Observation of magnetic vortex pairs at room temperature in a planar alpha-Fe2O3/Co heterostructure. Chmiel, F. P., Price, N. W., Johnson, R. D., Lamirand, A. D., Schad, J., van der Laan, G., Harris, D. T., Irwin, J., Rzchowski, M. S., Eom, C., & Radaelli, P. G. NATURE MATERIALS, 17(7):581+, JUL, 2018. doi abstract bibtex Vortices, occurring whenever a flow field `whirls' around a one-dimensional core, are among the simplest topological structures, ubiquitous to many branches of physics. In the crystalline state, vortex formation is rare, since it is generally hampered by long-range interactions: in ferroic materials (ferromagnetic and ferroelectric), vortices are observed only when the effects of the dipole-dipole interaction are modified by confinement at the nanoscale(1-3), or when the parameter associated with the vorticity does not couple directly with strain(4). Here, we observe an unprecedented form of vortices in antiferromagnetic haematite (alpha-Fe2O3) epitaxial films, in which the primary whirling parameter is the staggered magnetization. Remarkably, ferromagnetic topological objects with the same vorticity and winding number as the alpha-Fe2O3 vortices are imprinted onto an ultra-thin Co ferromagnetic over-layer by interfacial exchange. Our data suggest that the ferromagnetic vortices may be merons (half-skyrmions, carrying an out-of plane core magnetization), and indicate that the vortex/meron pairs can be manipulated by the application of an in-plane magnetic field, giving rise to large-scale vortex-antivortex annihilation.
@article{ ISI:000436341400010,
Author = {Chmiel, F. P. and Price, N. Waterfield and Johnson, R. D. and Lamirand,
A. D. and Schad, J. and van der Laan, G. and Harris, D. T. and Irwin, J.
and Rzchowski, M. S. and Eom, C-B and Radaelli, P. G.},
Title = {{Observation of magnetic vortex pairs at room temperature in a planar
alpha-Fe2O3/Co heterostructure}},
Journal = {{NATURE MATERIALS}},
Year = {{2018}},
Volume = {{17}},
Number = {{7}},
Pages = {{581+}},
Month = {{JUL}},
Abstract = {{Vortices, occurring whenever a flow field `whirls' around a
one-dimensional core, are among the simplest topological structures,
ubiquitous to many branches of physics. In the crystalline state, vortex
formation is rare, since it is generally hampered by long-range
interactions: in ferroic materials (ferromagnetic and ferroelectric),
vortices are observed only when the effects of the dipole-dipole
interaction are modified by confinement at the nanoscale(1-3), or when
the parameter associated with the vorticity does not couple directly
with strain(4). Here, we observe an unprecedented form of vortices in
antiferromagnetic haematite (alpha-Fe2O3) epitaxial films, in which the
primary whirling parameter is the staggered magnetization. Remarkably,
ferromagnetic topological objects with the same vorticity and winding
number as the alpha-Fe2O3 vortices are imprinted onto an ultra-thin Co
ferromagnetic over-layer by interfacial exchange. Our data suggest that
the ferromagnetic vortices may be merons (half-skyrmions, carrying an
out-of plane core magnetization), and indicate that the vortex/meron
pairs can be manipulated by the application of an in-plane magnetic
field, giving rise to large-scale vortex-antivortex annihilation.}},
DOI = {{10.1038/s41563-018-0101-x}},
ISSN = {{1476-1122}},
EISSN = {{1476-4660}},
ORCID-Numbers = {{van der Laan, Gerrit/0000-0001-6852-2495
Lamirand, Anne/0000-0003-3016-1377
Harris, David/0000-0002-1150-8702
Chmiel, Francis/0000-0003-0674-8098}},
Unique-ID = {{ISI:000436341400010}},
}
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In the crystalline state, vortex formation is rare, since it is generally hampered by long-range interactions: in ferroic materials (ferromagnetic and ferroelectric), vortices are observed only when the effects of the dipole-dipole interaction are modified by confinement at the nanoscale(1-3), or when the parameter associated with the vorticity does not couple directly with strain(4). Here, we observe an unprecedented form of vortices in antiferromagnetic haematite (alpha-Fe2O3) epitaxial films, in which the primary whirling parameter is the staggered magnetization. Remarkably, ferromagnetic topological objects with the same vorticity and winding number as the alpha-Fe2O3 vortices are imprinted onto an ultra-thin Co ferromagnetic over-layer by interfacial exchange. 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G.},\nTitle = {{Observation of magnetic vortex pairs at room temperature in a planar\n alpha-Fe2O3/Co heterostructure}},\nJournal = {{NATURE MATERIALS}},\nYear = {{2018}},\nVolume = {{17}},\nNumber = {{7}},\nPages = {{581+}},\nMonth = {{JUL}},\nAbstract = {{Vortices, occurring whenever a flow field `whirls' around a\n one-dimensional core, are among the simplest topological structures,\n ubiquitous to many branches of physics. In the crystalline state, vortex\n formation is rare, since it is generally hampered by long-range\n interactions: in ferroic materials (ferromagnetic and ferroelectric),\n vortices are observed only when the effects of the dipole-dipole\n interaction are modified by confinement at the nanoscale(1-3), or when\n the parameter associated with the vorticity does not couple directly\n with strain(4). 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