Paramagnetism and antiferromagnetic interactions in Cr-doped GaN
نویسندگان
چکیده
منابع مشابه
Paramagnetism and antiferromagnetic interactions in Cr-doped GaN.
We report on the magnetic and structural properties of Cr-doped GaN prepared by ion implantation of epitaxial thin films. Based on a detailed analysis of the magnetometry data, we demonstrate that the magnetic interactions between Cr moments in GaN are antiferromagnetic (AFM). Increasing the Cr fractional concentration up to 0.35, we observe that strong nearest cation neighbor AFM coupling resu...
متن کاملParamagnetism and antiferromagnetic interactions in single-phase Fe-implanted ZnO.
As the intrinsic origin of the high-temperature ferromagnetism often observed in wide-gap dilute magnetic semiconductors becomes increasingly debated, there is a growing need for comprehensive studies on the single-phase region of the phase diagram of these materials. Here we report on the magnetic and structural properties of Fe-doped ZnO prepared by ion implantation of ZnO single crystals. A ...
متن کاملFerromagnetic GaN--Cr Nanowires.
Using first-principles theory, we predict ferromagnetism in Cr-doped GaN nanowires irrespective of the sites that the Cr atoms occupy. This is in contrast to Mn-doped GaN nanowires in which the magnetic coupling between the Mn atoms is sensitive to the Mn--Mn and Mn--N distances, although the ground state of Mn-doped GaN nanowires is ferromagnetic. Each Cr atom carries a magnetic moment of abou...
متن کاملRole of embedded clustering in dilute magnetic semiconductors: Cr doped GaN.
Results of extensive density-functional studies provide direct evidence that Cr atoms in Cr:GaN have a strong tendency to form embedded clusters, occupying Ga sites. Significantly, for larger than 2-Cr-atom clusters, states containing antiferromagnetic coupling with net spin in the range 0.06-1.47 muB/Cr are favored. We propose a picture where various configurations coexist and the statistical ...
متن کاملELASTICITY OF ANTIFERROMAGNETIC Cr-Ru ALLOYS
Bulk and shear moduli of Cr-Ru alloys in the concentration range 11 < c 5 20 at.% Ru are reported. Phase changes previously observed at 170 K in the magnetic susceptibility of these alloys were not observed in the temperature behaviour of the elastic moduli. Cr can dissolve up to 25 at.% Ru and still retain its bcc structure [I]. The addition of Ru has interesting effects on the magnetic and el...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2011
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/23/34/346004