Optical and magneto-optical properties of ZnMnO and ZnMnFeO single crystals and thin films

Andriy I. Savchuk ,  Volodymyr I. Fediv ,  Gennadiy I. Kleto ,  Serhiy V. Krychun ,  Serhiy A. Savchuk 

Chernivtsi National University (ChNU), 2 Kotsubinsky Str., Chernivtsi 58012, Ukraine

Abstract

At present the existing or absence of room temperature ferromagnetism in zinc oxide-based diluted magnetic semiconductors is main point for discussion and an increased interest to these materials. It was found that their magnetic properties depend on content of magnetic ions and the growth parameters. In this work single crystals of Zn1-xMnxO with 0<x<0.1 were grown by chemical vapour transport technique. Thin films of Zn1-xMnxO (x=0; 0.06; 0.1) and Zn1-x-yMnxFeyO (x=0.05; y=0.07) were deposited by pulsed laser ablation and rf magnetron sputtering methods on quartz and sapphire substrates. Optical absorption, magnetoabsorption and Faraday rotation spectra were measured at temperature range of (5-400) K in magnetic field up to 25 T. In the absorption spectra new structure has been found which can be attributed to the charge-transfer transitions. The observed peculiarities in magneto-optical spectra in Zn1-xMnxO single crystals and thin films are explained in framework of strong spin exchange interaction between d-electrons of Mn2+ and s,p - band carriers. The revealed negative sign of the Faraday rotation angle, typical temperature and magnetic field dependences suggest of paramagnetic state of Zn1-xMnxO single crystals and thin films. On the other hand, Zn1-x-yMnxFeyO film samples exhibit ferromagnetic-like behavior at room temperature. Origin of this ferromagnetic ordering is discussed. Application of the studied materials for spintronic purposes is considered. The work was supported partially by grants No. M/128-2004 and No.D3/152-2005 from Ministry of Education and Science of Ukraine.

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium E, by Serhiy A. Savchuk
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-14 08:56
Revised:   2009-06-07 00:44
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