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Periodic polarity switching of a pinned vortex core in nanodisks: subharmonic control via geometric confinement.

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Title: Periodic polarity switching of a pinned vortex core in nanodisks: subharmonic control via geometric confinement.
Authors: Silva, R L1 (AUTHOR) ricardo.l.silva@ufes.br, Silva, R C1 (AUTHOR) rodrigo.c.silva@ufes.br
Source: Journal of Physics D: Applied Physics. 2026, Vol. 59 Issue 9, p1-12. 12p.
Subjects: Spintronics, Synchronization, Nanomagnetics, Nanostructures, Magnetic control, Magnetic structure
Abstract: We demonstrate fast, reversible, and fully periodic polarity switching of vortex core pinned at a central nanohole in Permalloy and CoFe nanodisks. An oscillating current drives the core out of the defect in a zero-polarity state. Once expelled, the core acquires a finite polarity and performs a confined gyrotropic motion while remaining attracted to the hole. It is subsequently reabsorbed and reemerges with opposite polarity. The switching frequency is not arbitrary but locked to rational fractions of the drive, establishing robust subharmonic phase-locking of the vortex polarity. This defect-assisted mechanism is reproducible across materials and excitation conditions. Because the polarity oscillation is phase-locked to the external drive, the final state can be deterministically selected through timing control, offering a scalable pathway for topological state manipulation. Our findings highlight engineered core dynamics as a promising strategy for spintronic applications. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192160243
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PubType: Academic Journal
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  Data: Periodic polarity switching of a pinned vortex core in nanodisks: subharmonic control via geometric confinement.
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  Data: <searchLink fieldCode="AR" term="%22Silva%2C+R+L%22">Silva, R L</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ricardo.l.silva@ufes.br</i><br /><searchLink fieldCode="AR" term="%22Silva%2C+R+C%22">Silva, R C</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rodrigo.c.silva@ufes.br</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+D%3A+Applied+Physics%22">Journal of Physics D: Applied Physics</searchLink>. 2026, Vol. 59 Issue 9, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Spintronics%22">Spintronics</searchLink><br /><searchLink fieldCode="DE" term="%22Synchronization%22">Synchronization</searchLink><br /><searchLink fieldCode="DE" term="%22Nanomagnetics%22">Nanomagnetics</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructures%22">Nanostructures</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+control%22">Magnetic control</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+structure%22">Magnetic structure</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We demonstrate fast, reversible, and fully periodic polarity switching of vortex core pinned at a central nanohole in Permalloy and CoFe nanodisks. An oscillating current drives the core out of the defect in a zero-polarity state. Once expelled, the core acquires a finite polarity and performs a confined gyrotropic motion while remaining attracted to the hole. It is subsequently reabsorbed and reemerges with opposite polarity. The switching frequency is not arbitrary but locked to rational fractions of the drive, establishing robust subharmonic phase-locking of the vortex polarity. This defect-assisted mechanism is reproducible across materials and excitation conditions. Because the polarity oscillation is phase-locked to the external drive, the final state can be deterministically selected through timing control, offering a scalable pathway for topological state manipulation. Our findings highlight engineered core dynamics as a promising strategy for spintronic applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1088/1361-6463/ae4a37
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Spintronics
        Type: general
      – SubjectFull: Synchronization
        Type: general
      – SubjectFull: Nanomagnetics
        Type: general
      – SubjectFull: Nanostructures
        Type: general
      – SubjectFull: Magnetic control
        Type: general
      – SubjectFull: Magnetic structure
        Type: general
    Titles:
      – TitleFull: Periodic polarity switching of a pinned vortex core in nanodisks: subharmonic control via geometric confinement.
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            NameFull: Silva, R L
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            – D: 06
              M: 03
              Text: 2026
              Type: published
              Y: 2026
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              Value: 59
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              Value: 9
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            – TitleFull: Journal of Physics D: Applied Physics
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