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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Magnetic and anomalous electronic transport properties of the quaternary Heusler alloys Co2Ti1−xFexGe
TL;DR: In this article, the structural, magnetic and electronic transport properties of quaternary Co 2 Ti 1− x Fe x Ge (x = 0.2, 0.4,0.6, 08) Heusler alloys were investigated.
Journal ArticleDOI
Possible half-metallic behavior of Co 2 − x Cr x FeGe Heusler alloys: Theory and experiment
Rabin Mahat,S. Kc,Upama Karki,Jia Yan Law,Victorino Franco,Iosif Galanakis,Arunava Gupta,Patrick LeClair +7 more
TL;DR: In this article, a combined experimental and theoretical study of structural, electronic, magnetic, and mechanical properties of quaternary Heusler alloys was performed and the results showed that all the alloys have high Curie temperatures that scale linearly with the saturation magnetic moments.
Journal ArticleDOI
Curie temperature determination via thermogravimetric and continuous wavelet transformation analysis
TL;DR: A cost effective method for conversion of a vertical tube thermogravimetric analysis system into a magnetic balance capable of measuring Curie temperatures is presented in this article, where reference and preliminary experimental data generated using this system is analyzed via a general-purpose wavelet based Curie point edge detection technique.
Journal ArticleDOI
Tunable properties and potential half-metallicity in (Co 2 -x Ti x )FeGe Heusler alloys: An experimental and theoretical investigation
Shambhu Kc,Rabin Mahat,Sudhir Regmi,A. Mukherjee,Prahallad Padhan,Ranjan Datta,W. H. Butler,Arunava Gupta,Patrick LeClair +8 more
TL;DR: In this article, the substitution of Ti atoms for Co atoms has been shown to stabilize single-phase microstructures for compositions from 0.125$ to 0.625$ in the Heusler alloy series.
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First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications
TL;DR: In this article, the authors reported the synthesis and physical properties of Co2FeGe (CFG) Heusler alloy (HA) nanoparticles (NPs) using the co-precipitation method.
References
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Journal ArticleDOI
Accurate and simple analytic representation of the electron-gas correlation energy
John P. Perdew,Yue Wang +1 more
TL;DR: A simple analytic representation of the correlation energy for a uniform electron gas, as a function of density parameter and relative spin polarization \ensuremath{\zeta}, which confirms the practical accuracy of the VWN and PZ representations and eliminates some minor problems.
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Spintronics: Fundamentals and applications
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Journal ArticleDOI
New Class of Materials: Half-Metallic Ferromagnets
TL;DR: The band structure of Mn-based Heusler alloys of the crystal structure (MgAgAs type) has been calculated with the augmented-spherical-wave method.
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Slater-Pauling behavior and origin of the half-metallicity of the full-Heusler alloys
TL;DR: In this article, the full-potential screened Korringa-Kohn-Rostoker method was used to study the half-metallic properties of Co, Fe, Rh, and Ru.
Journal ArticleDOI
Half-metallic ferromagnets: From band structure to many-body effects
TL;DR: A review of new developments in theoretical and experimental electronic-structure investigations of half-metallic ferromagnets (HMFs) is presented in this article, where the effects of electron-magnon interaction in HMFs and their manifestations in magnetic, spectral, thermodynamic, and transport properties are considered.