Heusler Alloy Analysis

950 Words4 Pages
Synthesis and Characterization of Iron, Manganese and Tin Based Heusler Alloy Nanowires

Ashwin Suresh
Department of Physics & Nanotechnology, SRM University –Chennai, India

ABSTRCT
The ability of Heusler alloys to show half metallicity at room temperature has made them a widely researched topic in the field of Spintronics. I present here the synthesis of nanowires of an alloy of Iron, manganese, and tin by electrospinning technique. The morphology of the nanowires was identified by Field Emission Scanning Electron Microscopy and crystalline size by X-Ray Diffraction analysis and elemental analysis by Energy-dispersive X-ray spectroscopy (EDX) analysis. The morphologies tend to vary with changes in parameters like electrospinning voltage
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They are mainly ferromagnetic but some of the combination for the alloy show antiferromagnetic and ferrimagnetic properties. The property of double exchange mechanism makes the alloys ferromagnetic. Heusler structure is a combination of two B2 compounds XY and XZ. And they are classified into three; half or semi heusler alloys, full heusler alloys, and inverse heusler alloys. Some of the combinations of Heusler alloys show half metallic properties, which is the property of a material to behave as a conductor for one spin(majority spin) and to behave as a semiconductor for the other spin(minority spin). This property of half metallicity can be exploited for many nanoelectronic and spintronic devices like GMR, TMR, spin injectors, spin filters etc. In addition to this some of the combination for the alloy has good thermoelectric properties and exhibits shape memory effects…show more content…
Initially the concentration of the polymer was set at 15wt%, but the viscosity was very high which made the electrospinning voltage to be very high at 25KV. Then the concentration of the polymer solution was reduced to 9wt% then to 7.4wt%, the viscosity of the polymer solution was made optimum and approximately 0.25 gm of chlorides of iron, manganese and tin were then added to the polymer solution. The electrospinning voltage reduced accordingly with respect to the concentration of the solution. Fig. 1: Graph depicting polymer solution wt% vs electrospinning

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