Magnetic properties of graphite irradiated with MeV ions

Ramos, M A; Munoz-Martin, A; Climent-Font, A; Barzola-Quiquia, J; Esquinazi, P; Garcia-Hernandez, M

doi:10.1103/PHYSREVB.81.214404

Title: Magnetic properties of graphite irradiated with MeV ions

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Abstract

We have studied the change in the magnetic properties produced on highly oriented pyrolytic graphite samples by irradiation of H, C, and N ions in the mega-electron-volt energy range. The use of specially made sample holders for the magnetic measurements provided high reproducibility allowing us to obtain directly the irradiation effects without any corrections or subtractions. Our results show that three magnetic phenomena are triggered by the defects produced by the irradiation, namely, Curie-type paramagnetism, ferromagnetism and an anomalous paramagnetic state that appears as precursor of the magnetic ordered state. Using SRIM simulations to estimate the amount of vacancies produced by the irradiation, the Curie-type paramagnetic response indicates an effective Bohr magneton number per nominally produced vacancy p=0.27+-0.02mu{sub B}. Direct measurements of the surface sample temperature during irradiation and the decrease in the (as-received) paramagnetic as well as ferromagnetic contributions after irradiation indicate that self-heating is one of the causes for small yield of ferromagnetism. Taking into account the hydrogen distribution in the virgin samples, the obtained results indicate that the induced ferromagnetism appears when the average vacancy distance is {approx}2 nm in the near surface region.

Authors:

Ramos, M A; Munoz-Martin, A; Climent-Font, A ^[1]; Barzola-Quiquia, J; Esquinazi, P ^[2]; Garcia-Hernandez, M ^[3]

CMAM and Instituto de Ciencia de Materiales 'Nicolas Cabrera', Universidad Autonoma de Madrid, Cantoblanco, E-28049 Madrid (Spain)
Division of Superconductivity and Magnetism, Institut fuer Experimentelle Physik II, Universitaet Leipzig, Linnestrasse 5, D-04103 Leipzig (Germany)
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid (Spain)

Publication Date:: Tue Jun 01 00:00:00 EDT 2010

OSTI Identifier:: 21386736

Resource Type:: Journal Article

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 81; Journal Issue: 21; Other Information: DOI: 10.1103/PhysRevB.81.214404; (c) 2010 The American Physical Society; Journal ID: ISSN 1098-0121

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CORRECTIONS; CRYSTAL DEFECTS; DISTANCE; DISTRIBUTION; ELECTRONS; FERROMAGNETISM; GRAPHITE; HEATING; HYDROGEN; IRRADIATION; MAGNETIC PROPERTIES; MEV RANGE; NITROGEN IONS; PARAMAGNETISM; PRECURSOR; SAMPLE HOLDERS; SIMULATION; SURFACES; CARBON; CHARGED PARTICLES; CRYSTAL STRUCTURE; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; FERMIONS; IONS; LEPTONS; MAGNETISM; MINERALS; NONMETALS; PHYSICAL PROPERTIES

Citation Formats


                    Ramos, M A, Munoz-Martin, A, Climent-Font, A, Barzola-Quiquia, J, Esquinazi, P, and Garcia-Hernandez, M. Magnetic properties of graphite irradiated with MeV ions.  United States: N. p., 2010. 
        Web.  doi:10.1103/PHYSREVB.81.214404.

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                    Ramos, M A, Munoz-Martin, A, Climent-Font, A, Barzola-Quiquia, J, Esquinazi, P, & Garcia-Hernandez, M. Magnetic properties of graphite irradiated with MeV ions.  United States.  https://doi.org/10.1103/PHYSREVB.81.214404

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                    Ramos, M A, Munoz-Martin, A, Climent-Font, A, Barzola-Quiquia, J, Esquinazi, P, and Garcia-Hernandez, M. 2010.  
        "Magnetic properties of graphite irradiated with MeV ions".  United States.  https://doi.org/10.1103/PHYSREVB.81.214404.

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@article{osti_21386736,

  title        = {Magnetic properties of graphite irradiated with MeV ions},

  author       = {Ramos, M A and Munoz-Martin, A and Climent-Font, A and Barzola-Quiquia, J and Esquinazi, P and Garcia-Hernandez, M},

  abstractNote = {We have studied the change in the magnetic properties produced on highly oriented pyrolytic graphite samples by irradiation of H, C, and N ions in the mega-electron-volt energy range. The use of specially made sample holders for the magnetic measurements provided high reproducibility allowing us to obtain directly the irradiation effects without any corrections or subtractions. Our results show that three magnetic phenomena are triggered by the defects produced by the irradiation, namely, Curie-type paramagnetism, ferromagnetism and an anomalous paramagnetic state that appears as precursor of the magnetic ordered state. Using SRIM simulations to estimate the amount of vacancies produced by the irradiation, the Curie-type paramagnetic response indicates an effective Bohr magneton number per nominally produced vacancy p=0.27+-0.02mu{sub B}. Direct measurements of the surface sample temperature during irradiation and the decrease in the (as-received) paramagnetic as well as ferromagnetic contributions after irradiation indicate that self-heating is one of the causes for small yield of ferromagnetism. Taking into account the hydrogen distribution in the virgin samples, the obtained results indicate that the induced ferromagnetism appears when the average vacancy distance is {approx}2 nm in the near surface region.},

  doi          = {10.1103/PHYSREVB.81.214404},

  url          = {https://www.osti.gov/biblio/21386736},
  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  issn         = {1098-0121},

  number       = 21,

  volume       = 81,

  place        = {United States},

  year         = {Tue Jun 01 00:00:00 EDT 2010},

  month        = {Tue Jun 01 00:00:00 EDT 2010}

}

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