Direct observation of room temperature magnetism in (In,Mn)As thin films by magnetic force microscopy

S. J. May, A. J. Blattner, D. P. Eam, Bruce W Wessels*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Variable-temperature magnetic force microscopy (MFM) has been performed over the temperature range of 298-348 K on ferromagnetic (In,Mn)As thin films deposited by metal-organic vapor phase epitaxy (MOVPE). Ferromagnetic domains were observed with submicron resolution in both single and two phase (In,Mn)As films, persisting up to 328 K. Isolated cylindrical domains ranging from 100 to 350 nm in diameter with densities of 2-5 × 10 8 cm -2 were observed in phase pure films. Longer range magnetic order, in the form of ribbon-like domains up to 1 μm in length, are present in the regions between the cylindrical domains. Two phase (In,Mn)As films produced a well-resolved complex domain structure consisting of 180° parallel and antiparallel domains. Excellent agreement between the temperature dependence of the relative magnetization obtained by MFM and superconducting quantum interference device measurements was observed.

Original languageEnglish (US)
Pages (from-to)3509-3513
Number of pages5
JournalApplied Surface Science
Volume252
Issue number10
DOIs
StatePublished - Mar 15 2006

Keywords

  • Ferromagnetic semiconductors
  • Magnetic domains
  • Magnetic force microscopy

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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