@article{bbabe17c985d4370b8c2f1b24e938a96,
title = "Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots",
abstract = "The magnetization reversal processes in Fe20 Ni80 dot arrays have been studied both experimentally and theoretically. The circular-shaped dots with thickness of 60 nm and variable diameters of 0.2-0.8 μm were fabricated by using electron-beam lithography and lift-off technique. A size dependent vortex nucleation, annihilation and initial susceptibility were determined from magneto-optical hysteresis loops. With increasing dot diameter the nucleation and annihilation fields decrease, whereas the initial susceptibility exhibits a linear increase. The experimental data were compared to the results of analytical calculations taking into account magnetostatic interactions, exchange and Zeeman energies for a planar arty of magnetically soft circular dots.",
keywords = "Circular dots, Magnetic vortex, Permalloy, Vortex nucleation and annihilation",
author = "V. Novosad and Guslienko, {K. Yu} and H. Shima and Y. Otani and K. Fukamichi and N. Kikuchi and O. Kitakami and Y. Shimada",
note = "Funding Information: Manuscript received October 9, 2000. This work was supported in part by Korea Institute for Advanced Study, RFTF of Japan Society for the Promotion of Science, and the Grant-in-Aid for Scientific Research from the Ministry of Education, Science, and Culture in Japan. V. Novosad, Y. Otani, H. Shima, and K. Fukamichi are with the Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan (e-mail: otani@material.tohoku.ac.jp). K. Yu. Guslienko is with the School of Physics, Korea Institute for Advanced Study, Seoul 130-012, South Korea (e-mail: kgus@kias.re.kr). N. Kikuchi, O. Kitakami, and Y. Shimada are with the Research Institute for Scientific Measurements, Tohoku University, Aoba-ku, Sendai 980-8577, Japan (e-mail: simayuta@rism.tohoku.ac.jp). Publisher Item Identifier S 0018-9464(01)07256-9.; 8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) ; Conference date: 07-01-2001 Through 11-01-2001",
year = "2001",
month = jul,
doi = "10.1109/20.951062",
language = "English",
volume = "37",
pages = "2088--2090",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4 I",
}