Highly ordered, half-metallic Co2FeSi single crystals

Abstract

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Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe

“…The temperature-independent part at low temperatures was suggested to be typical for half-metallic ferromagnets. 51,52 The residual resistivity ratio is R RR = ρ(300 K)/ρ(2 K) = 1.8. This value is small compared to other polycrystalline Heusler compounds.…”

Basics and prospective of magnetic Heusler compounds

“…14 Co 2 YZ Heusler compounds have more than 24 VEC and follow the so called Slater-Pauling rule. [17][18][19] If the number of valence electrons differs from 24, then these materials are magnetic, where the magnetic moment per formula unit is directly related to the number of valence electrons minus 24. An important distinction from the half Heusler compounds is that the full Heusler compounds have two distinct magnetic sub-lattices.…”

“…As an example, the magnetic structure and the density of states of Co 2 FeSi are illustrated in Figure 3(b): the exchange interaction between the cobalt and iron atoms is ferromagnetic. [17][18][19] For the ferromagnetic halfmetallic Heusler compounds, the Curie temperature is proportional to the number of valence electrons per formula unit above 24 and the Curie temperature increases by ∼175 K per added electron. 20,21 For example, Co 2 TiSn (26 valence electrons with a saturation magnetization of 2 µ B /formula unit) is ferromagnetic with a magnetic moment that mainly resides on the Co sites with a Curie temperature of ∼350 K. 22 All Co sites are identical in this compound.…”

“…This compound is also ferromagnetic but with magnetic moments on both the Co and Fe atoms. This compound has the highest Curie temperature of any known Heusler compound, ∼1120 K. 19 Slater-Pauling behavior is a sign of bulk halfmetallicity (100% spin polarization) in that varying the number of valence electrons varies the filling of the metallic spin polarized band so that the moment is increased or decreased in direct proportional to the number of valence electrons. [15][16][17]23 This is true as long as the Fermi energy remains within the energy gap of the semiconducting spin-polarized band.…”

First-principles study for electronic structure and physical property of Co-based Heusler alloys

“…4. Some of the experimental measurements of the electrical resistivity of Co-based Heusler alloys are reported by several workers, 7 µΩcm [15] for the single crystal, 106 µΩcm [16] for the thin film of Co 2 MnSi, and 0.2 µΩcm [17] for the single crystal, 41 µΩcm [18] for the thin film of Co 2 FeSi, respectively. These data seem to be good agreement with the calculated results, although there is no guarantee that the degree of the order, i.e.…”