Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts

Han Chun Wu, Mohamed Abid, Byong S. Chun, Rafael Ramos, Oleg N. Mryasov, Igor V. Shvets

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

We have probed one antiferromagnetic (AF) antiphase boundary (APB) and a single Fe3O4 domain using nanogap contacts. Our experiments directly demonstrate that, in the case of probing one AF-APB, a large magnetoresistance (MR), high resistivity, and a high saturation field are observed as compared with the case of probing a single Fe3O 4 domain. The shape of the temperature-dependent MR curves is also found to differ between the single domain and one of the AF-APB measurements, with a characteristic strong temperature dependence for the single domain and temperature independence for the one AF-APB case. We argue that these observations are indicative of profound changes in the electronic transport across APBs. The investigated APB defects increase the activation energy and disturb the long-range charge ordering of monodomain Fe3O 4.

Original languageEnglish
Pages (from-to)1132-1136
Number of pages5
JournalNano Letters
Volume10
Issue number4
DOIs
Publication statusPublished - 2010 Apr 14
Externally publishedYes

Keywords

  • Antiphase Boundary
  • Half-metal
  • Magnetite
  • Monodomain

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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