Engineering Magnetic States and Magnetoresistance in Bisegmented Co-Ni Jellyfish Nanowires via Interplay of Shape and Magnetocrystalline Anisotropies

M. I. Sobirov; K. A. Rogachev; M. A. Bazrov; Zh. Zh. Namsaraev; I. M. Sapovskii; T. R. Rakhmatullaev; N. V. Ilin; A. O Lembikov; S. M. Pisarev; A. V. Ognev; A. S. Samardak; A. Yu. Samardak

arXiv · 2510.05618

Engineering Magnetic States and Magnetoresistance in Bisegmented Co-Ni Jellyfish Nanowires via Interplay of Shape and Magnetocrystalline Anisotropies

M. I. Sobirov·K. A. Rogachev·M. A. Bazrov·Zh. Zh. Namsaraev·I. M. Sapovskii·T. R. Rakhmatullaev·N. V. Ilin·A. O Lembikov·S. M. Pisarev·A. V. Ognev·A. S. Samardak·A. Yu. Samardak

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Abstract

Expanding the spectrum of 3D magnetic nanostructures requires mastering the interplay between different anisotropy contributions. Here, we fabricate bisegmented jellyfish nanowires with tailored arrangements of Co (strong magnetocrystalline anisotropy) and Ni (dominant shape anisotropy) segments. We uncover a unique magnetic duality: Co segments can be tuned to exhibit either a flux-closing multidomain state or a shape-anisotropy-dominated vortex configuration, directly governed by their geometry. This local domain structure, imaged by MFM and simulated micromagnetically, dictates the global magnetic response-suppressing magnetostatic interactions in arrays and enabling the programming of the anisotropic magnetoresistance (AMR) in single nanowires. Our work provides a blueprint for designing functional magnetic nanomaterials where magnetoresistive properties are engineered through strategic anisotropy control.

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M. I. Sobirov, K. A. Rogachev, M. A. Bazrov, Zh. Zh. Namsaraev, I. M. Sapovskii, T. R. Rakhmatullaev, N. V. Ilin, A. O Lembikov, S. M. Pisarev, A. V. Ognev, A. S. Samardak, A. Yu. Samardak. 2025-10-07. Engineering Magnetic States and Magnetoresistance in Bisegmented Co-Ni Jellyfish Nanowires via Interplay of Shape and Magnetocrystalline Anisotropies. https://arxiv.org/abs/2510.05618

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