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The local chemistry, structure, and magnetism of (Ga,Fe)N nanocompositesgrown by metal organic vapor phase epitaxy is studied by high resolutionsynchrotron x-ray diffraction and absorption, transmission electron microscopy,and superconducting quantum interference device magnetometry as a function ofthe growth temperature $T_{\mathrm{g}}$. Three contributions to themagnetization are identified: i) paramagnetic -- originating from dilute andnon-interacting Fe$^{3+}$ ions substitutional of Ga, and dominating in layersobtained at the lowest considered $T_{\mathrm{g}}$ (800$^{\circ}$C); ii)superparamagnetic-like -- brought about mainly by ferromagnetic nanocrystals of$\epsilon-$Fe$_3$N but also by $\gamma'$-Fe$_4$N and by inclusions of elemental$\alpha$- and $\gamma$-Fe, and prevalent in films obtained in the intermediate$T_{\mathrm{g}}$ range; iii) component linear in the magnetic field andassociated with antiferromagnetic interactions -- found to originate fromhighly nitridated Fe$_x$N ($x \leq$ 2) phases, like $\zeta$-Fe$_2$N, anddetected in samples deposited at the highest employed temperature,$T_{\mathrm{g}}$ = 950$^{\circ}$C. Furthermore, depending on $T_{\mathrm{g}}$,the Fe-rich nanocrystals segregate towards the sample surface or occupytwo-dimensional planes perpendicular to the growth direction.

Embedded magnetic phases in (Ga,Fe)N: the key role of growth temperature