Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.22: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Quantifying the electric field induced change of magnetic anisotropy in ultrathin Fe layers — •Mirko Ribow, Liane Brandt, and Georg Woltersdorf — Martin Luther University Halle-Wittenberg, Institute of Physics

The recent discovery of magneto-electric coupling in ultrathin ferromagnet-dielectric heterostructures has opened new ways to control the magnetic properties via electric fields. A possible application of this effect is magnetization control in ultra low power consumption spintronic devices. Here, we report on the quantitative evaluation of the electric field induced change of magnetic anisotropy (ECMA) in Au/MgO/Fe/Au(001) layers grown by molecular beam epitaxy. Fe layers in a thickness range of t = 0 - 7 monolayers were studied. In the analysis special care has been taken to exclude charge trapping effects, which can lead to an overestimation of the ECMA effect. In contrast to an expected 1/t dependence of the effect, our results demonstrate an increasing ECMA as function of thickness. This finding cannot be explained based on a modification of the electronic structure only at the surface of the Fe layer, instead it may be attributed to the electric tuning of quantum well states [1].

[1] U. Bauer et al., Phys. Rev. B., 89, 174402 (2014)