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Magnetic properties of exchange-coupled Fe/FeO bilayers

Journal of Applied Physics, ISSN: 0021-8979, Vol: 79, Issue: 8 PART 2A, Page: 5106-5108
1996
  • 26
    Citations
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  • 15
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Metrics Details

  • Citations
    26
    • Citation Indexes
      26
  • Captures
    15

Article Description

The magnetic, structural and microstructural properties of sputtered Fe thin films and Fe\Fe-O bilayers were studied as a function of the Fe layer thickness, the type of the Fe oxide and the substrate used. Two different ways to prepare the oxide layers were used; postdeposition oxidation and reactive sputtering. Postdeposition oxidation produced films with mixed Fe-oxides (FeO, FeO, FeO); however reactive sputtering led to bilayers with controlled stoichiometry, Fe\FeO, Fe\FeO, and Fe\FeO, respectively. The coercivity of both the Fe films and Fe\Fe-O bilayers, deposited on substrates with or without Cr buffer layer, was found to increase with decreasing Fe film thickness. The coercivity of the samples deposited on a Ag buffer layer was much lower and did not change substantially with the Fe film thickness. The presence of the Fe-oxide layer led to a large increase of coercivity. This is attributed to the higher anisotropy of the oxide and to exchange coupling of Fe-oxide with the softer Fe layer. © 1996 American Institute of Physics.

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