| Abstrakt: |
In the present work, a study on magnetic symmetry breaking is carried out in 3 × 3 arrangements of hollow Ni nanopillars. For the study, the results of ferromagnetic resonance were used by micromagnetic simulation. The external field is varied in intensity and in different orientations in order to determine the resonance field in each direction. We mainly use the configuration with a field parallel to the axis of the pillars (PL) and for a field perpendicular to the pillars. Then, a sweep is made at different angles in the plane perpendicular to the pillars. The array is composed of PL with a square base of 30 nm lateral dimension and 120 nm length. Each PL has an internal cavity that extends the length of the structure. Two sizes of this well were chosen, 10 and 20 nm. The distance between pillars is changed by four values so that the walls of the pillars are distanced in a-D = 5, 10, 20, and 50 nm. This variation was schooled in such a way that the dipole interactions were from very low values to relatively large values to the point of breaking the symmetry due to magnetostatic interactions between PL. The angular dependence of this frequency as a function of the perpendicular field determines the anisotropy field and with that, it is possible to understand from the point of view of symmetry associated with the independent PL, the effects of dipole interactions between pillars in the arrangement. [ABSTRACT FROM AUTHOR] |
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