Microstructural evolution and correlated magnetic domain configuration of nanoparticles embedded in a single crystal of Cu75-Ni20-Fe5 alloy

Jun Seop Kim, Toshiyuki Taniuchi, Masaki Mizuguchi, Shik Shin, Koki Takanashi, Mahoto Takeda

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We have investigated the microstructural evolution and magnetic domain configurations in nano-scale Fe-Ni rich precipitates formed in a single-crystal specimen of Cu-20at%Ni-5at%Fe alloy on isothermal annealing at 873 K and 973 K, using a combination of transmission electron microscopy (TEM), electron backscattering diffraction, field-emission scanning electron microscopy (FE-SEM), and laser-based photoemission electron microscopy (laser-PEEM). The TEM and FE-SEM observations showed that small, spherical solute-rich particles formed randomly in the initial stage of the precipitation, but on isothermal annealing, cubic, rectangular, plate-shaped and rod-shaped precipitates appeared and aligned along the <1 0 0 > directions in the copper-rich matrix. Laser-PEEM was applied to single-crystal specimens of the alloy and allowed direct observations of magnetic domain configurations in individual ferromagnetic particles at the nanometer scale. This revealed that cubic particles of size approximately 50-60 nm consist of single magnetic domains, but particles of size 100 nm have a closed spin structure (e.g. vortex or multiple domains).

Original languageEnglish
Article number335006
JournalJournal of Physics D: Applied Physics
Volume49
Issue number33
DOIs
Publication statusPublished - 2016 Jul 25

Keywords

  • Cu-Ni-Fe alloy
  • PEEM
  • magnetic-domain configuration
  • microstructure
  • single crystal

ASJC Scopus subject areas

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

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