Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 20: Multiferroics

MA 20.16: Talk

Wednesday, February 27, 2008, 18:00–18:15, EB 202

Superconducting quantum interference device (SQUID) setup for magnetoelectric measurements — •Pavel Borisov, Andreas Hochstrat, Vladimir V. Shvartsman, and Wolfgang Kleemann — Angewandte Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany

The magnetoelectric (ME) effect in its original sense refers to the intrinsic property of some material to react on an electric field by establishing a magnetic moment, and vice versa, to generate an electric polarization by applying a magnetic field. The best investigated ME material is Cr₂O₃, where Astrov measured the linear ME effect for the first time [1]. In Astrov’s setup, the magnetic ac response signal, which was induced by an external electric field, was detected. Our method of the ME measurements is mainly based on Astrov’s approach, but at the same time takes advantage of modern SQUID magnetometry [2]. We modified a commercial SQUID setup (MPMS 5S from Quantum Design), equipped with a magnetic ac susceptibility option, for measurements of the linear ME effect and tested it on a Cr₂O₃(111) single crystal. The results are in excellent agreement with previously reported data. The main advantage is the high sensitivity of the SQUID magnetometer combined with lock-in measuring technique. In addition, investigation of field-induced and higher order ME effects is possible.

[1] D. N. Astrov, Sov. Phys. JETP 11, 780 (1960); 13, 729 (1961)

[2] P. Borisov et al., Rev. Sci. Instr. 78, 106105 (2007)