Low Temperature Physics: 35, 62 (2009); https://doi.org/10.1063/1.3064911 (9 pages)
Fizika Nizkikh Temperatur: Volume 35, Number 1 (January 2009), p. 81-91    ( to contents , go back )

Diluted magnetic semiconductors based on II-VI, III-VI and IV-VI compounds

G.V. Lashkarev, V.I. Sichkovskyi, M.V. Radchenko, V.A. Karpina, P.E. Butorin, O.I. Dmitriev, V.I. Lazorenko, E.I. Slyn'ko

Institute for Problems of Materials Science of the National Academy of Sciences of Ukraine 3 Krzhyzhanovsky Str., Kiev 03680, Ukraine
E-mail: georgl@isp.kiev.ua

P.M. Lytvyn

Институт физики полупроводников им. В.Е. Лашкарева НАН Украины, пр. Науки, 45, г. Киев, 03028, Украина

R. Jakiela, W. Knoff, T. Story, and P. Aleshkevych

Институт физики Польской академии наук, Aл. Лотников, 32/46, г. Варшава, Польша
pos Анотація:

Received Jule 21, 2008

Abstract

Phase and chemical compositions, magnetic susceptibility, SIMS, magnetic force microscopy and neutron diffractometry of Ge1–xySnxMnyTe, InSe and ZnO single crystals were investigated in a wide range of temperatures and magnetic fields. It is found that in Ge1–xySnxMnyTe there exists a ferromagnetic ordering with Curie temperature TC ~ 50 K, caused by indirect exchange interaction between the Mn ions via degenerate hole gas. The FM regions of the crystal at T < 50 K are shown to be in a spin glass state. In InSe hysteresis loops of magnetic moment M(H) are observed up to 350 K, testifying that the FM ordering connected with FM clusters does exist in which a superexchange between Mn ions via anions (Se) and with indirect interaction via 2D electron gas is supposed to occur. The magnetic sublattice period for the α-MnSe (antiferromagnetic) second phase inclusions is found to be doubled at T < 70 K. Its disposition in the layered structure of the InSe matrix is of regular character, resulting in a self-assembled superlattice FM/AFM. The temperature dependence of magnetic moment in ZnO follows the Curie law. With increasing the Co concentration in ZnO higher than the solubility limit, hysteresis loops are observed as a result of the second FM phase occurence. In the case of the doping element within the solubility limits, ZnO and some ZnO samples display antiferromagnetic behavior.

PACS: 72.20.My Galvanomagnetic and other magnetotransport effects;
PACS: 75.50.Pp Magnetic semiconductors;
PACS: 68.37.Rt Magnetic force microscopy(MFM).

Key words: diluted magnetic semiconductors, spin electronic, magnetic susceptibility, resistivity, anomalous Hall effect.

Download 1790411 byte View Contents