authors.initials: M
authors.lastname: Asbahi
authors.forename: Rick T J
authors.initials: RT
authors.lastname: Wong
authors.forename: Kendrick W M
authors.initials: KW
authors.lastname: Low
authors.forename: Nikolai L
authors.initials: NL
authors.lastname: Yakovlev
authors.forename: Joel K W
authors.initials: JK
authors.lastname: Yang
authors.forename: Vivian
authors.initials: V
authors.lastname: Ng