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Probing submicron nanomagnets by magneto-optics R. P. Cowburn,a)

Summary: Probing submicron nanomagnets by magneto-optics
R. P. Cowburn,a)
D. K. Koltsov, A. O. Adeyeye, and M. E. Welland
Nanoscale Science Group, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ,
United Kingdom
Received 20 August 1998; accepted for publication 22 October 1998
A hybrid magneto-optical magnetometer and optical microscope has been designed and constructed
for probing the magnetic properties of submicron nanomagnets. 10-nm-thick square nanomagnets
have been fabricated individually and in small arrays from Ni80Fe14Mo5 ``supermalloy'' by
electron-beam lithography. Hysteresis loops with a good signal-to-noise ratio have been obtained
from individual nanomagnets as small as 400 nm and from 5 m 2
arrays of nanomagnets ranging
in size from 500 to 75 nm. 1998 American Institute of Physics. S0003-6951 98 03552-9
Magnetism at small length scales has in recent years
provided a wealth of scientific interest and potential techno-
logical applications.1
Recent advances in nanometer scale
fabrication technology have opened up the possibility of
studying artificially fabricated zero-dimensional magnetic
systems in which all three dimensions are geometrically con-


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


Collections: Physics; Materials Science