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Multiferroic hexagonal HoMnO3 films

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Multiferroic hexagonal HoMnO3 films

Jong-Woo Kim (Author)

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ISBN-13 (Printausgabe) 3869552263
ISBN-13 (Hard Copy) 9783869552262
ISBN-13 (eBook) 9783736932265
Language English
Page Number 108
Edition 1 Aufl.
Volume 0
Publication Place Göttingen
Place of Dissertation TU Dresden
Publication Date 2010-01-07
General Categorization Dissertation
Departments Physics
Description

The fundamental properties of hexagonal multiferric HoMnO3 films have been thoroughly investigated. The films are grown by pulsed laser deposition on Y:ZrO2(111)
substrates. High quality epitaxial HoMnO3 films of 25 – 1000 nm thickness were successfully prepared. The film properties are compared to those of single-crystals.
The magnetization measurements revealed that the films show a deviating magnetic behavior from the single-crystals in several ways. For instance, the films have a weakened antiferromagnetic Ho3+ order confirmed from magnetic susceptibility. The differences are likely to be related to the modified (mostly larger) lattice parameters of films. An approximate phase diagram in comparison with the single-crystal’s one is constructed. For multiferroicity investigations, Second Harmonic Generation (SHG; in collaboration with the group of M. Fiebig) has been employed. By SHG, the ferroelectric polar order of the films is obviously confirmed. The ferroelectric switching at room temperature could be clearly demonstrated, whereas leakage of films requires generally a more sophisticated approach.