Switching mechanisms and remanent states for nanoscale slotted Co circular elements studied by electron holography

Hao Hu, Hua Wang, Martha McCartney, David Smith

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The effect of size and shape on the remanent states and switching behavior for slotted Co disks and rings has been determined using off-axis electron holography. Both shapes have very stable and well-defined remanent states, unlike complete disks and rings with the same dimensions. Slotted disks have vortex states during switching between two single domain states, whereas slotted rings usually show rapid switching without vortex formation. The switching field range of a slotted ring, typically ∼40 Oe, is much smaller than for a complete ring, and is not dependent on the open slot angle or outer diameter. Because of the small leakage field, interelement interactions should be very small for slotted rings with small slot angles, making the shape attractive for high-density data storage applications.

Original languageEnglish (US)
Article number153401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number15
DOIs
StatePublished - 2006

Fingerprint

Electron holography
holography
rings
Vortex flow
electrons
slots
vortices
data storage
Data storage equipment
leakage

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Switching mechanisms and remanent states for nanoscale slotted Co circular elements studied by electron holography",
abstract = "The effect of size and shape on the remanent states and switching behavior for slotted Co disks and rings has been determined using off-axis electron holography. Both shapes have very stable and well-defined remanent states, unlike complete disks and rings with the same dimensions. Slotted disks have vortex states during switching between two single domain states, whereas slotted rings usually show rapid switching without vortex formation. The switching field range of a slotted ring, typically ∼40 Oe, is much smaller than for a complete ring, and is not dependent on the open slot angle or outer diameter. Because of the small leakage field, interelement interactions should be very small for slotted rings with small slot angles, making the shape attractive for high-density data storage applications.",
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AU - Hu, Hao

AU - Wang, Hua

AU - McCartney, Martha

AU - Smith, David

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N2 - The effect of size and shape on the remanent states and switching behavior for slotted Co disks and rings has been determined using off-axis electron holography. Both shapes have very stable and well-defined remanent states, unlike complete disks and rings with the same dimensions. Slotted disks have vortex states during switching between two single domain states, whereas slotted rings usually show rapid switching without vortex formation. The switching field range of a slotted ring, typically ∼40 Oe, is much smaller than for a complete ring, and is not dependent on the open slot angle or outer diameter. Because of the small leakage field, interelement interactions should be very small for slotted rings with small slot angles, making the shape attractive for high-density data storage applications.

AB - The effect of size and shape on the remanent states and switching behavior for slotted Co disks and rings has been determined using off-axis electron holography. Both shapes have very stable and well-defined remanent states, unlike complete disks and rings with the same dimensions. Slotted disks have vortex states during switching between two single domain states, whereas slotted rings usually show rapid switching without vortex formation. The switching field range of a slotted ring, typically ∼40 Oe, is much smaller than for a complete ring, and is not dependent on the open slot angle or outer diameter. Because of the small leakage field, interelement interactions should be very small for slotted rings with small slot angles, making the shape attractive for high-density data storage applications.

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