Pinned Co moments in a polycrystalline permalloy/CoO exchange-biased bilayer

E. Blackburn, C. Sanchez-Hanke, S. Roy, David Smith, J. I. Hong, K. T. Chan, A. E. Berkowitz, S. K. Sinha

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Abstract

We have measured element-specific magnetization depth profiles across the interface between a polycrystalline ferromagnet and an antiferromagnet in an exchange-biased bilayer of Py/CoO. Using soft x-ray resonant reflectivity we have identified a thin (0.5 nm) layer containing uncompensated Co magnetization at the interface with the Py. The majority of this magnetization follows the external field; however, ∼10% of the magnetization in this interfacial layer is pinned antiparallel to the cooling field used when biasing the sample, consistent with the negative exchange bias in this bilayer system, provided that the pinned Co spins are antiferromagnetically coupled to the ferromagnetic layer.

Original languageEnglish (US)
Article number180408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number18
DOIs
StatePublished - Nov 14 2008

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Blackburn, E., Sanchez-Hanke, C., Roy, S., Smith, D., Hong, J. I., Chan, K. T., Berkowitz, A. E., & Sinha, S. K. (2008). Pinned Co moments in a polycrystalline permalloy/CoO exchange-biased bilayer. Physical Review B - Condensed Matter and Materials Physics, 78(18), [180408]. https://doi.org/10.1103/PhysRevB.78.180408