Patterning Graphitic C-N Sheets into a Kagome Lattice for Magnetic Materials.
We propose porous C-N-based structures for biocompatible magnetic materials that do not contain even a single metal ion. Using first-principles calculations based on density functional theory, we show that when patterned in the form of a kagome lattice, nonmagnetic g-C3N4 not only becomes ferromagnetic but also its magnetic properties can be further enhanced by applying external strain. Similarly, the magnetic moment per atom in ferromagnetic g-C4N3 is increased three fold when patterned into a kagome lattice. The Curie temperature of g-C3N4 kagome lattice is 100 K, while that of g-C4N3 kagome lattice is much higher, namely, 520 K. To date, all of the synthesized two- and three-dimensional magnetic kagome structures contain metal ions and are toxic. The objective of our work is to stimulate an experimental effort to develop nanopatterning techniques for the synthesis of g-C3N4- and g-C4N3-based kagome lattices.
Xiaowei
X
Li
Jian
J
Zhou
§Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States.
Qian
Q
Wang
⊥Institute for Material Research, Tohoku University, Sendai 980-8577, Japan.
Yushiyuki
Y
Kawazoe
§Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States.
Puru
P
Jena
graphitic material; kagome lattice; magnetism; nanopatterning; single atomic porous sheet