Journal ArticleDOI
First-Principles Calculation and Experimental Investigations on Full-Heusler Alloy Co $_{2}$ FeGe
K. Ramesh Kumar,K. Kamala Bharathi,J. Arout Chelvane,S. Venkatesh,G. Markandeyulu,N. Harishkumar +5 more
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In this paper, first principles for the full Heusler alloy Co2FeGe within the scheme of density functional theory using plane-wave self-consistent field method were carried out.Abstract:
First-principles calculation has been carried out for the full Heusler alloy Co2FeGe within the scheme of density functional theory using plane-wave self-consistent field method. The spin polarized band structure does not show any energy gap at the Fermi level for both up and down spin electrons. Atom resolved magnetic moment on each site was observed to be 1.3 muB (Co), 2.9 muB (Fe), and 0.0 muB (Ge). X-ray diffraction studies reveal a B2-type structure for the bulk sample and cubic L21 structure for the melt-spun ribbons. The lattice parameter value for the ribbon is 5.736 Aring, and its Curie temperature is around 981 K. The magnetic moment per formula unit at 5 K was observed to be 5.74 muB. The low temperature data ( < 100 K) follows the relationrho = rho0 + AT2 + BT4.5 , indicating the presence of one magnon spin-flip scattering.read more
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Spin polarization and Gilbert damping of Co2Fe(GaxGe1−x) Heusler alloys
B. S. D. Ch. S. Varaprasad,Ashok Srinivasan,Ashok Srinivasan,Yukiko Takahashi,Masamitsu Hayashi,A. Rajanikanth,Kazuhiro Hono +6 more
TL;DR: The spin polarization of ferromagnetic Heusler alloys, Co 2 Fe(Ga x Ge 1−x ) ( x ǫ = 0, 0.75, and 1), is investigated by point contact Andreev reflection (PCAR) measurements as discussed by the authors.
Journal ArticleDOI
Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co2Fe(Ge0.5Ga0.5) Heusler alloy
Yukiko Takahashi,A. Srinivasan,B. Varaprasad,A. Rajanikanth,N. Hase,Tomoya Nakatani,Shinya Kasai,Takao Furubayashi,Kazuhiro Hono,Kazuhiro Hono +9 more
TL;DR: Using a newly developed highly spin-polarized Heusler alloy, Co2Fe(Ga05Ge05) (CFGG), as ferromagnetic layers, a current-perpendicular-to-plane pseudospin valve with large resistance change-area product (ΔRA) of 95mΩμm2 and magnetoresistance (MR) ratio (100×ΔR/R) of 417% at 300 K were fabricated in this paper.
Journal ArticleDOI
Electronic and magnetic properties of the Co2-based Heusler compounds under pressure: first-principles and Monte Carlo studies
Mikhail A. Zagrebin,Mikhail A. Zagrebin,Vladimir V. Sokolovskiy,Vladimir V. Sokolovskiy,Vasiliy D. Buchelnikov +4 more
TL;DR: In this article, structural, magnetic and electronic properties of stoichiometric Co2 YZ Heusler alloys have been studied by means of ab initio calculations and Monte Carlo simulations.
Journal ArticleDOI
Electronic structure, optical and magnetic properties of Co2FeGe Heusler alloy films
N. V. Uvarov,Yu. V. Kudryavtsev,A. F. Kravets,A.Ya. Vovk,R. P. Borges,Maria Helena Godinho,Vladislav Korenivski +6 more
TL;DR: In this paper, the optical properties of a half-metallic full-Heusler Co2FeGe alloy were investigated experimentally and theoretically, and first principles calculations of the electronic structure and the dielectric tensor were performed using the fullpotential linearized-augmented-plane-wave method.
Journal ArticleDOI
Electronic structure, optical and magnetic properties of Co$_{2}$FeGe Heusler alloy films
N. V. Uvarov,Yu. V. Kudryavtsev,A. F. Kravets,A.Ya. Vovk,R. P. Borges,Maria Helena Godinho,Vladislav Korenivski +6 more
TL;DR: In this paper, the optical properties of a half-metallic full-Heusler Co$2}$FeGe alloy were investigated experimentally and theoretically, and first-principles calculations of the electronic structure and the dielectric tensor were performed using the full-potential linearized-augmented-plane-wave method in the generalized gradient (GGA) and GGA+U approximations.
References
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New Class of Materials: Half-Metallic Ferromagnets
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Slater-Pauling behavior and origin of the half-metallicity of the full-Heusler alloys
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Half-metallic ferromagnets: From band structure to many-body effects
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