| Issue |
Europhys. Lett.
Volume 63, Number 1, July 2003
|
|
|---|---|---|
| Page(s) | 132 - 138 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00488-0 | |
| Published online | 01 June 2003 | |
Flux-closure-domain states and demagnetizing energy determination in sub-micron size magnetic dots
1
Laboratoire Louis Néel (CNRS, UPR5051) - BP166, 38042 Grenoble Cedex 9, France
2
DRFMC/SP2M/NM (CEA) - 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France
Corresponding author: pju@zurich.ibm.com
Received:
21
November
2002
Accepted:
28
April
2003
We used single-crystalline 
dots self-assembled under
UHV as a model system to discuss micromagnetic properties of
sub-micron size magnetic dots and show what properties may or may
not be scaled down from macroscopic samples. Landau and diamond
states were identified by MFM and reproduced by simulations. These
states are surprisingly well reproduced by the Van den Berg model
despite the small dots' size. On the contrary, it is argued
theoretically that the usual determination procedure of
demagnetizing factors Ni's using initial susceptibility
or the over-loop area underestimates the real values of
Ni's in sub-micron size dots. This point is confirmed
both experimentally and in simulations.
PACS: 75.75.+a – Magnetic properties of nanostructures / 75.70.Kw – Domain structure (including magnetic bubbles)
© EDP Sciences, 2003
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