Enhanced tunability of electrical and magnetic properties in (La,Sr)MnO3thin films via field-assisted oxygen vacancy modulation

Hon Fai Wong, Sheung Mei Ng, Wang Fai Cheng, Yukuai Liu, Xinxin Chen, Danny von Nordheim, Chee Leung Mak, Jiyan Dai, Bernd Ploss, Chi Wah Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Two different switching behaviors were observed upon application of gate voltages with either high or low magnitudes. The application of single voltage pulses of alternating polarity with an amplitude high enough to switch the remanent polarization of the ferroelectric copolymer led to a 15% change of the resistance of the LSMO channel at temperature 300 K (but less than 1% change at 20 K). A minimal shift of the peak in the resistance-temperature plot was observed, implying that the Curie temperature TCof the manganite layer is not changed. Alternatively, the application of a chain of low voltage pulses was found to shift TCby more than 16 K, and a change of the channel resistance by a 45% was obtained. We attribute this effect to the field-assisted injection and removal of oxygen vacancies in the LSMO layer, which can occur across the thickness of the oxide film. By controlling the oxygen migration, the low-field switching route offers a simple method for modulating the electric and magnetic properties of manganite films.
Original languageEnglish
Pages (from-to)56-61
Number of pages6
JournalSolid-State Electronics
Volume138
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Ferroelectric
  • LSMO
  • Pulse chains
  • Voltage control magnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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