Martin Luther University Halle-Wittenberg

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B11: Multiferroic dynamics at oxide interfaces

At the interface of ferromagnet (FM) and a ferroelectrics (FE)  a on-collinear spin order on the scale of the spin-diffusion length may form. The gauge potential akin to this non-collinear  spin order leads  to a spin-orbit coupling and as such has an impact on the magnetization dynamics,  charge transport and magneto-optical properties.

In this experiment-theory project, the non-collinear spin structure generated due to the FM / FE coupling will be examined on the basis of the magneto-optical Kerr effect. The dependence of magneto-electric coupling on material properties such as the spin-diffusion length will be quantified.

Another aim is to investigate the ultrafast dynamics of FE polarization. An optical access to the FE-polarization we obtain via the phase of the light of the second harmonic (SHG).

The switching of the FE layer is achieved by means of electrical pulses. Another object is the use of high intensity THz pulses for switching the FE polarization. In bilayers the FE / FM coupling will be traced on an ultrafast time scale when switching the FE polarization via Kerr and SHG signals.

Principal Investigators

Prof. Dr. Jamal Berakdar ⇒

phone: +49 (0) 345/55 28530

fax: +49 (0) 345/55 27391

Prof. Dr. Jamal Berakdar

Prof. Dr. Jamal Berakdar

Prof. Dr. Georg Woltersdorf ⇒

phone: +49 (0) 345/55 25300

fax: +49 (0) 345/55 27221

Prof. Dr. Georg Woltersdorf

Prof. Dr. Georg Woltersdorf