Atomically smooth and single crystalline MnTiO 3 thin filmswith a ferrotoroidic structure

We report the epitaxial growth and magnetic properties of MnTiO 3 thin films with an ilmenite structure. Although the lattice mismatch with sapphire substrates was as large as 8.0%, highly crystalline films with atomically flat surfaces were grown by using pulsed laser deposition. X-ray diffraction...

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Veröffentlicht in:Applied physics letters 2008-08, Vol.93 (7), p.072507-072507-3
Hauptverfasser: Toyosaki, H., Kawasaki, M., Tokura, Y.
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Zusammenfassung:We report the epitaxial growth and magnetic properties of MnTiO 3 thin films with an ilmenite structure. Although the lattice mismatch with sapphire substrates was as large as 8.0%, highly crystalline films with atomically flat surfaces were grown by using pulsed laser deposition. X-ray diffraction and transmission electron microscopy showed that the optimized film had almost a single crystalline structure with totally relaxed lattice parameters, inducing periodic misfit dislocations at the film/substrate interface. The magnetization curve showed an abrupt increase due to spin flopping when the magnetic field along the c -axis exceeded the critical magnetic field ( μ 0 H c ∼ 6   T ) . Due to the spin flopping, we concluded that MnTiO 3 had a ferrotoroidic structure and, thus, was magnetoelectrically active.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2975373