Surface induced suppression of magnetization in nanoparticles

C. Westman, S. Jang, C. Kim, S. He, G. Harmon, N. Miller, B. Graves, N. Poudyal, R. Sabirianov, H. Zeng, M. Demarco, J. P. Liu

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A model based on competing exchange interactions is presented for the investigation of nanoparticle magnetization. The ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions contribute differently at the nanoparticle surface and interior, leading to reduced ferromagnetic order at the surface. This model predicts an unconventional temperature dependence of magnetization and a surface magnetically 'dead layer'. This is confirmed by temperature dependent magnetization and Mössbauer measurements of FePt nanoparticles. The effects are sensitive to particle size and surface terminations.

Original languageEnglish (US)
Article number225003
JournalJournal of Physics D: Applied Physics
Volume41
Issue number22
DOIs
StatePublished - Nov 21 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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    Westman, C., Jang, S., Kim, C., He, S., Harmon, G., Miller, N., Graves, B., Poudyal, N., Sabirianov, R., Zeng, H., Demarco, M., & Liu, J. P. (2008). Surface induced suppression of magnetization in nanoparticles. Journal of Physics D: Applied Physics, 41(22), [225003]. https://doi.org/10.1088/0022-3727/41/22/225003