The influence of diameter on the magnetic saturation in Fe84Cu16/MgO [001] multilayered islands

•Alloying Fe multilayers with Cu reduces magnetrocrystalline anisotropy.•Alloying Fe multilayers with Cu decreases interlayer exchange coupling.•Reducing diameter of multilayered islands increases saturation field.•Transition from domain to coherent rotation switching with decreased diameter. The sa...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-02, Vol.496 (C), p.1, Article 165864
Main Authors: Warnatz, Tobias, Skovdal, Björn Erik, Magnus, Fridrik, Stopfel, Henry, Primetzhofer, Daniel, Stein, Aaron, Brucas, Rimantas, Hjörvarsson, Björgvin
Format: Article
Language:English
Subjects:
Anisotropy
Coupling
Interlayers
Islands
Magnesium oxide
Magnetic saturation
Multilayers
NANOSCIENCE AND NANOTECHNOLOGY
Nucleation
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Summary:•Alloying Fe multilayers with Cu reduces magnetrocrystalline anisotropy.•Alloying Fe multilayers with Cu decreases interlayer exchange coupling.•Reducing diameter of multilayered islands increases saturation field.•Transition from domain to coherent rotation switching with decreased diameter. The saturation field of circular islands, consisting of [Fe84Cu16/MgO]9Fe84Cu16 multilayers, increases with decreasing diameter of the islands. When the diameter of the islands is below 450 nm the field induced changes are dominated by a coherent rotation of the moment of the Fe84Cu16 layers. For diameters of 2 μm and larger, a signature of domain nucleation and evolution is observed. The changes in the saturation field with diameter of the islands are ascribed to the interplay between interlayer exchange coupling, stray field coupling at the edges and the crystalline anisotropy of the Fe84Cu16 layers.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.165864