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Mohanta SK, Mishra SN, Davane SM, et al. Defect induced magnetism in highly oriented pyrolytic graphite: bulk magnetization and 19F hyperfine interaction studies. J Phys Condens Matter. 2012;24(8):085601doi: 10.1088/0953-8984/24/8/085601.
Mohanta, S. K., Mishra, S. N., Davane, S. M., & Srivastava, S. K. (2012). Defect induced magnetism in highly oriented pyrolytic graphite: bulk magnetization and 19F hyperfine interaction studies. Journal of physics. Condensed matter : an Institute of Physics journal, 24(8), 085601. https://doi.org/10.1088/0953-8984/24/8/085601
Mohanta, S K, et al. "Defect induced magnetism in highly oriented pyrolytic graphite: bulk magnetization and 19F hyperfine interaction studies." Journal of physics. Condensed matter : an Institute of Physics journal vol. 24,8 (2012): 085601. doi: https://doi.org/10.1088/0953-8984/24/8/085601
Mohanta SK, Mishra SN, Davane SM, Srivastava SK. Defect induced magnetism in highly oriented pyrolytic graphite: bulk magnetization and 19F hyperfine interaction studies. J Phys Condens Matter. 2012 Feb 29;24(8):085601. doi: 10.1088/0953-8984/24/8/085601. Epub 2012 Jan 26. PMID: 22277293.
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J Phys Condens Matter. 2012 Feb 29;24(8):085601. doi: 10.1088/0953-8984/24/8/085601. Epub 2012 Jan 26.

Defect induced magnetism in highly oriented pyrolytic graphite: bulk magnetization and 19F hyperfine interaction studies.

Journal of physics. Condensed matter : an Institute of Physics journal

S K Mohanta, S N Mishra, S M Davane, S K Srivastava

Affiliations

  1. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai, India.

PMID: 22277293 DOI: 10.1088/0953-8984/24/8/085601

Abstract

We have made bulk and local investigations on defect induced magnetism in highly oriented pyrolytic graphite (HOPG) irradiated with a 40 MeV carbon beam. The local magnetic response of irradiated HOPG was studied by measuring the hyperfine field of recoil implanted (19)F using γ-ray time differential perturbed angular distribution (TDPAD) measurements. While the bulk magnetic properties of the irradiated sample show features characteristic of room temperature ferromagnetism, the hyperfine field data reflect enhanced paramagnetism with no indication of long range magnetic ordering. The experimental studies are further supported by ab initio density functional calculations. We believe that the ferromagnetic response in irradiated HOPG arises mostly from defect induced magnetic moments of carbon atoms in the near surface region, while those deep inside the host matrix remain paramagnetic.

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