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AbstractAbstract
[en] We have studied the magnetization reversal process in continuous: [Co/CoO]20 and separated: [Co/CoO/Au]20 exchange-biased polycrystalline multilayers (MLs). For continuous ML, reversal proceeds sequentially starting with the bottom (top) Co layer for increasing (decreasing) field. Each Co layer remagnetizes symmetrically for both field branches in a nonuniform mode similarly as we have observed earlier for [IrMn/CoFe]3/10 MLs [Phys. Rev. B. 70, 224410 (2004)]. By polarized neutron reflectivity, we observe increasing exchange bias field strengths down the stack. However, usual asymmetric reversal is observed for the separated ML. We explain the different magnetization behavior within a simple and general model. The increased anisotropy energy for continuous ML is responsible for the nonuniform symmetric reversal as the angular dependencies for reversal are guided by the relative strengths of exchange, anisotropy, and Zeeman energies
Secondary Subject
Source
(c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Physical Review. B, Condensed Matter and Materials Physics; ISSN 1098-0121; ; v. 73(9); p. 092410-092410.4
Country of publication
BARYONS, CHALCOGENIDES, COBALT COMPOUNDS, COHERENT SCATTERING, CRYSTALS, DIFFRACTION, ELEMENTARY PARTICLES, ELEMENTS, FERMIONS, HADRONS, INTERACTIONS, LEPTONS, MAGNETIC MATERIALS, MATERIALS, METALS, NUCLEONS, OPTICAL PROPERTIES, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, SCATTERING, SURFACE PROPERTIES, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS
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