Projects: Nanostructured Hybrid Systems

Research Projects of the Nanostructured Hybrid Systems Group

11

Jan 2014

Reversal processes of magnetization and propagation of domain walls in nanostructured magnetic systems with magnetic exchange

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This project has been devoted to the fabrication of nanostructured magnetic systems and to the study of magnetization reversal processes in the presence of lithographically defined antidots in two different kinds of magnetic systems. In the first case, arrays of antidots have been fabricated on ferromagnetic/antiferromagnetic bilayers in order to tune exchange bias effects through magnetic domain confinement (see Fig.1).

Figure 1: (Left) Topography of a square array of antidots on a Ni/FeF2 bilayer. (Right) Bridge for magnetotransport measurements in nanostructured Ni/FeF2 bilayers.

Figure 1: (Left) Topography of a square array of antidots on a Ni/FeF2 bilayer. (Right) Bridge for magnetotransport measurements in nanostructured Ni/FeF2 bilayers.

 

In the second case, domain wall propagation has been studied in perpendicular anisotropy Co/Pt nanowires in order to analyze the interplay between collective and localized pinning effects (see Fig.2).

Figure 2: (Left) Triangular hole defined on a Co/Pt bridge for domain wall pinning. (Right) Time resolved magnetoresistance curves used to obtain domain wall velocity and propagation sense.

Figure 2: (Left) Triangular hole defined on a Co/Pt bridge for domain wall pinning. (Right) Time resolved magnetoresistance curves used to obtain domain wall velocity and propagation sense.

Consortium: CINN

Funding: FICYT

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11

Jan 2014

Artificially prepared and self- assembled 2D arrays of magnetic nanoelements

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In this project, performed in collaboration with University of Porto (Portugal), high- density bidimensional arrays of magnetic nanoelements governed by dipolar interactions have been patterned and studied by Magnetic Force Microscopy (MFM) and magnetooptical kerr effect, as well as by micromagnetic simulations and analytical modeling. The results have revealed the important role of the geometrical configuration of the nanoelements in the magnetization reversal processes (Fig. 1).

Consortium: CINN and University of Oporto

Funding: Spanish Ministry of Science and Innovation (MICINN)

 

(Top) 2D arrays of magnetic Co nanoelements patterned by electron beam lithography in rectangular (left) and rhombic (right) lattices. (Bottom) MFM images of rectangular and rhombic lattices at magnetic saturation. (Phys. Rev. B 84, 052402 (2011))

(Top) 2D arrays of magnetic Co nanoelements patterned by electron beam lithography in rectangular (left) and rhombic (right) lattices. (Bottom) MFM images of rectangular and rhombic lattices at magnetic saturation. (Phys. Rev. B 84, 052402 (2011))

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