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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 24: Magnetic Thin Films III

MA 24.5: Talk

Thursday, March 30, 2006, 11:15–11:30, HSZ 03

Structure and magnetism of epitaxial HoMnO3 films grown by pulsed laser deposition — •J.-W. Kim, K. Dörr, K. Nenkov, and L. Schultz — IFW-Dresden, PB 270116, 01171 Dresden

Hexagonal HoMnO3 is one of the most studied multiferroic materials. It is ferroelectric below Curie temperature of TC 860K and antiferromagnetic below Néel temperature of TN 76K. Some experiments have been done with HoMnO3 bulk crystals to reveal strong magneto-electric coupling, even switching to ferromagnetic order of Ho3+ spins by an applied electric field [1]. To our knowledge, no epitaxial HoMnO3 film has been made so far.

We have tried to grow epitaxial hexagonal HoMnO3 films by pulsed laser deposition on Y-stabilized ZrO2 (111) substrates. The optimum deposition temperature was 850oC and oxygen pressure was 1x10−1mbar. We found that lower oxygen pressure disturbs the proper hexagonal phase growth. A beautiful crystallinity of untwined, epitaxially grown HoMnO3 films was found by X-ray diffraction and pole figure measurement. Low temperature SQUID measurements (down to 1.7K) show some magnetic anomalies in dependence on temperature and applied magnetic field below 6K. These might be related to Ho3+ spin ordering and/or reorientation.

The author, J.-W. Kim, thanks to Deutscher Akademischer Austausch Dienst(DAAD) for a fellowship.

[1] Th. Lottermoser, Nature 430 (2004), 541-544

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