Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers.

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Exchange bias of a partially oxidized thin film of ferromagnetic Co was studied by magnetization measurements and polarized neutron reflectivity (PNR). The magnetization curve shows strong effects of training with cycling of the magnetic field. Reflectivity measurements with the field parallel to the cooling field showed the onset of spin-dependent diffuse scattering--off the specular reflection--after a training cycle. Such scattering, of the Yoneda type, is due to misaligned Co domains possibly close to the Co/CoO interface. Subjecting the field cooled Co/CoO pair to a field perpendicular to the cooling field causes a rotation of the magnetization. PNR measurements confirmed earlier ... continued below

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13 p.

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Berger, A.; Dahlberg, E. D.; Felcher, G. P.; Hill, B. K. & te Velthius, S. G. E. September 1, 1999.

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Exchange bias of a partially oxidized thin film of ferromagnetic Co was studied by magnetization measurements and polarized neutron reflectivity (PNR). The magnetization curve shows strong effects of training with cycling of the magnetic field. Reflectivity measurements with the field parallel to the cooling field showed the onset of spin-dependent diffuse scattering--off the specular reflection--after a training cycle. Such scattering, of the Yoneda type, is due to misaligned Co domains possibly close to the Co/CoO interface. Subjecting the field cooled Co/CoO pair to a field perpendicular to the cooling field causes a rotation of the magnetization. PNR measurements confirmed earlier susceptibility studies by indicating that the rotation of the magnetization is reversible in fields up to 400 Oe. The rotation of the magnetization of Co is uniform across the film thickness.

Physical Description

13 p.

Notes

OSTI as DE00011848

Medium: P; Size: 13 pages

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  • 44th Annual Conference on Magnetism and Magnetic Materials, San Jose, CA (US), 11/15/1999--11/18/1999

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  • Report No.: ANL/IPNS/CP-99222
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11848
  • Archival Resource Key: ark:/67531/metadc619050

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  • September 1, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 1:19 p.m.

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Berger, A.; Dahlberg, E. D.; Felcher, G. P.; Hill, B. K. & te Velthius, S. G. E. Training effects and the microscopic magnetic structure of exchange biased Co/CoO bilayers., article, September 1, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc619050/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.