Electrical and Magnetic Properties of Polycrystalline Mn-Doped BaTiO&lt;sub&gt;3&lt;/sub&gt; Thin Films Grown on Pt/Sapphire Substrates by Pulsed Laser Deposition

Yao Shuai,Sheng Qiang Zhou,Heidemarie Schmidt

doi:10.4028/www.scientific.net/ast.67.212

Abstract

5 at.% Mn-doped and undoped, 200 nm thick BaTiO3 thin films have been grown under different oxygen partial pressures by pulsed laser deposition on Pt/sapphire substrates. X-ray diffraction (XRD) measurements reveal the same polycrystalline single-phase perovskite structure for all the thin films despite the different oxygen partial pressure, while their preferred orientation strongly depends on the oxygen partial pressure. The 5 at. % Mn-doping decreases the dielectric loss of the Mn-doped BaTiO3 thin films, however, their relative permittivity is also decreased. Ferroelectricity has been probed on the Mn-doped and undoped BaTiO3 thin films grown under relatively high oxygen partial pressure. A ferromagnetic coupling of the Mn dopant ions has been probed at room tempetature on the Mn-doped BaTiO3 thin films prepared under low oxygen partial pressure and is understood in terms of the bound magnetic polaron model.

Highlights

Much work has been carried out in the field of perovskite oxides due to their relatively simple structure and widespread applications including for example sensors, transducers, and memories
A ferromagnetic coupling of the Mn dopant ions has been probed at room tempetature on the Mn-doped BaTiO3 thin films prepared under low oxygen partial pressure and is understood in terms of the bound magnetic polaron model
The BTO thin film is preferential (111)-oriented (Fig. 1(a)), the BTMO thin film deposited at 0.1 mbar oxygen pressure reveals a random orientation (Fig. 1(b)), while the BTMO thin film deposited at 0.01 mbar oxygen pressure was highly (001)-oriented (Fig. 1(c))

Summary

Introduction

Much work has been carried out in the field of perovskite oxides due to their relatively simple structure and widespread applications including for example sensors, transducers, and memories. 5 at.% Mn-doped and undoped, 200 nm thick BaTiO3 thin films have been grown under different oxygen partial pressures by pulsed laser deposition on Pt/sapphire substrates. Ferroelectricity has been probed on the Mn-doped and undoped BaTiO3 thin films grown under relatively high oxygen partial pressure.

Results

Conclusion