Magnetization states and switching in narrow-gapped ferromagnetic nanorings

Jie Li; Sheng Zhang; Chris Grigas; Rajiv Misra; Jason Bartell; Vincent H. Crespi; Peter Schiffera

doi:10.1063/1.3685590

Magnetization states and switching in narrow-gapped ferromagnetic nanorings

Jie Li, Sheng Zhang, Chris Grigas, Rajiv Misra, Jason Bartell, Vincent H. Crespi, Peter Schiffera

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

7 Scopus citations

Abstract

We study permalloy nanorings that are lithographically fabricated with narrow gaps that break the rotational symmetry of the ring while retaining the vortex ground state, using both micromagnetic simulations and magnetic force microscopy (MFM). The vortex chirality in these structures can be readily set with an in-plane magnetic field and easily probed by MFM due to the field associated with the gap, suggesting such rings for possible applications in storage technologies. We find that the gapped ring edge characteristics (i.e., edge profile and gap shape) are critical in determining the magnetization switching field, thus elucidating an essential parameter in the controls of devices that might incorporate such structures.

Original language	English (US)
Article number	012136
Journal	AIP Advances
Volume	2
Issue number	1
DOIs	https://doi.org/10.1063/1.3685590
State	Published - Mar 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1063/1.3685590

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title = "Magnetization states and switching in narrow-gapped ferromagnetic nanorings",

abstract = "We study permalloy nanorings that are lithographically fabricated with narrow gaps that break the rotational symmetry of the ring while retaining the vortex ground state, using both micromagnetic simulations and magnetic force microscopy (MFM). The vortex chirality in these structures can be readily set with an in-plane magnetic field and easily probed by MFM due to the field associated with the gap, suggesting such rings for possible applications in storage technologies. We find that the gapped ring edge characteristics (i.e., edge profile and gap shape) are critical in determining the magnetization switching field, thus elucidating an essential parameter in the controls of devices that might incorporate such structures.",

author = "Jie Li and Sheng Zhang and Chris Grigas and Rajiv Misra and Jason Bartell and Crespi, {Vincent H.} and Peter Schiffera",

note = "Funding Information: This research was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Award # DE-SC0005313, and by the Army Research Office, the National Nanotechnology Infrastructure Network and an REU Supplement to NSF grant DMR-0701582. We are grateful to Chris Leighton and Mike Erickson for assistance with the sample preparation and to them, Paul Crowell, and Paul Lammert for helpful discussions.",

year = "2012",

month = mar,

doi = "10.1063/1.3685590",

language = "English (US)",

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journal = "AIP Advances",

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T1 - Magnetization states and switching in narrow-gapped ferromagnetic nanorings

AU - Li, Jie

AU - Zhang, Sheng

AU - Grigas, Chris

AU - Misra, Rajiv

AU - Bartell, Jason

AU - Crespi, Vincent H.

AU - Schiffera, Peter

N1 - Funding Information: This research was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Award # DE-SC0005313, and by the Army Research Office, the National Nanotechnology Infrastructure Network and an REU Supplement to NSF grant DMR-0701582. We are grateful to Chris Leighton and Mike Erickson for assistance with the sample preparation and to them, Paul Crowell, and Paul Lammert for helpful discussions.

PY - 2012/3

Y1 - 2012/3

N2 - We study permalloy nanorings that are lithographically fabricated with narrow gaps that break the rotational symmetry of the ring while retaining the vortex ground state, using both micromagnetic simulations and magnetic force microscopy (MFM). The vortex chirality in these structures can be readily set with an in-plane magnetic field and easily probed by MFM due to the field associated with the gap, suggesting such rings for possible applications in storage technologies. We find that the gapped ring edge characteristics (i.e., edge profile and gap shape) are critical in determining the magnetization switching field, thus elucidating an essential parameter in the controls of devices that might incorporate such structures.

AB - We study permalloy nanorings that are lithographically fabricated with narrow gaps that break the rotational symmetry of the ring while retaining the vortex ground state, using both micromagnetic simulations and magnetic force microscopy (MFM). The vortex chirality in these structures can be readily set with an in-plane magnetic field and easily probed by MFM due to the field associated with the gap, suggesting such rings for possible applications in storage technologies. We find that the gapped ring edge characteristics (i.e., edge profile and gap shape) are critical in determining the magnetization switching field, thus elucidating an essential parameter in the controls of devices that might incorporate such structures.

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Magnetization states and switching in narrow-gapped ferromagnetic nanorings

Abstract

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