Effect of crystallinity on the magnetoresistive properties of La0.8MnO3−δ thin films grown by chemical vapor deposition
- 17 August 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 73 (7) , 999-1001
- https://doi.org/10.1063/1.122065
Abstract
We report here a study on the role of crystallinity on the magnetoresistive properties of self-doped La0.8MnO3−δ thin films. Films have been grown by a liquid-source metalorganic chemical vapor deposition technique on two different single crystals: SrTiO3 (001) and Al2O3 (012). Epitaxial films are obtained on strontium titanate and show a high magnetoresistance peak at low fields: maximum magnetoresistive effect in the vicinity of the magnetic transition temperature, and negligible 50 K below. Polycrystalline films are observed on sapphire; they exhibit a lower magnetoresistance of several percent which remains nearly constant over a wide temperature range. Two magnetoresistive regimes can be distinguished in these films: in low fields (up to 5 mT), a strong magnetoresistance is obtained with a sensitivity of 0.28%/mT at 78 K; in higher fields, the magnetoresistance is linear and lower than this obtained in epitaxial films. The role of grain boundaries on the magnetoresistive effect is discussed.Keywords
This publication has 18 references indexed in Scilit:
- Annealing effect on magnetic and electrical properties of epitaxial La0.8MnO3−δ thin films grown by chemical vapor depositionJournal of Applied Physics, 1997
- Anisotropic strains and magnetoresistance of La0.7Ca0.3MnO3Applied Physics Letters, 1997
- HTS thin films by innovative MOCVD processesJournal of Alloys and Compounds, 1997
- Dependence of giant magnetoresistance on oxygen stoichiometry and magnetization in polycrystallinePhysical Review B, 1995
- Ferromagnetic La0.6Pb0.4MnO3 thin films with giant magnetoresistance at 300 KJournal of Applied Physics, 1994
- Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O FilmsScience, 1994
- Giant magnetoresistance materials and their potential as read head sensorsIEEE Transactions on Magnetics, 1994
- Magnetoresistance in magnetic manganese oxide with intrinsic antiferromagnetic spin structureApplied Physics Letters, 1993
- Giant negative magnetoresistance in perovskitelike ferromagnetic filmsPhysical Review Letters, 1993
- A review of magnetic sensorsProceedings of the IEEE, 1990