Dresden 2006 – wissenschaftliches Programm

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PV: Plenarvorträge

PV X

PV X: Preisträgervortrag

Mittwoch, 29. März 2006, 11:00–11:45, HSZ 01

Magnetoelectric correlations in multiferroics revealed by nonlinear optics — •Manfred Fiebig — Max-Born-Institut, Max-Born-Straße 2a, 12489 Berlin — Träger des Walter-Schottky-Preises

Recently an enormous interest in multiferroics – compounds uniting two or more forms of long-range ordering in one phase – is observed. The coexistence of magnetic and electric ordering is a particularly promising route to devices with novel “magnetoelectric” (ME) functionalities. Two topics dominate contemporary research: (i) forms of ME coupling between the coexisting ordered states; (ii) ways for ME phase control, like switching the magnetic order by an electric field. I will introduce optical second harmonic generation (SHG) for probing ME correlations in multiferroics. SHG is described by P(2ω)=ε₀ χ  E(ω)E(ω) with E(ω) as incident light wave and P(2ω) as source of a frequency doubled outgoing wave. Since χ includes magnetic as well as electric contributions, SHG is an ideal tool for studying the magnetic and electric structure with the same setup. Various ME correlations in multiferroic RMnO₃ (R = Sc, Y, In, Ho–Lu) will be discussed. These include coupling of magnetic and electric domain walls, induction of ferromagnetism by an electric field, and ultrafast interaction between the ferroelectric and the magnetic subsystems.