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APS » Journals » Phys. Rev. Lett. » Volume 83 » Issue 5
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Phys. Rev. Lett. 83, 1042–1045 (1999)

Single-Domain Circular Nanomagnets

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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; published in the issue dated 2 August 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 (500–55 nm) and thickness (6–15 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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.1042
DOI:
10.1103/PhysRevLett.83.1042
PACS:
75.50.Tt, 75.30.Kz, 75.60.-d, 78.20.Ls

*Electronic address: rpc12@cus.cam.ac.uk

 
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