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EFFECT OF THE DIRECTION OF AN EXTERNAL APPLIED MAGNETIC FIELD ON THE MICROMAGNETIC PROPERTIES OF Fe CUBOIDS
EFECTO DE LA DIRECCIÓN DE UN CAMPO MAGNÉTICO EXTERNO APLICADO SOBRE LAS PROPIEDADES MICROMAGNÉTICAS DE CUBOIDES DE Fe
DOI:
https://doi.org/10.15446/mo.n65.100454Keywords:
cuboid, micromagnetic program, finite differences, hysteresis loops (en)cuboide, programa micromagnético, diferencias finitas, ciclos de histéresis (es)
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We present the results of the study of the micromagnetic properties and the magnetization dynamics of a system of Fe cuboids with a square base of length L = 120 nm and thickness, t = 9 nm, under free boundary conditions as a function of the angle of an in-plane applied external magnetic field, for which we have used the Ubermag micromagnetic program that uses the OOMMF package and the finite difference method with a cell size, c = 3 nm. Hysteresis loops show that the coercive field (Hc) decreases with increasing azimuthal angle, from one easy-magnetizing axis to the other; in turn, the remanent magnetization (Mr) remains constant and magnetization diagrams indicate the presence of magnetic domains and walls in the (x, y) plane, accompanied by a magnetization component that points, both, outward and inward of the plane. This behavior is associated with the type of anisotropy and the aspect ratio of the cuboid. Finally, energy graphs show how the competition between the dipole (Ed), the exchange (Eex), anisotropy (EK), and Zeeman (EZ) energies occurs along the hysteresis loops.
Presentamos los resultados del estudio de las propiedades micromagnéticas y la dinámica de la magnetización de un sistema de cuboides de Fe de base cuadrada de longitud L = 120 nm y espesor t = 9 nm, bajo condiciones de frontera libre en función del ángulo de un campo magnético externo aplicado en el plano, para lo cual hemos utilizado el programa micromagnético Ubermag, que utiliza el paquete OOMMF y el método de diferencias finitas con un tamaño de celda c = 3 nm. Los ciclos de histéresis muestran que el campo coercitivo (Hc) disminuye con el aumento del ángulo azimutal, desde un eje de fácil magnetización hasta el otro; a su vez, la magnetización remanente (Mr) permanece constante y los diagramas de magnetización indican la presencia de dominios y paredes de dominio magnético en el plano (x, y), acompañados de una componente de magnetización que apunta tanto hacia fuera como hacia dentro del plano. Este comportamiento está asociado al tipo de anisotropía y a la relación de aspecto del cuboide. Por último, los gráficos de energía muestran cómo se produce la competencia entre las energías dipolar (Ed), intercambio (Eex), anisotropía (EK) y Zeeman (EZ) a lo largo de los ciclos de histéresis.
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