Abstract
Orthorhombic HoMnO3 thin films of thickness 80 nm were grown epitaxially on Nb-doped SrTiO3(111) substrates using pulsed laser deposition. Magnetization and dielectric constant measurements reveal that antiferromagnetic Mn3+ spin ordering occurs at approximately 40 K while Ho3+ ordering does at about 13 K. The films show sizable magnetodielectric effects (MDE) below 25 K and, in particular, they manifest a large directional anisotropy in the MDE, that is, the MDE depends sensitively on the relative direction of an external magnetic field with respect to the film normal.
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