Highly ordered Co2MnSn full Heusler alloy nanowire (NW) arrays were for the first time electrochemically synthesized into an anodic aluminum oxide (AAO) template. In order to obtain the full Heusler alloy composition (2:1:1) in NWs, the sinusoidal waveform of different voltages was applied during electrodeposition. Elemental analysis exhibited that Co0.48Mn0.25Sn0.26 and Co0.49Mn0.26Sn0.24 NWs were successfully synthesized at 16 V and 17 V, where the nominal composition ratio of Co:Mn:Sn was equal to Co2MnSn full Heusler alloys composition. The crystal structure demonstrated that Heusler NWs were crystallized into an A2-type magnetically disordered structure with an average lattice constant of ∼5.83 Å. The magnetization behavior of NWs predicated that the easy axis was along the wire long axis due to the dominance of shape anisotropy. An average saturation magnetization (Ms) and coercivity (Hc) along the easy axis of Heusler NWs was obtained at about ∼2500 emu/cm3 and ∼440 Oe, respectively. The difference between total effective anisotropy energy (Keff) and magnetostatic anisotropy energies (Kms) illustrated that the magnetic anisotropy in Co0.49Mn0.26Sn0.24 NWs was also mainly contributed by magnetocrystalline anisotropy. Furthermore, the angular dependence of Hc revealed that the magnetization reversal mode in Heusler NWs existed on the vortex mode and transversal mode at low and high angles, respectively.

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