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Investigation of γ′-Fe4N−GaN Nanocomposites: Structural and Magnetic Characterization, Mössbauer Spectroscopy and Ab Initio Calculations

“…FeI and FeIIc hyperfine fields (36 and 23 T) are shared between the γ′-Fe 4 N and Fe 4− x Ga x N phases; the other maxima (15, 19 T) can be ascribed to the FeIIb and FeIIa sites in the mixed Ga-substituted iron nitride. The maxima observed at around 3 and 8.5 T may be associated with the existence of (i) Fe doped into the GaN matrix; (ii) the remaining superparamagnetic phases magnetically disordered, even at 5 K; or (iii) nonstoichiometric pure or (iv) other substituted iron nitrides. It is worth mentioning that hyperfine distributions can be qualitatively reproduced considering the weight percentages obtained from the XRD results (Table ), together with the relative fractions of the different iron sites in the superlattices used for the calculations (Table ).…”

Investigation on the structure and magnetic properties at low temperature for nanocrystalline γ′-Fe4N thin films

“…Iron nitride films have received many attentions because of their excellent magnetic properties [1][2][3][4][5][6][7][8][9][10][11] and their ability to improve surface hardness and wear resistance [12] for application in magnetic devices. It is well known that some iron nitrides such as -Fe 3 N (hcp), ␥ -Fe 4 N (fcc) and ␣ -Fe 16 N 2 (bct) are magnetic phases [13][14][15].…”