Summary: Journal of Magnetism and Magnetic Materials 272­276 (2004) e1299­e1300
Magnetic properties of lithographically defined rectangular
antidot permalloy arrays
C.C. Wang, A.O. Adeyeye*, C.C. Lin
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, Faculty of Engineering,
National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
Abstract
We have investigated the magnetic properties of rectangular antidot ð2 Â 10 mm2
Þ arrays embedded into 80 nm thick
continuous permalloy films with the inter-hole spacing of 2 and 6 mm: We observed that the presence of the rectangular
hole structures strongly modifies the shape of M­H loops, when compared with the reference continuous film.
Specifically, the coercivity increases drastically as the inter-hole spacing is reduced. This is in agreement with our
magnetic force microscopy images. Marked changes in both the shape and sign of the magnetoresistance curve were
also observed.
r 2003 Elsevier B.V. All rights reserved.
PACS: 75.70.Kw; 75.30.Gw; 75.60.Ch; 75.47.Àm
Keywords: Antidot array; Magnetic domain; Anisotropy; Magnetotransport; Patterned film
Recently, there have been interests in the magnetic
properties of magnetic antidot arrays [1­6]. It has been
proposed to be a new method of storage of data with the

Source: Adeyeye, Adekunle - Department of Electrical and Computer Engineering, National University of Singapore

Collections: Physics; Materials Science