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Single crystalline cylindrical nanowires - toward dense 3D arrays of magnetic vortices.

Ivanov YP, Chuvilin A, Vivas LG, Kosel J, Chubykalo-Fesenko O, Vázquez M - Sci Rep (2016)

Bottom Line: Magnetic vortex-based media have recently been proposed for several applications of nanotechnology; however, because lithography is typically used for their preparation, their low-cost, large-scale fabrication is a challenge.In this work, we present this type of nanoscale magnetic structures that can hold multiple stable magnetic vortex domains at remanence with different chiralities.The data we present here introduce a route toward the concept of 3-dimensional vortex-based magnetic memories.

View Article: PubMed Central - PubMed

Affiliation: King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.

ABSTRACT
Magnetic vortex-based media have recently been proposed for several applications of nanotechnology; however, because lithography is typically used for their preparation, their low-cost, large-scale fabrication is a challenge. One solution may be to use arrays of densely packed cobalt nanowires that have been efficiently fabricated by electrodeposition. In this work, we present this type of nanoscale magnetic structures that can hold multiple stable magnetic vortex domains at remanence with different chiralities. The stable vortex state is observed in arrays of monocrystalline cobalt nanowires with diameters as small as 45 nm and lengths longer than 200 nm with vanishing magnetic cross talk between closely packed neighboring wires in the array. Lorentz microscopy, electron holography and magnetic force microscopy, supported by micromagnetic simulations, show that the structure of the vortex state can be adjusted by varying the aspect ratio of the nanowires. The data we present here introduce a route toward the concept of 3-dimensional vortex-based magnetic memories.

No MeSH data available.


Related in: MedlinePlus

(a) A tomographic image of the section of the NW array presented in Fig. 3 and (b) the calculated ground state of magnetization (colors correspond to the in-plane component of magnetization and lines correspond to the B⊥).
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f7: (a) A tomographic image of the section of the NW array presented in Fig. 3 and (b) the calculated ground state of magnetization (colors correspond to the in-plane component of magnetization and lines correspond to the B⊥).

Mentions: We used tomographic data (see Fig. 7a) to run micromagnetic simulations on the part of the array presented in Fig. 3 to account for the magnetostatic interaction between NWs in the array and to define the true shape of NWs. As shown in Fig. 7b, NWs can present either vortex or parallel magnetization states, which agrees well with experimental data (Fig. 3).


Single crystalline cylindrical nanowires - toward dense 3D arrays of magnetic vortices.

Ivanov YP, Chuvilin A, Vivas LG, Kosel J, Chubykalo-Fesenko O, Vázquez M - Sci Rep (2016)

(a) A tomographic image of the section of the NW array presented in Fig. 3 and (b) the calculated ground state of magnetization (colors correspond to the in-plane component of magnetization and lines correspond to the B⊥).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4814901&req=5

f7: (a) A tomographic image of the section of the NW array presented in Fig. 3 and (b) the calculated ground state of magnetization (colors correspond to the in-plane component of magnetization and lines correspond to the B⊥).
Mentions: We used tomographic data (see Fig. 7a) to run micromagnetic simulations on the part of the array presented in Fig. 3 to account for the magnetostatic interaction between NWs in the array and to define the true shape of NWs. As shown in Fig. 7b, NWs can present either vortex or parallel magnetization states, which agrees well with experimental data (Fig. 3).

Bottom Line: Magnetic vortex-based media have recently been proposed for several applications of nanotechnology; however, because lithography is typically used for their preparation, their low-cost, large-scale fabrication is a challenge.In this work, we present this type of nanoscale magnetic structures that can hold multiple stable magnetic vortex domains at remanence with different chiralities.The data we present here introduce a route toward the concept of 3-dimensional vortex-based magnetic memories.

View Article: PubMed Central - PubMed

Affiliation: King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.

ABSTRACT
Magnetic vortex-based media have recently been proposed for several applications of nanotechnology; however, because lithography is typically used for their preparation, their low-cost, large-scale fabrication is a challenge. One solution may be to use arrays of densely packed cobalt nanowires that have been efficiently fabricated by electrodeposition. In this work, we present this type of nanoscale magnetic structures that can hold multiple stable magnetic vortex domains at remanence with different chiralities. The stable vortex state is observed in arrays of monocrystalline cobalt nanowires with diameters as small as 45 nm and lengths longer than 200 nm with vanishing magnetic cross talk between closely packed neighboring wires in the array. Lorentz microscopy, electron holography and magnetic force microscopy, supported by micromagnetic simulations, show that the structure of the vortex state can be adjusted by varying the aspect ratio of the nanowires. The data we present here introduce a route toward the concept of 3-dimensional vortex-based magnetic memories.

No MeSH data available.


Related in: MedlinePlus