ACTA

Magnetic Exchange Constant and Ferroelectric Anomaly in Magnetic Susceptibility in Sn_1-x-ySi_xMn_yTe Diluted Magnetic Semiconductors

L. Kilanski^a, M. Arciszewska^a, A. Khaliq^a, B. Brodowska^a, R. Minikayev^a, V.E. Slynko^b
^aInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
^bInstitute of Materials Science Problems, Ukrainian Academy of Sciences, 5 Wilde Str., 58001 Chernivtsi, Ukraine

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We present the studies of magnetic and electrical properties of Sn_1-x-ySi_xMn_yTe mixed crystals. The magnetic susceptibility measurements revealed the presence of two types of transitions interpreted as a paramagnet-ferromagnet transition at T<10 K due to carrier mediated Ruderman-Kittel-Kasuya-Yosida magnetic interactions and the anomaly related to the structural transition to the rhombohedral phase at T~75 K. The presence of a well-defined magnetic hysteresis with a square shape confirms that the ferromagnetic state present in our samples is related to the homogeneous magnetic domain structure with narrow domain energy distribution. The contents of the magnetic ions determined via magnetometric methods is lower than the Mn contents determined via the energy dispersive X-ray fluorescence spectroscopy method indicating the presence of a large fraction of Mn ions being either short range coupled into small clusters like pairs, triples, or other entities or having lower total magnetic momentum than Mn in high-spin state. The magnetic exchange constant of our samples is equal to 0.25-0.3 eV indicating an increase with respect to ternary Sn_1-xMn_xTe.

DOI:10.12693/APhysPolA.141.161
topics: transition-metal compounds, magnetic semiconductors