Vortex formation during magnetization reversal of Co slotted nanorings

Kai He; Nipun Agarwal; David J. Smith; Martha R. McCartney

doi:10.1109/TMAG.2009.2024896

Vortex formation during magnetization reversal of Co slotted nanorings

Kai He^*, Nipun Agarwal, David J. Smith, Martha R. McCartney

^*Corresponding author for this work

NUANCE - Atomic and Nanoscale Characterization Experimental Center

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Electron holography can provide direct visualization and quantitative information about magnetization configurations, which is essential for determination of reversal mechanisms. The remanent states and switching behavior of Co slotted nanorings have been investigated using off-axis electron holography and Lorentz microscopy. The 30-nm-thick Co elements, with outer and inner diameters of 450 and 150 nm, and slot angle of 60° were lithographically patterned into 3x3 arrays. Depending on whether the external field was applied parallel or perpendicular to the slot direction, the individual elements exhibited onion or flux-closure configurations at remanence, with three-step or one-step hysteresis behavior, respectively. Vortex formation was observed during the three-step magnetization reversal, whereas abrupt reversal in the chirality of flux closure states was evident for the one-step hysteresis loop.

Original language	English (US)
Article number	5257002
Pages (from-to)	3885-3888
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	45
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2009.2024896
State	Published - Oct 1 2009

Keywords

Holography
Magnetization reversal
Three-step hysteresis loop
Vortex formation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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abstract = "Electron holography can provide direct visualization and quantitative information about magnetization configurations, which is essential for determination of reversal mechanisms. The remanent states and switching behavior of Co slotted nanorings have been investigated using off-axis electron holography and Lorentz microscopy. The 30-nm-thick Co elements, with outer and inner diameters of 450 and 150 nm, and slot angle of 60° were lithographically patterned into 3x3 arrays. Depending on whether the external field was applied parallel or perpendicular to the slot direction, the individual elements exhibited onion or flux-closure configurations at remanence, with three-step or one-step hysteresis behavior, respectively. Vortex formation was observed during the three-step magnetization reversal, whereas abrupt reversal in the chirality of flux closure states was evident for the one-step hysteresis loop.",

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AU - McCartney, Martha R.

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N2 - Electron holography can provide direct visualization and quantitative information about magnetization configurations, which is essential for determination of reversal mechanisms. The remanent states and switching behavior of Co slotted nanorings have been investigated using off-axis electron holography and Lorentz microscopy. The 30-nm-thick Co elements, with outer and inner diameters of 450 and 150 nm, and slot angle of 60° were lithographically patterned into 3x3 arrays. Depending on whether the external field was applied parallel or perpendicular to the slot direction, the individual elements exhibited onion or flux-closure configurations at remanence, with three-step or one-step hysteresis behavior, respectively. Vortex formation was observed during the three-step magnetization reversal, whereas abrupt reversal in the chirality of flux closure states was evident for the one-step hysteresis loop.

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