Direct observation of current-induced conductive path in colossal-electroresistance manganite thin films

Wengang Wei, Yinyan Zhu, Yu Bai, Hao Liu, Kai Du, Kai Zhang, Yunfang Kou, Jian Shao, Wenbin Wang, Denglu Hou, Shuai Dong, Lifeng Yin, and Jian Shen
Phys. Rev. B 93, 035111 – Published 12 January 2016
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Abstract

Manganites are known to often show colossal electroresistance (CER) in addition to colossal magnetoresistance. The (La1yPry)1xCaxMnO3 (LPCMO) system has a peculiar CER behavior in that little change of magnetization occurs. We use a magnetic force microscope to uncover the CER mechanism in the LPCMO system. In contrast to the previous belief that current reshapes the ferromagnetic metallic (FMM) domains, we show that the shape of the FMM domains remain virtually unchanged after passing electric current. Instead, it is the appearance of a tiny fraction of FMM “bridges” that is responsible for the CER behavior.

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  • Received 7 October 2015
  • Revised 30 November 2015

DOI:https://doi.org/10.1103/PhysRevB.93.035111

©2016 American Physical Society

Authors & Affiliations

Wengang Wei1,2, Yinyan Zhu1, Yu Bai1, Hao Liu1, Kai Du1, Kai Zhang1, Yunfang Kou1, Jian Shao1, Wenbin Wang1, Denglu Hou2, Shuai Dong3, Lifeng Yin1,4,*, and Jian Shen1,4,†

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • 2College of Physics and Information Engineering, Hebei Normal University, Shijiazhuang 050024, China
  • 3Department of Physics, Southeast University, Nanjing 211189, China
  • 4Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

  • *To whom correspondence should be addressed: lifengyin@fudan.edu.cn
  • shenj5494@fudan.edu.cn.

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Issue

Vol. 93, Iss. 3 — 15 January 2016

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