Exchange coupling and spin-flip transition of CoFe2O4/α-Fe2O3 bilayered films

Tatsuo Fujii, Takuya Yano, Makoto Nakanishi, Jun Takada

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

CoFe2O4/α-Fe2O3 (ferrimagnetic/antiferromagnetic) bilayered films were prepared on α-Al2O3(102) single-crystalline substrates by helicon plasma sputtering. A well-crystallized epitaxial α-Fe2O3(102) layer was formed on the substrate, while CoFe2O4 grown on α-Fe2O3 (102) was a polycrystalline layer with a (100)-preferred orientation. The α-Fe2O3(102) films without CoFe2O4 layers clearly showed a spin-flip transition at about 400 K. The spins aligned perpendicular to the film plane at room temperature changed their direction within the film plane above 400 K. However the α-Fe2O3 base layers of CoFe2O4/α-Fe2O3 bilayered films did not show any spin-flip transition. The CoFe2O4 layer on α-Fe2O3 had a large in-plane magnetic anisotropy, while the spin axis of the α-Fe2O3 (102) base layer was directed perpendicular to the film plane. The magnetization of ferrimagnetic CoFe2O4 layers was coupled perpendicularly to the spin axis of antiferromagnetic α-Fe2O3 layers due to the exchange coupling at the interface between CoFe2O4 and α-Fe2O3.

Original languageEnglish
Pages (from-to)T1.10.1-T1.10.6
JournalMaterials Research Society Symposium - Proceedings
Volume674
DOIs
Publication statusPublished - Jan 1 2001
EventApplications of Ferromagnetic and Optical Materials, Storage and Magnotoelectronics - San Francisco, CA, United States
Duration: Apr 16 2001Apr 20 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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