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Vortex structure in magnetic nanodots: Dipolar interaction, mobile spin model, phase transition and melting.

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Title: Vortex structure in magnetic nanodots: Dipolar interaction, mobile spin model, phase transition and melting.
Authors: Bailly-Reyre, Aurélien1 (AUTHOR) abaillyr@lpnhe.in2p3.fr, Diep, H.T.1,2 (AUTHOR) diep@cyu.fr
Source: Journal of Magnetism & Magnetic Materials. Jun2021, Vol. 528, pN.PAG-N.PAG. 1p.
Subjects: Magnetic structure, Phase transitions, Spheromaks, Spin exchange, Melting, Magnetic anisotropy
Abstract: • Dipolar interaction causes the vortex magnetic structure in nanodots. • Non-zero perpendicular magnetization at the dot center may have interesting applications. • Mobility of spins causes the melting of nanodots layer by layer. • Phase transition is shown as a function of spin concentration. We study in this article properties of a nanodot embedded in a support by Monte Carlo simulation. The nanodot is a piece of simple cubic lattice where each site is occupied by a mobile Heisenberg spin which can move from one lattice site to another under the effect of the temperature and its interaction with neighbors. We take into account a short-range exchange interaction between spins and a long-range dipolar interaction. We show that the ground-state configuration is a vortex around the dot central axis: the spins on the dot boundary lie in the xy plane but go out of plane with a net perpendicular magnetization at the dot center. Possible applications are discussed. Finite-temperature properties are studied. We show the characteristics of the surface melting and determine the energy, the diffusion coefficient and the layer magnetizations as functions of temperature. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. 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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Header DbId: egs
DbLabel: Engineering Source
An: 149365180
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Vortex structure in magnetic nanodots: Dipolar interaction, mobile spin model, phase transition and melting.
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  Data: <searchLink fieldCode="AR" term="%22Bailly-Reyre%2C+Aurélien%22">Bailly-Reyre, Aurélien</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> abaillyr@lpnhe.in2p3.fr</i><br /><searchLink fieldCode="AR" term="%22Diep%2C+H%2ET%2E%22">Diep, H.T.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> diep@cyu.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Jun2021, Vol. 528, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+structure%22">Magnetic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Spheromaks%22">Spheromaks</searchLink><br /><searchLink fieldCode="DE" term="%22Spin+exchange%22">Spin exchange</searchLink><br /><searchLink fieldCode="DE" term="%22Melting%22">Melting</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+anisotropy%22">Magnetic anisotropy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Dipolar interaction causes the vortex magnetic structure in nanodots. • Non-zero perpendicular magnetization at the dot center may have interesting applications. • Mobility of spins causes the melting of nanodots layer by layer. • Phase transition is shown as a function of spin concentration. We study in this article properties of a nanodot embedded in a support by Monte Carlo simulation. The nanodot is a piece of simple cubic lattice where each site is occupied by a mobile Heisenberg spin which can move from one lattice site to another under the effect of the temperature and its interaction with neighbors. We take into account a short-range exchange interaction between spins and a long-range dipolar interaction. We show that the ground-state configuration is a vortex around the dot central axis: the spins on the dot boundary lie in the xy plane but go out of plane with a net perpendicular magnetization at the dot center. Possible applications are discussed. Finite-temperature properties are studied. We show the characteristics of the surface melting and determine the energy, the diffusion coefficient and the layer magnetizations as functions of temperature. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. 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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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jmmm.2021.167813
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Magnetic structure
        Type: general
      – SubjectFull: Phase transitions
        Type: general
      – SubjectFull: Spheromaks
        Type: general
      – SubjectFull: Spin exchange
        Type: general
      – SubjectFull: Melting
        Type: general
      – SubjectFull: Magnetic anisotropy
        Type: general
    Titles:
      – TitleFull: Vortex structure in magnetic nanodots: Dipolar interaction, mobile spin model, phase transition and melting.
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            NameFull: Bailly-Reyre, Aurélien
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            NameFull: Diep, H.T.
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            – D: 15
              M: 06
              Text: Jun2021
              Type: published
              Y: 2021
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              Value: 528
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            – TitleFull: Journal of Magnetism & Magnetic Materials
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