Effect of partial substitution of silicon by other sp-valent elements on structure, magnetic properties and electrical resistivity of Co2FeSi Heusler alloys

Monocrystalline Heusler Co2FeSi alloy glass-coated microwires: Fabrication and magneto-structural characterization

“…Cross-section SEM image of glass-coated microwire shown in Figure 1 wide plateau that corresponds to the glass-coating together with the crystalline patterns of the metallic nucleus corresponding to the B2 phase with a lattice parameter a = 5.615 Å, which is similar to the values presented in other works (5.66 Å) [13].…”

“…However, recent theoretical investigation on the spin polarization of fully ordered L2 1 and fully disordered B2 structure of Co 2 FeSi Heusler alloy reveals that both systems are half metallic. [2] Lately studies [13,[23][24][25][26] have shown that the half-metallic character and structural disorder of Heusler alloys can be predicted by simple electrical resistivity variation with temperature. In our case, the resistivity data was found to fit well with the relations presented in the published work by Bombor et al, [26].…”

“…Due to the above mentioned disorder, the production of Heusler alloys brings some disadvantages [13]. Heusler alloys are usually prepared by arc-melting method.…”

Influence of Mn Doping on Magnetic and Structural Properties of Co_2FeSi Heusler Alloy

“…4) shows the ordinary ferromagnetic behavior -magnetization decreases with increase of temperature. The Curie temperature (T c ) of Co 2 FeSi Heusler ribbon was found to be about 1070 K and it corresponds well with the value from the literature [10]. [11].…”

Ni_2FeSi Heusler Glass Coated Microwires

“…The mutual exchange between X and Y atoms positions of elements for the X 2 YZ Heusler alloy in L2 1 lattice can result in the DO3 disorder, which is difficult to detect by X-ray diffraction analysis with an ordinary Cu K α source alone. The lattice parameter of crystalline structure was estimated from the angle position of the Bragg peaks and their Miller index giving a value of a = 5.563 Å, which is similar to the lattice parameter for Co 2 FeSi alloy [11]. Figure 2 displays the thermomagnetic evolution of the Ni 2 FeSi alloy microwire from RT up to 1000 K (black curve) and cooling down (red curve), for the static magnetic field value of 100 Oe applied in the parallel direction with respect to the wire axis.…”