Smooth, crack free and highly uniform Fe₃Ga nanowire (NW) arrays.

Annealing temperature guided from A2-disorderd to ordered and stable L1₂ phase.

K_eff > 0 shows, the easy axis of magnetization is parallel to the wire axis.

Annealing treatment enhanced the magnetic properties of Fe₃Ga NWs.

The temperature dependence of coercivity follows a mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0925838816326408&_mathId=si1.gif&_user=111111111&_pii=S0925838816326408&_rdoc=1&_issn=09258388&md5=841ac8e58df1f94bc27ed27738c73f37">mage" height="30" width="10" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0925838816326408-si1.gif">mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll">32math> power law.