Magnetic, electric and crystallographic properties of diluted magnetic InSe <inf>(1-x)</inf>Fe(Co) <inf>x</inf> semiconductor

Abstract

The structural, magnetic and electric properties of Fe or Co doped InSe system has been studied. The X-ray diffraction patterns of the doped samples indicate the presence of InSe 0.9Fe 0.1 or InSe 0.9Co 0.1, together with a non-magnetic minor phase of In 4Se 3. The InSe 0.9Fe 0.1 system is ferromagnetic with high Curie temperature of 870 K. In contrast, the InSe 0.9Co 0.1 system is antiferromagnetic with different Neel temperatures. Crystallite sizes of the different phases show anisotropy along different crystallographic directions, they vary from 9 to 40 nm. The largest size is along the [0 0 l] direction normal to the staking layers planes. The random model was applied to explain the origin of ferromagnetic properties of Fe doped sample. The non-magnetic phase In 4Se 3 played a major role in the high temperature ferromagnetic properties of InSe 0.9Fe 0.1 and the polarization of magnetic spins . The electrical conductivity increased by an order of magnitude of 2 and 1.5 in the case of Fe and Co doped samples, respectively, suggesting that the incorporation of Fe or Co creates new band configuration and hence a modification of electronic density of states of the samples studied. The anomaly in the electrical properties after doping with Fe or Co may suggest that these doped samples may be used as spintronics materials. © 2012 Elsevier B.V. All rights reserved.