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Title: Magnetism in C{sub 60} films induced by proton irradiation

Abstract

It is shown that polycrystalline fullerene thin films on hydrogen-passivated Si(111) substrates irradiated by 2 MeV protons display ferromagneticlike behavior at 5 K. At 300 K, both the pristine and the irradiated film show diamagnetic behavior. Magnetization data in the temperature range of 2-300 K in 1 T applied field, for the irradiated film show much stronger temperature dependence compared to the pristine film. Possible origins of ferromagneticlike signals in the irradiated films are discussed.

Authors:
; ; ; ; ; ;  [1];  [2];  [2];  [2]
  1. Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005 (India)
  2. (India)
Publication Date:
OSTI Identifier:
20976706
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevB.75.075426; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; FERROMAGNETIC MATERIALS; FULLERENES; HYDROGEN; IRRADIATION; MAGNETISM; MAGNETIZATION; MEV RANGE 01-10; POLYCRYSTALS; PROTONS; SUBSTRATES; TEMPERATURE DEPENDENCE; THIN FILMS

Citation Formats

Mathew, S., Satpati, B., Joseph, B., Dev, B. N., Nirmala, R., Malik, S. K., Kesavamoorthy, R., Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India and Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Jadavpur, Kolokata 700 032, Tata Institute of Fundamental Research, Mumbai 400 005, and Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102. Magnetism in C{sub 60} films induced by proton irradiation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.075426.
Mathew, S., Satpati, B., Joseph, B., Dev, B. N., Nirmala, R., Malik, S. K., Kesavamoorthy, R., Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India and Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Jadavpur, Kolokata 700 032, Tata Institute of Fundamental Research, Mumbai 400 005, & Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102. Magnetism in C{sub 60} films induced by proton irradiation. United States. doi:10.1103/PHYSREVB.75.075426.
Mathew, S., Satpati, B., Joseph, B., Dev, B. N., Nirmala, R., Malik, S. K., Kesavamoorthy, R., Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India and Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Jadavpur, Kolokata 700 032, Tata Institute of Fundamental Research, Mumbai 400 005, and Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102. 2007. "Magnetism in C{sub 60} films induced by proton irradiation". United States. doi:10.1103/PHYSREVB.75.075426.
@article{osti_20976706,
title = {Magnetism in C{sub 60} films induced by proton irradiation},
author = {Mathew, S. and Satpati, B. and Joseph, B. and Dev, B. N. and Nirmala, R. and Malik, S. K. and Kesavamoorthy, R. and Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India and Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Jadavpur, Kolokata 700 032 and Tata Institute of Fundamental Research, Mumbai 400 005 and Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102},
abstractNote = {It is shown that polycrystalline fullerene thin films on hydrogen-passivated Si(111) substrates irradiated by 2 MeV protons display ferromagneticlike behavior at 5 K. At 300 K, both the pristine and the irradiated film show diamagnetic behavior. Magnetization data in the temperature range of 2-300 K in 1 T applied field, for the irradiated film show much stronger temperature dependence compared to the pristine film. Possible origins of ferromagneticlike signals in the irradiated films are discussed.},
doi = {10.1103/PHYSREVB.75.075426},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 7,
volume = 75,
place = {United States},
year = 2007,
month = 2
}
  • Molybdenum disulphide, a diamagnetic layered dichalcogenide solid, is found to show magnetic ordering at room temperature when exposed to a 2 MeV proton beam. The temperature dependence of magnetization displays ferrimagnetic behavior with a Curie temperature of 895 K. A disorder mode corresponding to a zone-edge phonon and a Mo valence higher than +4 has been detected in the irradiated samples using Raman and x-ray photoelectron spectroscopy, respectively. The possible origins of long-range magnetic ordering in irradiated MoS{sub 2} samples are discussed.
  • The swift heavy ion (SHI) irradiation induces weak ferrimagnetism (FM) in magnetically frustrated polycrystalline BiMn{sub 2}O{sub 5} thin films. This is manifested from irradiation induced higher energetic configuration that accounts for evolution of the Mn{sup 2+} state in the Mn{sup 3+}/Mn{sup 4+} network. Basically, this is the root of large magnetic moment in the irradiated samples. X-ray diffraction and Raman-scattering data of the samples indicate considerable modifications in the crystal structure after the SHI irradiation. FM in the irradiated samples and magnetically frustrated behavior of the pristine sample is apparent from dc magnetization measurements. Element specific characterizations such as near-edgemore » x-ray absorption fine structure spectroscopy at O K and Mn L{sub 3,2} edges along with x-ray magnetic circular dichroism at Mn L{sub 3,2} edge show the evolution of the Mn{sup 2+} at disbursement of the Mn{sup 4+}. The microscopic origin behind the induced weak FM is found to be the increased orbital moment in the irradiated thin films.« less
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