B. Aktaş
Gebze Institute of Technology
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Featured researches published by B. Aktaş.
Physical Review B | 2007
I. Galanakis; B. Aktaş; E. Sasioglu; K. Özdoğan
Electronic structure calculations from first-principles are employed to design some new half-metallic fully-compensated ferrimagnets (or as they are widely known half-metallic antiferromagnets) susceptible of finding applications in spintronics. Cr2MnZ (Z= P, As, Sb, Bi) compounds have 24 valence electrons per unit cell and calculations show that their total spin moment is approximately zero for a wide range of lattice constants in agreement with the Slater-Pauling behavior for ideal half-metals. Simultaneously, the spin magnetic moments of Cr and Mn atoms are antiparallel and the compounds are ferrimagnets. Mean-field approximation is employed to estimate their Curie temperature, which exceeds room temperature for the alloy with Sb. Our findings suggest that Cr2MnSb is the compound of choice for further experimental investigations. Contrary to the alloys mentioned above half-metallic antiferromagnetism is unstable in the case of the Cr2FeZ (Z= Si, Ge, Sn) alloys.
Journal of Physics: Condensed Matter | 2006
Kemal Özdoğan; I. Galanakis; E. Şaşıoğlu; B. Aktaş
Using a state-of-the-art full-potential electronic structure method within the local spin density approximation, we study the electronic and magnetic structure of Mn2V-based full Heusler alloys: Mn2VZ (Z = Al, Ga, In, Si, Ge and Sn). We show that small expansion of the calculated theoretical equilibrium lattice constants restores the half-metallic ferrimagnetism in these compounds. Moreover, a small degree of disorder between the V and Z atoms, although it induces some states within the gap, preserves the Slater–Pauling behaviour of the spin magnetic moments and the alloys keep a high degree of spin polarization at the Fermi level, opening the way for a half-metallic compensated ferrimagnet.
Physical Review B | 2006
Kemal Özdoğan; E. Sasioglu; B. Aktaş; I. Galanakis
We expand our study of the full-Heusler compounds [I. Galanakis et al., Appl. Phys. Lett. 89, 042502 (2006)] to cover also the case of doping and disorder in the case of
Journal of Applied Physics | 2007
K. Özdoğan; B. Aktaş; I. Galanakis; E. Şaşıoğlu
{\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}
Physical Review B | 2006
K. Özdoğan; E. Şaşıoğlu; B. Aktaş; I. Galanakis
and
Journal of Applied Physics | 2011
Giray Kartopu; Orhan Yalçın; K.-L. Choy; R. Topkaya; S. Kazan; B. Aktaş
{\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}
Journal of Applied Physics | 2007
B. Aktaş; B. Heinrich; Georg Woltersdorf; R. Urban; L. R. Tagirov; F. Yıldız; K. Özdoğan; M. Özdemir; O. Yalçin; B. Z. Rameev
half-metallic Heusler alloys. These alloys present a region of very small minority density of states instead of a real gap. Electronic structure calculations reveal that doping with Fe and Cr in the case of
Journal of Applied Physics | 2010
R. Topkaya; Mustafa Erkovan; A. Öztürk; O. Öztürk; B. Aktaş; M. Özdemir
{\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}
Applied Physics Letters | 2010
S. Kazan; F. Mikailzade; M. Özdemir; B. Aktaş; B.Z. Rameev; A. Intepe; Arunava Gupta
retains half-metallicity contrary to the
Journal of Applied Physics | 2011
Mustafa Erkovan; S. T. Öztürk; R. Topkaya; M. Özdemir; B. Aktaş; O. Öztürk
{\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}