Magnetism in ${\mathrm{C}}_{60}$ films induced by proton irradiation

Magnetism in $C_{60}$ films induced by proton irradiation

S. Mathew, B. Satpati, B. Joseph, B. N. Dev, R. Nirmala, S. K. Malik, and R. Kesavamoorthy

Phys. Rev. B 75, 075426 – Published 27 February 2007

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.

Received 3 June 2006

DOI:https://doi.org/10.1103/PhysRevB.75.075426

Authors & Affiliations

S. Mathew, B. Satpati, and B. Joseph

Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India

B. N. Dev^*

Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India and Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolokata 700 032, India

R. Nirmala and S. K. Malik^†

Tata Institute of Fundamental Research, Mumbai 400 005, India

R. Kesavamoorthy

Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India

^*Electronic address: bhupen@iopb.res.in; msbnd@iacs.res.in
^†Present address: International Center for Condensed Matter Physics (ICCMP), University of Brasilia, 70904–970 Brasilia DF, Brazil.

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Vol. 75, Iss. 7 — 15 February 2007

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Physical Review B

covering condensed matter and materials physics

Magnetism in $C_{60}$ films induced by proton irradiation

S. Mathew, B. Satpati, B. Joseph, B. N. Dev, R. Nirmala, S. K. Malik, and R. Kesavamoorthy

Phys. Rev. B 75, 075426 – Published 27 February 2007

Abstract

Authors & Affiliations

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Physical Review B

covering condensed matter and materials physics

Magnetism in C60 films induced by proton irradiation

S. Mathew, B. Satpati, B. Joseph, B. N. Dev, R. Nirmala, S. K. Malik, and R. Kesavamoorthy

Phys. Rev. B 75, 075426 – Published 27 February 2007

Abstract

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Magnetism in $C_{60}$ films induced by proton irradiation