The strength, or stiffness , of the magnetic unidirectional anisotropy in Co (90–300 Å)/CoO bilayers has been studied with ac susceptometry. We develop a model to describe the ac susceptibility which indicates that the stiffness decreases linearly with temperature as . As the temperature increases and decreases, a rotation of the magnetization to a uniaxial easy direction is observed. The values of determined by this small amplitude field oscillation technique are found to be larger than the values obtained when evaluated by the usual hysteresis loop technique. We observe that the exchange field, could be greatly enhanced and its deterioration after repeated magnetization reversals significantly reduced by partially capping the Co surface prior to oxygen exposure.
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15 April 1997
The 41st annual conference on magnetism and magnetic materials
12-15 Nov 1996
Atlanta, Georgia (USA)
Research Article|
April 15 1997
Determination of exchange anisotropy by means of ac susceptometry in Co/CoO bilayers
Valter Ström;
Valter Ström
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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B. J. Jönsson;
B. J. Jönsson
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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K. V. Rao;
K. V. Rao
Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Dan Dahlberg
Dan Dahlberg
Tate Laboratory of Physics, School of Physics and Astronomy, 116 Church Street S. E., Minneapolis, Minnesota 55455
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J. Appl. Phys. 81, 5003–5005 (1997)
Citation
Valter Ström, B. J. Jönsson, K. V. Rao, Dan Dahlberg; Determination of exchange anisotropy by means of ac susceptometry in Co/CoO bilayers. J. Appl. Phys. 15 April 1997; 81 (8): 5003–5005. https://doi.org/10.1063/1.364967
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