Magneto-Electric Control of Surface Anisotropy and Nucleation Modes in L10-CoPt Thin Films

Priyanka Manchanda, Pankaj Kumar, Hans Fangohr, David J Sellmyer, Arti Kashyap, Ralph Skomski

Research output: Contribution to journalArticle

Abstract

The interplay between electric field-controlled surface magnetic anisotropy and micromagnetic nucleation modes for L10-CoPt thin films 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 the lowest order, the coercivity reduction is independent of the total film thickness. This counterintuitive feature can potentially be exploited in magneto-electric switching devices.

Original languageEnglish (US)
Article number6907952
JournalIEEE Magnetics Letters
Volume5
DOIs
StatePublished - Jan 1 2014

Fingerprint

Anisotropy
Nucleation
Coercive force
Thin films
Electric fields
Magnetic anisotropy
Fermi level
Electron energy levels
Film thickness
Nanostructures

Keywords

  • Magneto-electronics
  • thin-films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Magneto-Electric Control of Surface Anisotropy and Nucleation Modes in L10-CoPt Thin Films. / Manchanda, Priyanka; Kumar, Pankaj; Fangohr, Hans; Sellmyer, David J; Kashyap, Arti; Skomski, Ralph.

In: IEEE Magnetics Letters, Vol. 5, 6907952, 01.01.2014.

Research output: Contribution to journalArticle

Manchanda, Priyanka ; Kumar, Pankaj ; Fangohr, Hans ; Sellmyer, David J ; Kashyap, Arti ; Skomski, Ralph. / Magneto-Electric Control of Surface Anisotropy and Nucleation Modes in L10-CoPt Thin Films. In: IEEE Magnetics Letters. 2014 ; Vol. 5.
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