Increased magnetic moment induced by lattice expansion from α-Fe to α-Fe₈N

Investigation of γ′-Fe4N thin films deposited on Si(1 0 0) and GaAs(1 0 0) substrates by facing target magnetron sputtering

“…In that case, we could distinguish the relative contributions of the substrate and the buffer Fe layer. It is worth noting that both the films on Si and GaAs substrates present a soft ferromagnetism with a small coercivity (Hc), although the values of Ms were different by 240725 emu/cm 3 at 300 K. As seen from the figures, Ms is estimated about 1444 725 emu/cm 3 which is in good agreement with previously reported values [9,13], and…”

“…Compared to other iron nitride phases, it is especially one of the remarkable soft magnetic materials because of the high magnetic moments, which makes it more interesting from a magnetic application point of view. Accordingly, numerous reports can be found in literatures on the growth and characterization of it by virtue of its high spin polarization, high Curie temperature, high saturation magnetization and low coercivity in combination with a significantly improved corrosion and wear resistance [4][5][6][7][8][9][10][11][12][13][14]. In the case of thin films, the role of substrates is very important because it can limit the growth direction and microstructure.…”

A review of high magnetic moment thin films for microscale and nanotechnology applications

“…The average magnetic moment of Fe in these experiments was mostly higher than the bulk BCC Fe moment, but nowhere near a "giant" moment. As one of the most recent investigations of FeN thin films fabricated by reactive sputtering, Dirba et al 259 also reported a moderate moment increase; however, the authors explicitly state that it has nothing to do with the formation of a 00 Fe 16 N 2 but simply lattice expansion due to N 2 inclusion 287 as shown in Fig. 18(a) (in agreement with a similar earlier study by Kusumi et al 243 ).…”

Nanoscale Iron Nitride, ε-Fe3N: Preparation from Liquid Ammonia and Magnetic Properties

“…9,11 Physical methods such as reactive sputtering lead to thin films. 12,13 Liquid ammonia is an exotic but versatile solvent that can be used in organic and inorganic reactions. [14][15][16] Its ability to dissolve alkaline and alkaline earth metals makes it especially interesting for reduction reactions.…”