Regensburg 2013 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 22: Poster II

DF 22.16: Poster

Friday, March 15, 2013, 10:30–13:30, Poster D

Magnetic Properties of the Fe-GaAs(110) Interface with ultrathin films investigated by In-Situ MOKE Measurements — Tim Iffländer, Martin Wenderoth, •Steffen Rolf-Pissarczyk, Steffen Weikert, Lars Winking, and Rainer G. Ulbrich — IV. Phys. Inst., Georg-August-Universität Göttingen

We have investigated the magnetic properties of ultrathin Fe Films epitaxially grown on the GaAs(110) and the InAs(110) surface. The films were deposited in a two-step process at 130 K to avoid any interface mixing. In-situ STM and LEED measurements proved an abrupt interface and an epitaxial growth of the Fe-GaAs system. In-situ magneto-optical kerr effect (MOKE) measurements at RT were conducted for different longitudinal, transversal and polar orientations of the applied magnetic field with respect to the (110) surface of the GaAs sample. For the 2-3 ML thickness regime deposited at low-temperature an interchange of the easy-axis from the [110] to the [001]-axis was in contrast to at RT grown Fe films observed. Moreover, we found a magnetic anisotropy along the [001]-axis which is connected to a polar magnetization component.

In addition, several MOKE hysteresis loops for different magnetic field directions and a fixed laser beam were taken to distinguish easy-axis from hard-axis behaviour. Hence we were able to show that in comparison to the in-plane [001]-axis the out-of plane direction is not a magnetic easy-axis. These results indicate a strong spin-orbit coupling in these compount systems. This work was supported by the Deutsche Forschungsgemeinschaft SFB 602 TP A7 and SPP 1285.