Title :
The effects of arsenic doping on the magnetic properties of CuCr 2Se4
Author :
Tang, Jinke ; Li, Ly ; Saxena, Siddharth S. ; Puri, Ashok ; Falster, Alexander U. ; Simmons, William B., Jr.
Author_Institution :
Dept. of Phys., New Orleans Univ., LA, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
In order to further our understanding of a new class of magneto-optical materials, the effects of arsenic doping on the magnetic properties of CuCr2Se4 have been investigated. Polycrystalline samples were prepared by solid state reaction of fine powders of the involved elements. The solubility of arsenic in CuCr2Se4-xAsx is found to be less than 5% (x=0.2). X-ray diffraction data indicates the corresponding increase in the lattice constant a as a result of arsenic doping. The Curie temperature is found to decrease from Tc=330 K to 388 K as doping level is increased from x=0 to 0.1. The saturation moment (measured at 4.5 K and up to 2 T) of the doped sample (x=0.1) is reduced to 4.25 μβ/formula unit from 4.88 μB/formula unit, which corresponds to the value for an undoped sample (x=0). A reduction in coercivity is also observed as a result of the doping. These effects are attributed to the increased number of holes in the anion valence band as a result of the arsenic doping
Keywords :
Curie temperature; arsenic; chromium compounds; coercive force; copper compounds; ferromagnetic materials; lattice constants; magnetic moments; magnetic semiconductors; solid solubility; ternary semiconductors; 388 K; 430 K; As doping; CuCr2Se4-xAsx; CuCr2Se4:As; Curie temperature; X-ray diffraction data; anion valence band; coercivity; fine powders; holes; lattice constant; magnetic properties; magneto-optical materials; polycrystalline samples; saturation moment; solid state reaction; solubility; Coercive force; Doping; Lattices; Magnetic materials; Magnetic properties; Magnetooptic effects; Powders; Solid state circuits; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
