A N Dobrynin et al 2007 New J. Phys. 9 258 doi:10.1088/1367-2630/9/8/258
Evidence for coexistence of exchange bias and exchange spring effects in oxidized Co nanocluster assembled films
A N Dobrynin1, M J Van Bael, K Temst2 and P Lievens3
Show affiliationsWe present the observation of a double hysteresis loop behavior in oxidized Co nanocluster assembled films. These films consist of ferromagnetic Co clusters of about 2 nm diameter, embedded in a thin antiferromagnetic CoO matrix. Magnetization measurements after zero field cooling from 300 to 5 K show this double loop behavior, with remanent magnetization of the sample determining the point of loop separation. Such magnetization behavior is related to the presence of two ferromagnetic parts with antiparallel orientations of their magnetization vectors. While the loop shifts are provided via the exchange bias mechanism, the alignment of randomly oriented magnetization vectors of Co clusters in either of two directions suggests the presence of an exchange spring effect in the system.
- PACS
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Cc Other ferromagnetic metals and alloys
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 8 (August 2007)
Received 28 April 2007
Published 10 August 2007
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Evidence for coexistence of exchange bias and exchange spring effects in oxidized Co nanocluster assembled films
A N Dobrynin et al 2007 New J. Phys. 9 258
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