Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots

V. Novosad; K. Yu Guslienko; H. Shima; Y. Otani; K. Fukamichi; N. Kikuchi; O. Kitakami; Y. Shimada

doi:10.1109/20.951062

Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots

V. Novosad, K. Yu Guslienko, H. Shima, Y. Otani, K. Fukamichi, N. Kikuchi, O. Kitakami, Y. Shimada

Division of Inorganic Material Research

Research output: Contribution to journal › Conference article › peer-review

51 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2088-2090
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	37
Issue number	4 I
DOIs	https://doi.org/10.1109/20.951062
Publication status	Published - 2001 Jul
Event	8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States Duration: 2001 Jan 7 → 2001 Jan 11

Keywords

Circular dots
Magnetic vortex
Permalloy
Vortex nucleation and annihilation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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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. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.; 8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) ; Conference date: 07-01-2001 Through 11-01-2001",

year = "2001",

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TY - JOUR

T1 - Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots

AU - Novosad, V.

AU - Guslienko, K. Yu

AU - Shima, H.

AU - Otani, Y.

AU - Fukamichi, K.

AU - Kikuchi, N.

AU - Kitakami, O.

AU - Shimada, Y.

N1 - 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. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2001/7

Y1 - 2001/7

N2 - 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.

AB - 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.

KW - Circular dots

KW - Magnetic vortex

KW - Permalloy

KW - Vortex nucleation and annihilation

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EP - 2090

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JF - IEEE Transactions on Magnetics

SN - 0018-9464

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T2 - 8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag)

Y2 - 7 January 2001 through 11 January 2001

ER -

Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots

Abstract

Keywords

ASJC Scopus subject areas

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