Micromagnetics of magnetic chemical modulations in soft-magnetic cylindrical nanowires

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Álvaro Gómez, Laura and Ruiz Gómez, S. and Fernández González, Claudia and Schobitz, M. and Mille, N. and Hurst, J. and Tiwari, D. and De Riz, A. and Andersen, I. M. and Bachmann, J. and Cagnon, L. and Foerster, M. and Belkhou, R. and Toussaint, J-C and Thirion, C. and Masseboeuf, A. and Gusakova, D. and Pérez García, Lucas and Fruchart, O. (2022) Micromagnetics of magnetic chemical modulations in soft-magnetic cylindrical nanowires. Physical review B, 106 (5). ISSN 2469-9950

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Official URL: http://dx.doi.org/10.1103/PhysRevB.106.054433




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).


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©2022 American Physical Society
We acknowledge support from the French RENATECH network, the team of the Nanofab platform (CNRS Neel institut) , and the CNRS-CEA METSA French network (FR CNRS 3507) . The project received financial support from the French National Research Agency (Grant No. ANR-17-CE24-0017-01; MATEMAC-3D) , from the Spanish MCIN/AEI/10.13039/501100011033 under Grant No. PID2020-117024GB-C43, and from the Comunidad de Madrid (Spain) through the project NanoMagCOST (CM S2018/NMT-4321) . S.R.-G. gratefully acknowledges the financial support of the Alexander von Humboldt Foundation.

Uncontrolled Keywords:Domain-wall; Giant magnetoresistance; Configurations; Dependence; Beamline; Reversal; Arrays; Length
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:74880
Deposited On:04 Oct 2022 12:04
Last Modified:04 Oct 2022 12:04

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