Unconventional magnetism in all-carbon nanofoam

A. V. Rode; E. G. Gamaly; A. G. Christy; J. G. Fitz Gerald; S. T. Hyde; R. G. Elliman; B. Luther-Davies; A. I. Veinger; J. Androulakis; J. Giapintzakis

doi:10.1103/PhysRevB.70.054407

Unconventional magnetism in all-carbon nanofoam

A. V. Rode^*, E. G. Gamaly, A. G. Christy, J. G. Fitz Gerald, S. T. Hyde, R. G. Elliman, B. Luther-Davies, A. I. Veinger, J. Androulakis, J. Giapintzakis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

264 Citations (Scopus)

Abstract

We report production of nanostructured magnetic carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp² and sp³ bonded carbon atoms. The material is a form of carbon containing graphite-like sheets with hyperbolic curvature, as proposed for "schwarzite." The foam exhibits ferromagnetic-like behavior up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.

Original language	English
Article number	054407
Pages (from-to)	054407-1-054407-9
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.70.054407
Publication status	Published - Aug 2004

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title = "Unconventional magnetism in all-carbon nanofoam",

abstract = "We report production of nanostructured magnetic carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp2 and sp3 bonded carbon atoms. The material is a form of carbon containing graphite-like sheets with hyperbolic curvature, as proposed for {"}schwarzite.{"} The foam exhibits ferromagnetic-like behavior up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.",

author = "Rode, \{A. V.\} and Gamaly, \{E. G.\} and Christy, \{A. G.\} and \{Fitz Gerald\}, \{J. G.\} and Hyde, \{S. T.\} and Elliman, \{R. G.\} and B. Luther-Davies and Veinger, \{A. I.\} and J. Androulakis and J. Giapintzakis",

year = "2004",

month = aug,

doi = "10.1103/PhysRevB.70.054407",

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AU - Rode, A. V.

AU - Gamaly, E. G.

AU - Christy, A. G.

AU - Fitz Gerald, J. G.

AU - Hyde, S. T.

AU - Elliman, R. G.

AU - Luther-Davies, B.

AU - Veinger, A. I.

AU - Androulakis, J.

AU - Giapintzakis, J.

PY - 2004/8

Y1 - 2004/8

N2 - We report production of nanostructured magnetic carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp2 and sp3 bonded carbon atoms. The material is a form of carbon containing graphite-like sheets with hyperbolic curvature, as proposed for "schwarzite." The foam exhibits ferromagnetic-like behavior up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.

AB - We report production of nanostructured magnetic carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp2 and sp3 bonded carbon atoms. The material is a form of carbon containing graphite-like sheets with hyperbolic curvature, as proposed for "schwarzite." The foam exhibits ferromagnetic-like behavior up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.

UR - https://www.scopus.com/pages/publications/37649031922

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DO - 10.1103/PhysRevB.70.054407

M3 - Article

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 5

M1 - 054407

ER -

Unconventional magnetism in all-carbon nanofoam

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