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Magnetoelectric control of surface anisotropy and nucleation modes in L10-CoPt thin films

Magnetoelectric control of surface anisotropy and nucleation modes in L10-CoPt thin films
Magnetoelectric control of surface anisotropy and nucleation modes in L10-CoPt thin films
The interplay between electric field controlled surface magnetic anisotropy and micromagnetic nucleation modes for L10-CoPt thin-film is investigated with density-functional and micromagnetic model calculations. The electric field redistributes electron states near the Fermi level, which has a fairly strong effect on the surface anisotropy, but due to inversion symmetry, the net anisotropy of the films with odd numbers of layers remains unchanged. By contrast, the micromagnetic nucleation mode is spatially asymmetric even for symmetric thin-films with odd numbers of layers. This leads to a reduction of the nucleation field (coercivity) and — for suitably chosen nanostructures — to substantial changes in the hysteretic behavior. In lowest order, the coercivity reduction is independent of the total film thickness. This counter-intuitive feature can potentially be exploited in magnetoelectric switching devices.
1949-307X
Manchanda, Priyanka
76025cc3-da2b-4808-8c5f-b5e1f643f836
Kumar, Pankaj
f82a343d-bad1-4042-a036-8d146ab28273
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Sellmyer, David J.
fb636ac8-7641-4cdd-9100-fd1097ade41c
Kashyap, Arti
56d3c1e4-d2ac-4686-a37e-843df4affe0f
Skomski, Ralph
4da33ab5-f2f6-423d-9e9e-2cf720008d3a
Manchanda, Priyanka
76025cc3-da2b-4808-8c5f-b5e1f643f836
Kumar, Pankaj
f82a343d-bad1-4042-a036-8d146ab28273
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Sellmyer, David J.
fb636ac8-7641-4cdd-9100-fd1097ade41c
Kashyap, Arti
56d3c1e4-d2ac-4686-a37e-843df4affe0f
Skomski, Ralph
4da33ab5-f2f6-423d-9e9e-2cf720008d3a

Manchanda, Priyanka, Kumar, Pankaj, Fangohr, Hans, Sellmyer, David J., Kashyap, Arti and Skomski, Ralph (2014) Magnetoelectric control of surface anisotropy and nucleation modes in L10-CoPt thin films. IEEE Magnetics Letters, 5. (doi:10.1109/LMAG.2014.2360159).

Record type: Article

Abstract

The interplay between electric field controlled surface magnetic anisotropy and micromagnetic nucleation modes for L10-CoPt thin-film is investigated with density-functional and micromagnetic model calculations. The electric field redistributes electron states near the Fermi level, which has a fairly strong effect on the surface anisotropy, but due to inversion symmetry, the net anisotropy of the films with odd numbers of layers remains unchanged. By contrast, the micromagnetic nucleation mode is spatially asymmetric even for symmetric thin-films with odd numbers of layers. This leads to a reduction of the nucleation field (coercivity) and — for suitably chosen nanostructures — to substantial changes in the hysteretic behavior. In lowest order, the coercivity reduction is independent of the total film thickness. This counter-intuitive feature can potentially be exploited in magnetoelectric switching devices.

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Manchanda-etal-IEEE-MagLett-5-2500104-2014.pdf - Accepted Manuscript
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Published date: 23 September 2014
Organisations: Computational Engineering & Design Group

Identifiers

Local EPrints ID: 370294
URI: https://eprints.soton.ac.uk/id/eprint/370294
ISSN: 1949-307X
PURE UUID: 5ad6cfbc-6824-43c7-bd9a-c938c3c72d66

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Date deposited: 28 Oct 2014 12:46
Last modified: 29 Nov 2018 17:32

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