Effect of shape on magnetic response for slotted Co nanorings

Nipun Agarwal; David Smith; Martha McCartney

doi:10.1063/1.2757717

Effect of shape on magnetic response for slotted Co nanorings

Nipun Agarwal, David Smith, Martha McCartney

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

11 Scopus citations

Abstract

Remanent states and magnetization reversal for slotted Co nanorings have been investigated using Lorentz microscopy and off-axis electron holography. The 30-nm -thick Co slotted rings were patterned individually and in arrays using electron-beam lithography and lift-off. Different combinations of ring sizes, ring widths, slot angles, and interelement distances were studied using orthogonal applied field directions (perpendicular and parallel to the slot direction). Typical outer diameters (ODs) were in the range of 300-650 nm with slot angles (α) from 30° to 180°. Single-vortex, double-vortex, and flux-closure states without any vortex were found to be the most common remanent configurations. The nanorings showed considerable flux leakage near the slotted region for some size and shape combinations. Slotted Co nanorings with small OD (300 nm or less) and moderate slot angles (α=30°) would be strong candidate shapes for future patterned media applications.

Original language	English (US)
Article number	023911
Journal	Journal of Applied Physics
Volume	102
Issue number	2
DOIs	https://doi.org/10.1063/1.2757717
State	Published - 2007

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.2757717

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title = "Effect of shape on magnetic response for slotted Co nanorings",

abstract = "Remanent states and magnetization reversal for slotted Co nanorings have been investigated using Lorentz microscopy and off-axis electron holography. The 30-nm -thick Co slotted rings were patterned individually and in arrays using electron-beam lithography and lift-off. Different combinations of ring sizes, ring widths, slot angles, and interelement distances were studied using orthogonal applied field directions (perpendicular and parallel to the slot direction). Typical outer diameters (ODs) were in the range of 300-650 nm with slot angles (α) from 30° to 180°. Single-vortex, double-vortex, and flux-closure states without any vortex were found to be the most common remanent configurations. The nanorings showed considerable flux leakage near the slotted region for some size and shape combinations. Slotted Co nanorings with small OD (300 nm or less) and moderate slot angles (α=30°) would be strong candidate shapes for future patterned media applications.",

author = "Nipun Agarwal and David Smith and Martha McCartney",

note = "Funding Information: This work was supported by U.S. Department of Energy under Grant No. DE-FG02-04ER46168. We acknowledge use of facilities in the John M. Cowley Center for High Resolution Electron Microscopy and the Center for Solid State Electronics Research at Arizona State University.",

year = "2007",

doi = "10.1063/1.2757717",

language = "English (US)",

volume = "102",

journal = "Journal of Applied Physics",

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T1 - Effect of shape on magnetic response for slotted Co nanorings

AU - Agarwal, Nipun

AU - Smith, David

AU - McCartney, Martha

N1 - Funding Information: This work was supported by U.S. Department of Energy under Grant No. DE-FG02-04ER46168. We acknowledge use of facilities in the John M. Cowley Center for High Resolution Electron Microscopy and the Center for Solid State Electronics Research at Arizona State University.

PY - 2007

Y1 - 2007

N2 - Remanent states and magnetization reversal for slotted Co nanorings have been investigated using Lorentz microscopy and off-axis electron holography. The 30-nm -thick Co slotted rings were patterned individually and in arrays using electron-beam lithography and lift-off. Different combinations of ring sizes, ring widths, slot angles, and interelement distances were studied using orthogonal applied field directions (perpendicular and parallel to the slot direction). Typical outer diameters (ODs) were in the range of 300-650 nm with slot angles (α) from 30° to 180°. Single-vortex, double-vortex, and flux-closure states without any vortex were found to be the most common remanent configurations. The nanorings showed considerable flux leakage near the slotted region for some size and shape combinations. Slotted Co nanorings with small OD (300 nm or less) and moderate slot angles (α=30°) would be strong candidate shapes for future patterned media applications.

AB - Remanent states and magnetization reversal for slotted Co nanorings have been investigated using Lorentz microscopy and off-axis electron holography. The 30-nm -thick Co slotted rings were patterned individually and in arrays using electron-beam lithography and lift-off. Different combinations of ring sizes, ring widths, slot angles, and interelement distances were studied using orthogonal applied field directions (perpendicular and parallel to the slot direction). Typical outer diameters (ODs) were in the range of 300-650 nm with slot angles (α) from 30° to 180°. Single-vortex, double-vortex, and flux-closure states without any vortex were found to be the most common remanent configurations. The nanorings showed considerable flux leakage near the slotted region for some size and shape combinations. Slotted Co nanorings with small OD (300 nm or less) and moderate slot angles (α=30°) would be strong candidate shapes for future patterned media applications.

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Effect of shape on magnetic response for slotted Co nanorings

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