Room temperature ferromagnetism in Zn1−Co S thin films with wurtzite structure

Authors :: Ramesh Chandra
Lokendra Kumar
Shiv P. Patel
J.C. Pivin
Amit Kumar Chawla
Dinakar Kanjilal
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)
Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Inter University Accelerator Centre
Source :: Journal of Magnetism and Magnetic Materials, Journal of Magnetism and Magnetic Materials, Elsevier, 2011, 323, pp.2734-2740. ⟨10.1016/j.jmmm.2011.05.057⟩
Publication Year :: 2011
Publisher :: Elsevier BV, 2011.
Abstract: The magnetic properties of Zn 1− x Co x S ( x =0.025 and 0.05) thin films grown on α-quartz substrates at different temperatures ( T S ) of 200, 400 and 600 °C by means of pulsed laser deposition are presented. The films are crystallized with wurtzite structure. Optical absorption and transmission electron microscopy measurements indicate that Co ions are substituted to Zn on tetrahedral sites. Their magnetic response is composed of ferromagnetic and paramagnetic components of which respective strengths depend on T S and Co concentration. This behavior is interpreted as due to fluctuations in the magnetic ordering, depending on grain size and site location in grain boundaries or in crystal cores.