Synthesis of Co 2 FeSn Heusler alloy using a simple and low-cost electrodeposition method is reported for the first time. The effect of deposition current density on crystal structure, chemical composition, morphology and magnetic properties of the samples was studied. The electrodeposited Co 2 FeSn alloy showed a nanocrystalline structure. Magnetic measurement reveals that the obtained Co 2 FeSn are soft magnetic at room temperature with the coercivity of 32 Oe. The saturation magnetic moment of the electrodeposited Co 2 FeSn alloy at 5 K is estimated to be 4.5 μ B /f.u. The relationship between the microstructure and magnetic properties of the samples was discussed.The Co 2 YZ (Y = transition metals, Z = main group element) Heusler compounds are of special interest for applications as they exhibit a large saturation magnetization and high value of Curie temperature. They are a remarkable class of magnetic materials that hold the greatest potential to achieve half-metallicity at room temperature and are also ideal for spintronics. 1,2 Up to now, a large number of Co 2 YZ compounds have been synthesized and their structures and physical properties have been investigated. 3 Various methods include magnetron sputtering, 4,5 molecular beam epitaxy, 6 arc melting 7 and ballmilling 8 are commonly used to prepare the Heusler alloys.Recently, there has been a renaissance of the electrochemical deposition method for the synthesis of compositionally modulated alloys, because the electrodeposition process is cheap and is possible for industrial production. 9-11 The advantages of electrodeposition over physical deposition methods are numerous: no need of vacuum equipment, easier handling, higher deposition rates. 12 Moreover, electrodeposition has the potential to yield amorphous and microcrystalline alloys which cannot be obtained from the corresponding thermally produced alloys of the same chemical composition. 13 Regretfully, up to now, there are no studies on the synthesis of Co 2 YZ Heusler alloys using the electrodeposition method.Co 2 FeSn is a cheap Heusler alloy and is predicted to have considerably large magnetic moment according to Slater-Pauling behavior. 14,15 In Co 2 YZ Heusler compounds with the cubic L2 1 ordered structure, Co atoms occupy the Wyckoff position 8c (1/4, 1/4, 1/4), Y and Z atoms are located at 4a (0, 0, 0) and 4b (1/2, 1/2, 1/2), respectively. Depending on site exchangeability, various types of site disorders have been identified: if all atomic sites are equivalent, the Co 2 YZ Heusler alloy will show an A2-type disorder [body-centered cubic (bcc) lattice]; while if only Y and Z atoms are exchangeable, the 4a and 4b positions become equivalent, the Co 2 YZ Heusler alloy will show a B2 ordered structure (simple cubic lattice). 16 In our previous work, Heusler Co 2 FeSn nanoparticles in a B2-type cubic structure have been synthesized by using a solution reduction method. 17 The obtained Heusler Co 2 FeSn nanoparticles were ferromagnetic at room temperature and showed a saturation magnetization (...
Heusler Co 2 FeSn nanoparticles in a B2-type cubic structure were synthesised for the first time using a simple solution reduction method. X-ray diffraction, a scanning electron microscope, an energy dispersive spectrometer and a vibrating sample magnetometer were used to characterise the synthesised products. The crystal structure and composition of the samples vary with the concentration of potassium hydroxide, synthesis temperature and reaction time. Magnetic measurement reveals that the obtained Co 2 FeSn nanoparticles are soft magnetic at room temperature. The Co 2 FeSn nanoparticles synthesised in this work are magnetically superior and economically feasible for spintronic applications.
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