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Magnetic Anisotropies of FeO and NiMn Films

  • B. Aktaş
  • M. Özdemir
  • R. Yilgin
  • Y. Öner
  • T. Sato
  • T. Ando
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 593)

Abstract

Epitaxial Fe3O4 films on MgO(100) substrate and polycrystalline reentrant Ni77Mn23 films of various thickness (50, 100, 300, 600, 1000, 3700Å) on quartz substrate have been studied by Spin Wave Resonance (SWR) as a function of temperature. The SWR spectra have unusual uni-directional character upon cooling the sample in an external field Hc. All films show spin-glass properties in the temperature range below freezing temperature Tf (about 120K for NiMn and 70K for Fe3O4). The number of peaks increases with film thickness, indicating long spin wave excitation across the film thickness.

The angular dependent SWR spectra were successfully analyzed by usual classical SWR theory. Using a field induced unidirectional exchange surface and bulk anisotropy together with usual magneto-crystalline anisotropy energy, we have simulated the experimental spectra and deduced magnetic parameters. The effective exchange stiffness parameter (D) remains practically the same for all films above Tf, while its value surprisingly increases below Tf, showing a strong correlation with spin-glass properties. The bulk anisotropy was found to strongly enhance with decreasing temperature and film thickness, while linearly temperature dependent surface anisotropy shows very weak thickness dependence. The easy-plane surface anisotropy on both substrate and free surfaces has been attributed to an intrinsic property for the films rather than accidental surface condition.

Keywords

Magnetic Anisotropy Spin Wave Surface Anisotropy Exchange Anisotropy Spin Wave Resonance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • B. Aktaş
    • 1
  • M. Özdemir
    • 2
  • R. Yilgin
    • 1
  • Y. Öner
    • 3
  • T. Sato
    • 4
  • T. Ando
    • 5
  1. 1.Department of PhysicsGebze Institute of TechnologyGebze, KocaeliTurkey
  2. 2.Department of PhysicsMarmara UniversityGöztepe, IstanbulTurkey
  3. 3.Department of PhysicsIstanbul Technical UniversityMaslak, IstanbulTurkey
  4. 4.Department of Instrument. Eng., Fac. Sci. and Techno.Keio. UnivYokohama, KanagavaJapan
  5. 5.Department of Material Science, Fac. Sci. and Techno.Keio. UnivYokohama, KanagavaJapan

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