Impact of aligned carbon nanotubes array on the magnetostatic isolation of closely packed ferromagnetic nanoparticles

Danilyuk, A. L.; Kukharev, A. V.; Cojocaru, Costel Sorin; Normand, F. Le; Prischepa, S. L.

doi:10.1016/j.carbon.2018.08.024

Cited by 9 publications

(12 citation statements)

References 69 publications

(65 reference statements)

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“…As clearly demonstrated by Danilyuk [2018], by atomic-force microscopy (AFM), and magnetic-force microscopy (MFM), Co NPs on the Si/SiO 2 substrate are strongly coupled forming large magnetic domains each of which contains about 100 NPs. MFM images of Co NPs on the top of CNTs revealed a unique correlation between the geometrical sizes of particles and the size of magnetic domains, each NP corresponding to a single domain [Danilyuk 2018]. For Co-based binary compounds, the result is similar.…”

Section: Resultsmentioning

confidence: 99%

“…This causes higher squareness M R / M S for the perpendicular field. The extracted from the M(H) curves parameters for binary metal NPs together with the data for Co [Danilyuk 2018] are presented in Table 1. It is seen that for CoPt, coercivity reaches the maximum values.…”

Section: Resultsmentioning

confidence: 99%

“…On the basis of the obtained K eff values, and taking advantage of the fact that for NPs on the substrate (before the CNT growth) magnetoelasticity and shape anisotropy can be neglected, it is possible to evaluate the contributions of all components (K MC , K S , K ME , dipole interaction K DD ) to the magnetic anisotropy. This approach is described in detail by Danilyuk [2018]. Here, we should only emphasize that the K MC value that was previously estimated for NPs on Si/SiO 2 substrate was supposed to be the same for NPs after the CNT growth.…”

Section: Resultsmentioning

confidence: 99%

“…The obtained array of metallic NPs was afterward used for the CNT growth. It was possible to analyze samples by X-ray photoelectron spectroscopy (XPS) at each step of the fabrication process without exposure to air [Le Normand 2007, Danilyuk 2018]. In Fig.…”

Section: Samplesmentioning

confidence: 99%

“…For that, we inject into the reactor the mixture of H 2 (80%) and C 2 H 2 (20%) at P = 15 mbar activated by current discharge plasma and hot filament. More details about this technique can be found in Cojocaru [2006] and Danilyuk [2018]. In the XPS survey spectrum after the CNT growth, a noticeable peak C1s of carbon appears.…”

Section: Samplesmentioning

confidence: 99%

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Anisotropy of Assemblies of Densely Packed Co-Alloy Nanoparticles Embedded in Carbon Nanotubes

et al. 2019

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We report on the magnetic properties of an array of binary metal CoFe, CoNi, and CoPt nanoparticles (NPs) embedded inside vertically oriented carbon nanotubes (CNTs). Samples were synthesized by chemicalvapor deposition activated by current discharge plasma and hot filaments. Assemblies of Co-based catalytic NPs were prepared on SiO 2 /Si substrates by sputtering ultrathin films followed by reduction in an H 2 /NH 3 mixture. As a result of the CNT growth, each CNT contained only one ferromagnetic NP located at the top. For all samples, the easy axis of magnetization was along the CNT axis. The magnetic parameters, including effective anisotropy constant and the contributions of dipole interactions and shape, magnetocrystalline, and magnetoelastic anisotropies, were estimated based on the experimental data and a random-anisotropy model. The magnetoelastic contribution was decisive. From the magnetoelasticity, the stresses in the NPs embedded in the CNTs were determined. Finally, the magnetization distribution in CoFe, CoNi, and CoPt NPs was simulated considering the magnetoelastic contribution.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

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Anisotropy of Assemblies of Densely Packed Co-Alloy Nanoparticles Embedded in Carbon Nanotubes

et al. 2019

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Magnetic Properties of 1D Iron–Sulfur Compounds Formed Inside Single‐Walled Carbon Nanotubes

Окотруб

Chernov

Лавров

et al. 2020

Physica Rapid Research Ltrs

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Carbon-encapsulated magnetic nanoparticles are very prospective in the context of biomedical applications, [1] memory devices, [2] and magnetic sensors. [3] Singlewalled carbon nanotubes (SWCNTs) stand out among other different protective materials. They not only serve as a template for nano-dimensional growth [4] and promote interactions between the encapsulated species, but also can influence the properties of the formed host-guest structures. [5-7] Indeed, the SWCNT ensures a fine dispersion of magnetic species along the longitudinal axis, thus restricting the magnetic coupling between them and thereby enhancing the inherent properties of nanoparticles. [8-11] A reduction of intermolecular dipole-dipole interactions between the neighboring encapsulated molecules leading to enhanced magnetic properties was recently demonstrated for single-molecule magnets. [12] The 1D arrangement of singlemolecule magnets provides the suppression of quantum tunneling of the magnetization [12,13] that is crucial for practical applications. Initially, filling of nanotubes with magnetic species was studied for cobalt, [8,14,15] iron, [9,10,16-18] and nickel [19] nanoparticles. These metals are frequently used as catalysts for the growth of nanotubes [20] and often detected as side

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Low-temperature magnetic ordering in Co core/CoO shell nanoparticles on the copper surface

Danilyuk,

Nazarenka,

Vorobyova

et al. 2023

Current Applied Physics

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Impact of aligned carbon nanotubes array on the magnetostatic isolation of closely packed ferromagnetic nanoparticles

Cited by 9 publications

References 69 publications

Anisotropy of Assemblies of Densely Packed Co-Alloy Nanoparticles Embedded in Carbon Nanotubes

Anisotropy of Assemblies of Densely Packed Co-Alloy Nanoparticles Embedded in Carbon Nanotubes

Magnetic Properties of 1D Iron–Sulfur Compounds Formed Inside Single‐Walled Carbon Nanotubes

Low-temperature magnetic ordering in Co core/CoO shell nanoparticles on the copper surface

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