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Summary: IEEE TRANSACTIONS ON NANOTECHNOLOGY, VOL. 4, NO. 5, SEPTEMBER 2005 523
Coercivity Variation in Ni80Fe20
Ferromagnetic Nanowires
Sarjoosing Goolaup, Student Member, IEEE, Navab Singh, and Adekunle Olusola Adeyeye, Member, IEEE
Abstract--Deep ultraviolet lithography was used to fabricate
highly ordered 80-nm-thick Ni80Fe20 nanowire arrays over a
large area (4 4 mm2). The magnetic properties of the wire array
display a marked increase in both the coercivity and switching
field due to magnetic shape anisotropy compared with the bulk
film. The angular variation of the coercivity for nanowire arrays
has been investigated in order to probe the magnetization reversal
process. Our systematic study of the coercivity variation, which is
also aided by theoretical modeling, reveals that the curling mode
of rotation is the dominant reversal mechanism.
Index Terms--Magnetic anisotropy, magnetic films, magnetic
hysteresis, nanotechnology.
I. INTRODUCTION
CONSIDERABLE interest is being given to patterned
nanoscale magnetic materials due to novel-size de-
pendent properties exhibited by these materials. Magnetic
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