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Magnetic properties of ZnO:Co layers obtained by pulsed laser deposition method

Stefaniuk I., Cieniek B., Rogalska I., Virt I. S., Kościak A.

Materials Science Poland

2018

Vol. 36, No. 3

439--444

We have studied magnetic properties of zinc oxide (ZnO) composite doped with Co ions. The samples were obtained by pulsed laser deposition (PLD) method. Electron magnetic resonance (EMR) measurements were carried out and temperature dependence of EMR spectra was obtained. Analysis of temperature dependence of the integral intensity of EMR spectra was carried out using Curie-Weiss law. Reciprocal of susceptibility of an antiferromagnetic (AFM) material shows a discontinuity at the Néel temperature and extrapolation of the linear portion to negative Curie temperature. The results of temperature dependence of EMR spectra for the ZnO:Co sample and linear extrapolation to the Curie-Weiss law indicated the AFM interaction between Co ions characterized by the Néel temperatures TN = 50 K and TN = 160 K for various samples. The obtained g-factor is similar to g-factors of nanocrystals presented in literature, and the results confirm that in the core of these nanocrystals Co was incorporated as Co2+, occupying Zn2+ sites in wurtzite structure of ZnO.

Ground-state phase diagram of a diluted FCC magnet with modified RKKY interaction in an external magnetic field

Szałowski K, Balcerzak T

Materials Science Poland

2008

Vol. 26, No. 4

1027--1032

A model of a diluted fcc magnet with modified RKKY interaction in an external magnetic field has been considered. The stability regions of paramagnetic, ferromagnetic and some typical antiferromagnetic phases in the ground state have been studied. In particular, the influence of the dilution and the external field on the phase diagrams has been discussed.