Superparamagnetic behavior of MOCVD grown ZnO:Co films

Vladimir G. Kytin; Olga V. Maximova; Vladimir A. Kulbachinskii; Lidia I. Burova; Andrey R. Kaul; Sudipta Bandyopadhya; Azaharuddin Ahmed; Aritra Banerjee

doi:10.1051/epjconf/201818506009

Proceedings

Open Access

EPJ Web of Conferences 185, 06009 (2018)
https://doi.org/10.1051/epjconf/201818506009

Superparamagnetic behavior of MOCVD grown ZnO:Co films

Vladimir G. Kytin¹^*, Olga V. Maximova¹, Vladimir A. Kulbachinskii¹^,2, Lidia I. Burova¹, Andrey R. Kaul¹, Sudipta Bandyopadhya³, Azaharuddin Ahmed³ and Aritra Banerjee³

¹ MV Lomonosov MSU, Moscow, GSP-1, 119991, Moscow, Russia
² National Research Nuclear University MEPhI, Moscow 115409, Russia
³ University of Calcutta, Calcutta, India, 92, Acharya Prafulla Chandra Road, Kolkata -700 009, India

^* Corresponding author : kytin@mig.phys.msu.ru

Published online: 4 July 2018

Abstract

Temperature and field dependences of magnetization have been measured for Co-doped ZnO films with different Co content grown by MOCVD on sapphire substrates. Measured field dependences of magnetization show ferromagnetic-like hysteresis loops and paramagnetic contribution. Coercive field decreases with an increase of Co content and temperature. The difference between temperature dependences of magnetization measured in zero field cooling and field cooling conditions was observed in the temperature range from 2 K to 300 K indicating superparamagnetic behaviour of the films. The distribution of blocking temperatures extracted from the temperature dependences of magnetization is broad and shifts to the low blocking temperatures with an increase of Co content

© The Authors, published by EDP Sciences, 2018

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