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
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Prof. Dr. Jamal Berakdar ⇒
jamal.berakdar@physik.uni-halle.de phone: +49 (0) 345/55 28530 fax: +49 (0) 345/55 27391 |
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Prof. Dr. Georg Woltersdorf ⇒
georg.woltersdorf@physik.uni-halle.de phone: +49 (0) 345/55 25300 fax: +49 (0) 345/55 27221 |
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