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Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films

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arxiv 1602.00821 v1 pith:G2NYZCO2 submitted 2016-02-02 cond-mat.mtrl-sci cond-mat.str-el

K. Shimamoto , Y. W. Windsor , Y. Hu , M. Ramakrishnan , A. Alberca , E. M. Bothschafter , L. Rettig , Th. Lippert
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U. Staub C. W. Schneider
This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.str-el
keywords homno3propertiesalongmultiferroica-axisferroelectricfilmfilms
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Multiferroic properties of orthorhombic HoMnO3 (Pbnm space group) are significantly modified by epitaxial compressive strain along the a-axis. We are able to focus on the effect of strain solely along the a-axis by using an YAlO3 (010) substrate, which has only a small lattice mismatch with HoMnO3 along the other in-plane direction (the c-axis). Multiferroic properties of strained and relaxed HoMnO3 thin films are compared with those reported for bulk, and are found to differ widely. A relaxed film exhibits bulk-like properties such as a ferroelectric transition temperature of 25 K and an incommensurate antiferromagnetic order below 39 K, with an ordering wave vector of (0 qb 0) with qb ~ 0.41 at 10 K. A strained film becomes ferroelectric already at 37.5 K and has an incommensurate magnetic order with qb ~ 0.49 at 10 K.

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