Micromagnetics of magnetic chemical modulations in soft-magnetic cylindrical 
nanowires

Álvaro-Gómez, L.; Ruiz-Gómez, S.; Fernández-González, C.; Schöbitz, M.; Mille, N.; Hurst, J.; Tiwari, D.; De Riz, A.; Andersen, I. M.; Bachmann, J.; Cagnon, L.; Foerster, M.; Aballe, L.; Belkhou, R.; Toussaint, J-C; Thirion, C.; Masseboeuf, A.; Gusakova, D.; Pérez, L.; Fruchart, O.

doi:10.1103/PhysRevB.106.054433

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Micromagnetics of magnetic chemical modulations in soft-magnetic cylindrical nanowires

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Ruiz-Gómez, S.
Spin3D: Three-Dimensional Magnetic Systems, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Álvaro-Gómez, L., Ruiz-Gómez, S., Fernández-González, C., Schöbitz, M., Mille, N., Hurst, J., et al. (2022). Micromagnetics of magnetic chemical modulations in soft-magnetic cylindrical nanowires. Physical Review B, 106(5): 054433, pp. 1-5. doi:10.1103/PhysRevB.106.054433.

Cite as: https://hdl.handle.net/21.11116/0000-000B-126F-5

Abstract

We analyze the micromagnetics of short longitudinal modulations of a high-magnetization material in cylindrical nanowires made of a soft-magnetic material of lower magnetization such as permalloy, combining magnetic microscopy, analytical modeling, and micromagnetic simulations. The mismatch of magnetization induces curling of magnetization around the axis in the modulations, in an attempt to screen the interfacial magnetic charges. The curling angle increases with modulation length, until a plateau is reached with nearly full charge screening for a specific length scale delta(mod), larger than the dipolar exchange length of any of the two materials. The curling circulation can be switched by the Oersted field arising from a charge current with typical magnitude 10(12) A/m(2) for a diameter of similar to 100 nm, and reaching a maximum for delta(mod).