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VOLUME 83, NUMBER 5 P H Y S I C A L R E V I E W L E T T E R S 2 AUGUST 1999 Single-Domain Circular Nanomagnets
 

Summary: VOLUME 83, NUMBER 5 P H Y S I C A L R E V I E W L E T T E R S 2 AUGUST 1999
Single-Domain Circular Nanomagnets
R. P. Cowburn,* D. K. Koltsov, A. O. Adeyeye, and M. E. Welland
Nanoscale Science Group, Department of Engineering, University of Cambridge, Trumpington Street,
Cambridge CB2 1PZ, United Kingdom
D. M. Tricker
Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street,
Cambridge CB2 3QZ, United Kingdom
(Received 15 January 1999)
The magnetic properties of deep submicron circular nanomagnets fabricated by high-resolution
electron beam lithography from Supermalloy Ni80Fe14Mo5 have been studied as a function of both
diameter (50055 nm) and thickness (615 nm). A high sensitivity magneto-optical method has been
used to measure the hysteresis loops of these nanomagnets. An experimental phase diagram in diameter
and thickness has thus been produced which identifies a vortex phase and a single-domain phase. The
two phases agree well with micromagnetic theory.
PACS numbers: 75.50.Tt, 75.30.Kz, 75.60.d, 78.20.Ls
Magnetism at small length scales has in recent years
provided a wealth of scientific interest and potential
technological applications [1]. Recent advances in
nanometer scale fabrication technology have opened

  

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

 

Collections: Physics; Materials Science