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Thickness-dependent properties of (110)-oriented La1.2Sr1.8Mn2O7 thin films

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8 Author(s)
Takamura, Yayoi ; Department of Materials Science and Engineering, University of California-Berkeley, Berkeley, California 94720 and Lawrence Berkeley National Laboratory, Berkeley, California 94720 ; Chopdekar, Rajesh V. ; Grepstad, Jostein K. ; Suzuki, Yuri
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We have grown (110)-oriented thin films of the bilayer manganite La1.2Sr1.8Mn2O7 [n=2 phase of the Ruddlesden-Popper (RP) family] by pulsed laser deposition. The structural, magnetic, and magnetotransport properties of these films depend strongly on the growth conditions as well as the film thickness. Optimal growth conditions of 900 °C and 100 mTorr O2 balance the oxygenation of the n=2 phase without causing its decomposition into the n=1 and phases of the RP family. With increasing film thickness, the film evolves from a mixture of the n=1, 2, and phases to a film composed primarily of the n=2 phase. The thicker films possess bulklike properties with a ferromagnetic/paramagnetic transition that coincides with a resistivity maximum at a reduced Tc∼90 K (vs 120 K in bulk) and an anisotropy ratio, ρcab∼20–200 over the temperature range 5–380 K.

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Journal of Applied Physics  (Volume:99 ,  Issue: 8 )