Nano-domain orientation modulation of photoresponse based on anisotropic transport in manganite films

¹ State Key Laboratory of Heavy Oil Processing, China University of Petroleum - Beijing 102249, PRC
² College of Science, China University of Petroleum - Beijing 102249, PRC
³ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
⁴ Department of Physics, The Chinese University of Hong Kong - Hong Kong, China
⁵ International Center for Materials Physics, Chinese Academy of Sciences - Shenyang 110016, China

^a zhk@cup.edu.cn
^b kjjin@iphy.ac.cn

Received: 26 November 2011
Accepted: 20 January 2012

Abstract

Anisotropic carrier transports have been observed in La_0.67Ca_0.33MnO₃ and La_0.4Ca_0.6MnO₃ films grown on miscut MgO (001) substrates under pulsed-laser irradiations without external bias. We discussed the mechanism of the transport process under ultrafast laser irradiation in tilted manganite films. A model of anisotropic diffusion in transient photoresponse is presented. From the microstructure of La_0.4Ca_0.6MnO₃ and its photoresponse property in different directions, we can see that the nanometer size domain orientation can modulate the photoresponse signals, indicating a new-type nanometer scale photosensitive source.