Irreversible magnetic properties of carbon nanoparticles

Lähderanta, E.; Lashkul, A.; Лисунов, K. Г.; Жеребцов, Д. А.; Галимов, Д. М.; Titkov, A. N.

doi:10.1051/epjconf/20134008008

Cited by 4 publications

(10 citation statements)

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“…Magnetic behavior of the Au-doped sample gives evidence for presence of a short-range FM order near the room temperature. Taking into account the observed amorphous structure of the Au-doped sample, this implies formation of FM nanoparticles at higher temperatures in agreement with the results of [11][12][13]. However, a subsystem of paramagnetic (PM) centers (referred below as "matrix"), not involved in formation of the FM clusters, have been found in the Au-doped sample on cooling.…”

Section: Introductionsupporting

confidence: 89%

“…The porous glassy carbon samples doped with 0.004 mass % of Au (S-Au) and with 0.117 mass % of Co (S-Co), which have been prepared and studied earlier in [11][12][13], were investigated. The preparation details have been described in Refs.…”

Section: Methodsmentioning

confidence: 99%

“…Magnetic properties of powder and glassy carbon-based nanomaterials, including those doped with metals, have been investigated recently [11][12][13], remaining, however, many important details unclear. These include a structure and a local structure of the compounds, a character of the FM ordering, a possible similarity of the local structure to that of fullerenes or other carbon-based materials and, eventually, distribution of the magnetization over the sample volume.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we have studied two carbon-based compounds doped by Au and Co (note that Au is nonmagnetic, whereas Co ions may possess a local magnetic moment), which are similar to the Au-doped and Co-doped samples, respectively, investigated in [11][12][13]. We have obtained information on their structural and magnetic properties, using several independent methods to clarify some of the issues mentioned above.…”

Section: Introductionmentioning

confidence: 99%

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Unusual scenario of the temperature evolution of magnetic state in novel carbon-based nanomaterials

Ryzhov,

Lashkul,

Matveev

et al. 2014

Preprint

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Two porous carbon-based samples doped with Au and Co, respectively, are investigated. The neutron diffraction study reveals an amorphous structure of both samples. The Co-doped sample contains structural clusters with larger size and exhibits a long-range ferromagnetic (FM) ordering at 2.6 K. The NMR investigations demonstrate, that the samples are obtained with a partial carbonization of initial aromatic compounds and do not reach a state of glassy carbon. The magnetization study, as well as investigations of a longitudinal nonlinear response to a weak ac field and electron magnetic resonance, gives evidences for presence of FM clusters in the samples already at temperatures well above 300 K. A short-range character of the FM ordering in the Au-doped sample transforms below T C ≈ 210 K into another inhomogeneous FM state. Besides the FM clusters, this state contains a subsystem with a long-range FM ordering (matrix) formed by paramagnetic centers, existing outside the clusters. The nonlinear response data suggest a percolative character of the long-range FM matrix, which is connected probably with a porous

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Section: Introductionsupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unusual scenario of the temperature evolution of magnetic state in novel carbon-based nanomaterials

Ryzhov,

Lashkul,

Matveev

et al. 2014

Preprint

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“…Magnetic properties of carbon-based materials which are metal-free or containing only negligible amounts of metallic impurities are known fact that attract attention and reported elsewhere [15]. Ferromagnetic behaviour of such carbons are demonstrated even above room temperature.…”

Section: Introductionmentioning

confidence: 99%

Self-assemblying behaviour of activated microporous carbon microspheres functionalized via water filtration process

2020

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Activated carbon spheres are truly innovative materials with their porous micro/nanostructure that gives them tunable and controllable surface properties (i.e. high surface area, size and orientation of pores etc.). They have great potential for applications as adsorbents for cleaning/purification of water, air and chemical substances, catalyst supports, energy storage and conversion, adsorption of chemical warfare agents, filtration and others. Magnetic functionalization of highly porous and high surface areas of activated carbons have received considerable attention for their more sophisticated and advanced utilization as "smart" and "self-assemblying" purposes. In this study, a novel fabrication technique was used to synthesize activated high compressive strength nanoporous carbon spheres. The functionalization via adsorption/ impregnation of magnetic substances was occured during a well-known water treatment-filtering route to fill the pores with nano-sized magnetic particles. Unusually active and dynamic interactions of the magnetic phases were observed upon contacting into each other revealing self-assemblying behaviour of activated carbon microspheres. Dynamic magnetical interaction of self assemblying behaviour of these spheres may have further and advanced applications for variety of purposes.

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Magnetism and spintronics in carbon nanoparticle/fullerene

Ray

2020

Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials

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Irreversible magnetic properties of carbon nanoparticles

Cited by 4 publications

References 0 publications

Unusual scenario of the temperature evolution of magnetic state in novel carbon-based nanomaterials

Unusual scenario of the temperature evolution of magnetic state in novel carbon-based nanomaterials

Self-assemblying behaviour of activated microporous carbon microspheres functionalized via water filtration process

Magnetism and spintronics in carbon nanoparticle/fullerene

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