Super-exchange interaction model in DMOs: Co doped TiO2 thin films

Quiroz, Heiddy P.; Galíndez, E. F.; Dussán, A.; Cardona-Rodríguez, Alexander; Ramírez, Juan Gabriel

doi:10.1007/s10853-020-05282-2

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…In fact, the delicate balance between the different energies (e.g., exchange, Zeeman, magnetostatic, and anisotropy) can also give rise to the formation of a vortex core with a high exchange energy density near the vortex center with an out-of-plane magnetization as a mechanism to decrease the exchange energy. This is an important feature, for instance in patterned nanomagnets [ 9 ], where dipolar interactions are not desirable for specific applications [ 11 ] such as spin-transfer torque nano-oscillators, high-density magnetic data storage, magnetic field sensors, logic operation devices, spintronics, biomedical applications [ 12 , 13 , 14 ], etc. In this way, a full characterization of this type of magnetic textures, not only experimentally but also from a computational standpoint, is needed.…”

Section: Introductionmentioning

confidence: 99%

Field-Driven Magnetic Phase Diagram and Vortex Stability in Fe Nanometric Square Prisms

2022

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In this work, we deal with the zero temperature hysteretic properties of iron (Fe) quadrangular nanoprisms and the size conditions underlying magnetic vortex states formation. Different aspect ratios of a square base prism of thickness t with free boundary conditions were considered in order to summarize our results in a proposal of a field-driven magnetic phase diagram where such vortex states are stable along the hysteresis loops. To do that, a Hamiltonian consisting of exchange, magnetostatic, Zeeman and cubic anisotropy energies was considered. The time dynamics at each magnetic field step was performed by solving the time-dependent Landau–Lifshitz–Gilbert differential equation. The micromagnetic simulations were performed using the Ubermag package based on the Object Oriented Micromagnetic Framework (OOMMF). Circular magnetic textures were also characterized by means of topological charge calculations. The aspect ratio dependencies of the coercive force, nucleation and annihilation fields are also analyzed. Computations agree with related experimental observations and other micromagnetic calculations.

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