Influence of various substrate materials on the structure and magnetic properties of Fe–N thin films deposited by DC magnetron sputtering

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

“…In other words, the disordered moments at the grain boundaries and film surface were frozen at the low temperatures so that the relative large Hc appears due to the pinning effect of the moments [3,18]. Further, based on the Bloch's spin wave theory, Ms will satisfy the following relation [17,19],…”

“…Due to the neglect of the interaction between the spin waves, formula (2) can be used to fit the experimental data in the low-temperature range. After that, this formula was modified by considering the scattering between the spin waves, as following [17,19],…”

“…Among them, single face γ 0 -Fe 4 N films have been obtained on different substrates such as Si (1 0 0), NaCl(1 0 0), Cu(1 0 0), MgO(0 0 1) and SrTiO 3 (0 0 1) substrates [5,[15][16]. Recently, Wang et al [17][18][19] investigated the influence of substrate materials such as NaCl(1 0 0), Si(1 0 0) and glass on the magnetic properties of γ 0 -Fe 4 N thin films. They found that Ms of the films on different substrates had almost the same value, but Hc of the films was different between single-crystal substrate and amorphous substrate.…”

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

“…Yamaguchi et al [25] have synthesized a single ␥ -Fe 4 N phase by nitrifying iron thin film in ammonia-hydrogen gas. In our previous work [26], the single-phase ␥ -Fe 4 N magnetic films have also been acquired by magnetron sputtering. However, so far, there have been few reports about the magnetic properties at low temperature for ␥ -Fe 4 N films, in particular, for the nanocrystalline ␥ -Fe 4 N films.…”

Effect of Ni concentration on the structure and magnetic properties for nanocrystalline Fe–Ni–N thin films

“…The ␥ -Fe 4 N phase has the face-centered cubic iron lattice with a nitrogen atom positioned at the body-center site, a better chemical stability which has been considered to be a potential candidate for a high-density recording material [10][11][12]. Up to now, how to obtain a single-phase ␥ -Fe 4 N has been concentrated on [13][14][15], including our previous work [16], in which the singlephase ␥ -Fe 4 N magnetic films have successfully been obtained by magnetron sputtering. However, Fe-N films show a high magnetostriction and poor thermal stability, and their good soft magnetic properties disappear with increasing annealing temperature owing to the grain growth of the refined iron.…”