Room-temperature ferromagnetism in graphitic petal arrays

Chandra Sekhar Rout, Purdue University
Anurag Kumar, Purdue University - Main Campus
Nitesh Kumar, Jawaharlal Nehru Centre for Advanced Scientific Research
A. Sundaresan, Jawaharlal Nehru Centre for Advanced Scientific Research
Timothy S. Fisher, Purdue University

Date of this Version

2011

Citation

DOI: 10.1039/c0nr00870b

Abstract

We report room-temperature ferromagnetism of graphitic petal arrays grown on Si substrates by microwave plasma chemical vapor deposition without catalyst. The samples have been characterized by Raman and X-ray photoelectron spectroscopy to confirm the absence of possible ferromagnetic impurities. The petals exhibit ferromagnetic hysteresis with saturation magnetization of similar to 4.67 emu cm(-3) and coercivity of similar to 105 Oe at 300 K, comparable to the reported behavior of few-layer graphene. Upon O(2) annealing the saturation magnetization and coercivity decreased to 2.1 emu cm(-3) and similar to 75 Oe respectively. The origin of ferromagnetism is believed to arise from the edge defects and vacancies in the petals.

Discipline(s)

Nanoscience and Nanotechnology

 

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