“…Since the first report on the possible 'giant-moment' ␣ -Fe 16 N 2 phase by Kim and Takahashi, ferromagnetic iron nitride compounds, such as ␣-Fe (N), -Fe 3 N (hcp), ␥ -Fe 4 N (fcc), and ␣ -Fe 16 N 2 (bct), have been intensively investigated [9][10][11][12][13][14][15][16][17]. Recently, synthesis and characterization of nanocrystalline iron nitride have been attracting widespread attention because of their unique magnetic properties and the improved performances determined by their particle sizes, surface structures and inter-particle interaction [18][19][20][21][22][23][24][25].…”