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 |
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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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.2975373 |