Growth, Magnetic and Electrical Transport Properties of La0.7Sr0.3MnO3 Thin Films on PLZST Ceramics

doi:10.15541/jim20160332

Abstract

Abstract:

La_0.7Sr_0.3MnO₃ (LSMO) thin films with different thicknesses were deposited on (Pb_0.97La_0.02) (Zr_0.58Sn_0.3025Ti_0.1175)O₃ (PLZST) ceramics by RF magnetron sputtering, and their microstructure, magnetic and electrical transport properties were investigated. Microscopy observations show that LSMO thin films are perovskite structure without obvious impurity phase. All the LSMO thin films display smooth surface with uniform, and roughness is as low as 2.93 nm for LSMO thin films at the thickness of 20 nm. Furthermore, large magnetoresistance (MR) effect was observed in LSMO thin films in a broad temperature range of 10-300 K. Particularly the MR of LSMO thin films with 20 nm in thickness exhibits excellent temperature stability. Moreover, the Curie temperature, metal-insulator transition temperature, saturation magnetization and electrical conductivity decrease as the film thickness increases, which is attributed to the diffusion of Pb, Sn, Zr, etc. in the samples, resulting in the distortion of MnO₆ octahedron.

Key words: La0.7Sr0.3MnO3 thin films, PLZST ceramics, magnetoresistance, diffusion

CLC Number:

TQ174

XIAO Ling, CHEN Ying, LIU Zhen, WANG Gen-Shui, WEN Zhi-Yu, DONG Xian-Lin. Growth, Magnetic and Electrical Transport Properties of La_0.7Sr_0.3MnO₃ Thin Films on PLZST Ceramics[J]. Journal of Inorganic Materials, 2017, 32(3): 326-330.

Figures/Tables 6

Fig. 1 XRD patterns of LSMO thin films with different thicknesses

Fig. 2 AFM surface morphologies of LSMO thin films with different thicknessess(a) 120 nm; (b) 65 nm; (c) 20 nm

Fig. 3 Cross section SEM and energy dispersive spectroscopy line profiles of LSMO thin films(a, b) 20 nm; (c, d) 120 nm

Fig. 4 Temperature dependent resistivity of LSMO films under zero field (a) and temperature-dependent magnetoresistance of LSMO films under 6 T (b)

Fig. 5 Magnetic field dependence of MR ratio of LSMO films with different thicknesses at 250 K

Fig. 6 (a) Temperature dependence of magnetization of LSMO thin films with inset showing temperature dependence of the derivative of magnetization and (b) magnetic hysteresis loops of LSMO thin films with different thicknesses measured at 300 K

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Growth, Magnetic and Electrical Transport Properties of La_0.7Sr_0.3MnO₃ Thin Films on PLZST Ceramics

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