Micromagnetism in mesoscopic epitaxial Fe dot arrays

A. Hirohata; Y.B. Xu; L. Lopez-Diaz; H.T. Leung; M. Tselepi; S.M. Gardiner; W.Y. Lee; J.A.C. Bland; F. Rousseaux; E. Cambril; H. Launois

doi:10.1063/1.372917

Micromagnetism in mesoscopic epitaxial Fe dot arrays

A. Hirohata, Y.B. Xu, L. Lopez-Diaz, H.T. Leung, M. Tselepi, S.M. Gardiner, W.Y. Lee, J.A.C. Bland, F. Rousseaux, E. Cambril, H. Launois

Electronic Engineering

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Abstract

The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 µm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 µm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to "collapse" into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy. © 2000 American Institute of Physics.

Original language	English
Pages (from-to)	7019-7021
Number of pages	2
Journal	Journal of Applied Physics
Volume	87
Issue number	9
DOIs	https://doi.org/10.1063/1.372917
Publication status	Published - 1 May 2000

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10.1063/1.372917

Cite this

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title = "Micromagnetism in mesoscopic epitaxial Fe dot arrays",

abstract = "The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 µm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 µm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to {"}collapse{"} into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy. {\textcopyright} 2000 American Institute of Physics.",

author = "A. Hirohata and Y.B. Xu and L. Lopez-Diaz and H.T. Leung and M. Tselepi and S.M. Gardiner and W.Y. Lee and J.A.C. Bland and F. Rousseaux and E. Cambril and H. Launois",

note = "{\textcopyright} 2000 American Institute of Physics. Available from the author's web site (Associated URL field).",

year = "2000",

month = may,

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doi = "10.1063/1.372917",

language = "English",

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TY - JOUR

T1 - Micromagnetism in mesoscopic epitaxial Fe dot arrays

AU - Hirohata, A.

AU - Xu, Y.B.

AU - Lopez-Diaz, L.

AU - Leung, H.T.

AU - Tselepi, M.

AU - Gardiner, S.M.

AU - Lee, W.Y.

AU - Bland, J.A.C.

AU - Rousseaux, F.

AU - Cambril, E.

AU - Launois, H.

PY - 2000/5/1

Y1 - 2000/5/1

N2 - The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 µm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 µm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to "collapse" into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy. © 2000 American Institute of Physics.

AB - The domain structures of epitaxial Fe (20 nm)/GaAs(100) circular dot arrays (diameters from 50 to 1 µm) were studied with magnetic force microscopy. A transition from a single domain to a multidomain remanent state was observed upon reducing the dot diameter beneath 10 µm in dot arrays with the separation twice the dot diameter. When the separation is reduced to half the dot diameter, the single domain states were found to "collapse" into stripe-like multidomain states due to local dipole coupling between dots. Micromagnetic simulations further suggest that for ultrathin Fe dots of less than about 2 nm thickness the diameter does not have a significant influence on the domain structures due to a dramatic reduction of the dipole energy. © 2000 American Institute of Physics.

U2 - 10.1063/1.372917

DO - 10.1063/1.372917

M3 - Article

SN - 0021-8979

VL - 87

SP - 7019

EP - 7021

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9

ER -