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Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays

Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays
Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays
We fabricated a perpendicularly magnetized bit pattern media using a hexagonally close-packed auto-assembled anodic alumina template with 100 nm and 50 nm periods by depositing a Co/Pt multilayer to form an ordered array of ferromagnetic nanodots, so-called nanobumps. We used Hall resistance measurements and magnetic force microscopy to characterize the dot-by-dot magnetization reversal mechanism under applied field. The role of interdot exchange coupling and dipolar coupling are investigated. Then we focus on separating the various origins of switching field distribution (SFD) in this system, namely dipolar interactions, intrinsic anisotropy distribution, and template packing faults. Finally we discuss the influence of triangular dipolar frustrations on the energy stability of demagnetized and half-switched states based on an Ising model, including local exchange coupling. The impact of SFD and lattice defects lines between misoriented ordered domains on the magnetic configurations is studied in detail.
1550-235X
Hauet, T.
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Piraux, L.
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Srivastava, S.K.
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Antohe, V.A.
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Lacour, D.
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Hehn, M.
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Montaigne, F.
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Schwenk, J.
05b81149-be55-419d-921b-6950c5285c79
Marioni, M.A.
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Hug, H.J.
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Hovorka, O.
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Berger, A.
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Mangin, S.
66998341-0714-444a-886e-974ba465a5ff
Abreu Araujo, F.
1b988005-dea3-4756-9771-18df6bdcc17d
Hauet, T.
cf1c15a2-9ba7-4f3c-9d9e-95183eb08f07
Piraux, L.
92c4d8a8-d334-4281-9005-674cc0d1efb7
Srivastava, S.K.
bee18952-28d0-4471-aabc-6f91894005a0
Antohe, V.A.
8aa9c9e0-c8cc-4293-9576-2e9b01d3c695
Lacour, D.
b863c8f6-6b50-40e1-bbe0-46bc3ced5395
Hehn, M.
ef4a212d-3725-4fe9-b9a4-8507047c5f17
Montaigne, F.
89105265-af9b-45d9-b8fa-223690a158b8
Schwenk, J.
05b81149-be55-419d-921b-6950c5285c79
Marioni, M.A.
39c29137-9913-4938-9d7f-b71a2e1b517a
Hug, H.J.
a1c2b520-3dfd-4062-9a41-a0ff9113d034
Hovorka, O.
a12bd550-ad45-4963-aa26-dd81dd1609ee
Berger, A.
4c40c340-bd0b-4ec6-af1e-fd8326110cca
Mangin, S.
66998341-0714-444a-886e-974ba465a5ff
Abreu Araujo, F.
1b988005-dea3-4756-9771-18df6bdcc17d

Hauet, T., Piraux, L., Srivastava, S.K., Antohe, V.A., Lacour, D., Hehn, M., Montaigne, F., Schwenk, J., Marioni, M.A., Hug, H.J., Hovorka, O., Berger, A., Mangin, S. and Abreu Araujo, F. (2014) Reversal mechanism, switching field distribution, and dipolar frustrations in Co/Pt bit pattern media based on auto-assembled anodic alumina hexagonal nanobump arrays. Physical Review B, 89 (174421). (doi:10.1103/PhysRevB.89.174421).

Record type: Article

Abstract

We fabricated a perpendicularly magnetized bit pattern media using a hexagonally close-packed auto-assembled anodic alumina template with 100 nm and 50 nm periods by depositing a Co/Pt multilayer to form an ordered array of ferromagnetic nanodots, so-called nanobumps. We used Hall resistance measurements and magnetic force microscopy to characterize the dot-by-dot magnetization reversal mechanism under applied field. The role of interdot exchange coupling and dipolar coupling are investigated. Then we focus on separating the various origins of switching field distribution (SFD) in this system, namely dipolar interactions, intrinsic anisotropy distribution, and template packing faults. Finally we discuss the influence of triangular dipolar frustrations on the energy stability of demagnetized and half-switched states based on an Ising model, including local exchange coupling. The impact of SFD and lattice defects lines between misoriented ordered domains on the magnetic configurations is studied in detail.

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e-pub ahead of print date: 1 May 2014
Published date: 19 May 2014
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 381833
URI: http://eprints.soton.ac.uk/id/eprint/381833
ISSN: 1550-235X
PURE UUID: 5fd1fe59-5914-4543-b8ed-f71c16f1e01d
ORCID for O. Hovorka: ORCID iD orcid.org/0000-0002-6707-4325

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Date deposited: 30 Sep 2015 16:05
Last modified: 18 Feb 2021 17:22

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Contributors

Author: T. Hauet
Author: L. Piraux
Author: S.K. Srivastava
Author: V.A. Antohe
Author: D. Lacour
Author: M. Hehn
Author: F. Montaigne
Author: J. Schwenk
Author: M.A. Marioni
Author: H.J. Hug
Author: O. Hovorka ORCID iD
Author: A. Berger
Author: S. Mangin
Author: F. Abreu Araujo

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