Influence of dipolar energy on the magnetization reversal in magnetization-modulated thin film systems: Model and experiment


Influence of dipolar energy on the magnetization reversal in magnetization-modulated thin film systems: Model and experiment

Martin, N.; Mönch, I.; Schäfer, R.; Fassbender, J.; Schultz, L.; McCord, J.

Laterally patterned magnetic hybrid structures display novel magnetic reversal properties, which are related to the fundamental exchange coupling between material interfaces. We present an analytical model that depicts the influence of dipolar fields inmesoscopic structureswith modulated saturationmagnetization on the magnetization reversal and the local magnetic states, as well as the occurrence of a lateral exchange-spring effect. This is done by confining a lateral array of stripes with alternating saturation magnetizationMS in a micrometer-sized square, introducing external boundary conditions to the system. The calculations were performed for distinct stripe and array sizes, as well as different MS values. From the calculations a stability region of array and stripe sizes is derived, in which the lateral exchange-spring effect occurs. The obtained modeling results were found to be in agreement with the experimental data. The model adds a building block to the fundamental understanding of magnetic hybrid structures.

Keywords: magnetism; hybrid structures; ion irradiation; patterning; Kerr microscopy

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Publ.-Id: 15923