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We studied the structural and magnetic properties of \textit{in-situ} growniron mononitride (FeN) thin films. Initial stages of film growth were trappedutilizing synchrotron based soft x-ray absorption near edge spectroscopy(XANES) at the N $K$-edge and nuclear resonant scattering (NRS). Films weregrown using dc-magnetron sputtering, separately at the experimental stations ofSXAS beamline (BL01, Indus 2) and NRS beamline (P01, Petra III). It was foundthat the initial stages of film growth differs from the bulk of it. UltrathinFeN films, exhibited larger energy separation between the t$_{2g}$ and e$_g$features and an intense e$_g$ feature in the N $K$-edge pattern. This indicatesthat a structural transition is taking place from the rock-slat (RS)-type FeNto zinc-blende(ZB)-type FeN when the thickness of films increases beyond 5\,nm.The behavior of such N $K$-edge features correlates very well with theemergence of a magnetic component appearing in the NRS pattern at 100\,K inultrathin FeN films. Combining the \textit{in-situ} XANES and NRS measurements,it appears that initial FeN layers grow in RS-type structure having a magneticground state. Subsequently, the structure changes to ZB-type which is known tobe non-magnetic. Observed results help in resolving the long standing debateabout the structure and the magnetic ground state of FeN.

Magnetism and structure of in-situ grown FeN films studied using N K-edge XAS and nuclear resonance scattering