Co-based full heusler alloy nanowires: Modulation of static and dynamic properties through deposition parameters

In this work, a successful fabrication of Co2MnAl heusler alloy nanowires in anodic alumina templates has been demonstrated using simple and low-cost electro-deposition technique at room temperature. The role of deposition parameters, such as pH of the electrolyte solution were investigated on the structural and magnetic properties of Co2MnAl nanowires. It is observed that the crystallinity improves with the increase of pH of the solution till around pH=3.0 where the best crystallinity is achieved. The X-Ray diffraction pattern confirms the formation of B2 crystal type in the Co2MnAl heusler alloys which is further verified by high-resolution transmission electron microscope images. The static magnetic properties were explored by the VSM analysis which revealed that the saturation magnetization, squareness, coercivity and uniaxial anisotropy of the nanowires increase with the increase in pH value. The highest remanent squareness of 76% is observed for pH=2.9. The dynamic measurements of heusler alloy nanowires have been studied by ferromagnetic resonance technique using the flip-chip method in the field-sweep mode at different applied frequencies ranging from 20-40 GHz. It is observed that the resonance field increases linearly with the increase in frequency for all samples. Further, the resonance field decreases up to 35% with the increase of pH value of electrolyte, resulting in an increase in the effective field.