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Article Dans Une Revue Physical Review Materials Année : 2019

Enhancement of magnetic properties in compressively strained PrVO 3 thin films

Résumé

Strain engineering is an important issue in oxides thin lms to explore new functionalities. Here, a series of high quality epitaxial PrVO 3 (PVO) thin lms were grown, by Pulsed Laser Deposition (PLD) technique, as a function of thickness on (La,Sr)(Al,Ta)O 3 (100) [LSAT (100)] and LaAlO 3 (100) [LAO (100)] substrates with nominal lattice mismatch of-0.8 % and-2.9 %, respectively. The X-ray diraction revealed a constant out-of-plane lattice parameter of PVO/LSAT with increase in lm thickness, while a rather continuous decrease for PVO/LAO lms. Whereas thicker PVO lms show a ferromagnetic-like behavior, at low thickness a surprising decrease of coercivity (H c) and increase of saturation magnetization (M s) is observed. This behavior is described using a classical model of dead layer which possesses a strong paramagnetic susceptibility. It is also shown how capping of PVO lm can aid in recovering the pure magnetic properties of PVO, by diminishing the contribution from dead layer. Finally, the Néel temperature (T N) is examined as a function of lm thickness, and found to vary in the range of 25 K and 30 K for LSAT and LAO, respectively. These results pave the way for the use of vanadate in thin lm devices.
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Dates et versions

hal-03014252 , version 1 (20-11-2020)

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D. Kumar, A. Fouchet, A. David, A. Cheikh, T. Suraj, et al.. Enhancement of magnetic properties in compressively strained PrVO 3 thin films. Physical Review Materials, 2019, 3 (12), pp.124413. ⟨10.1103/PhysRevMaterials.3.124413⟩. ⟨hal-03014252⟩
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