Giant positive magnetoresistance in ferromagnetic manganites/silicon nanotips diode

Cheong-Wei Chong, Daniel Hsu, Wei Chao Chen, Chien Cheng Li, Jauyn Grace Lin, Li Chyong Chen, Kuei Hsien Chen, Yang Fang Chen

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The current-voltage relations and magnetotransport properties of La 0.7Sr 0.3MnO 3/Si-nanotips and La 0.7Sr 0.3MnO 3/Si-film junctions are studied, revealing that their transport properties are dominated by various mechanisms depending on temperature and bias voltage. A giant positive magnetoresistance (PMR) of ∼200% is observed at 40 K in La 0.7Sr 0.3MnO 3/Si-nanotips junction. The temperature dependence of resistance in the presence of magnetic field suggests the origin of giant PMR to be the strong electron-electron interaction and electron-magnon scattering. Interestingly, such behavior is not observed in regular La 0.7Sr 0.3MnO 3/Si-film junction, implying that the coupling between spin and charge could be greatly enhanced at the interface of La 0.7Sr 0.3MnO 3 and Si nanotips.

Original languageEnglish
Pages (from-to)21132-21137
Number of pages6
JournalJournal of Physical Chemistry C
Volume116
Issue number39
DOIs
Publication statusPublished - 2012 Oct 4

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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