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arXiv · 1602.00821

Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films

K. Shimamoto·Y. W. Windsor·Y. Hu·M. Ramakrishnan·A. Alberca·E. M. Bothschafter·L. Rettig·Th. Lippert·U. Staub·C. W. Schneider
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Abstract

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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K. Shimamoto, Y. W. Windsor, Y. Hu, M. Ramakrishnan, A. Alberca, E. M. Bothschafter, L. Rettig, Th. Lippert, U. Staub, C. W. Schneider. 2016-02-02. Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films. https://doi.org/10.1063/1.4944460

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