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Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis

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dc.contributor.author Nkosi, SS
dc.contributor.author Kortidis, I
dc.contributor.author Motaung, DE
dc.contributor.author Malgas, GF
dc.contributor.author Keartland, J
dc.contributor.author Sideras-Haddad, E
dc.contributor.author Forbes, A
dc.contributor.author Mwakikunga, Bonex W
dc.contributor.author Ray, Suprakas S
dc.contributor.author Kiriakidis, G
dc.date.accessioned 2013-08-05T07:52:51Z
dc.date.available 2013-08-05T07:52:51Z
dc.date.issued 2013-12
dc.identifier.citation Nkosi, S.S. et al. 2013. Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis. Journal of Alloys and Compounds, vol. 579, pp 485-494 en_US
dc.identifier.issn 0925-8388
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0925838813014886
dc.identifier.uri http://hdl.handle.net/10204/6922
dc.description Copyright: 2013 Elsevier. This is an ABSTRACT ONLY. The definitive version is published in Journal of Alloys and Compounds, vol. 579, pp 485-494 en_US
dc.description.abstract High quality un-doped and Mn-doped ZnO films deposited by a simple aerosol spray pyrolysis technique for 20 and 30 min were studied using electron paramagnetic resonance (EPR), X-ray diffraction (XRD) and atomic force microscopy (AFM) techniques. EPR analysis showed novel observation of low field microwave absorption (LFMA) on the manganese (Mn) doped zinc oxide (ZnO) films at various Mn concentrations. The results showed a peculiar behavior, reversal signal to that of LFMA. These findings also demonstrated that these films contain ferromagnetism at room temperature with possible applications in spintronics. Angular dependence measurements were found to induce magnetic transition from ferromagnetism to paramagnetism. Structural analysis showed that the undertaken materials are in wurtzite structures. The light absorption edge of Mn–ZnO films red shifted which enhanced the observed ferromagnetism. The direct modulation of the band gap caused by Mn–ZnO substitution is responsible for the red shift effect in absorption edge of ZnO. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;11313
dc.subject Spray pyrolysis en_US
dc.subject Zinc oxide en_US
dc.subject Spintronics en_US
dc.subject Low-field microwave absorption en_US
dc.subject Magnetic transition en_US
dc.title Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis en_US
dc.type Article en_US
dc.identifier.apacitation Nkosi, S., Kortidis, I., Motaung, D., Malgas, G., Keartland, J., Sideras-Haddad, E., ... Kiriakidis, G. (2013). Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis. http://hdl.handle.net/10204/6922 en_ZA
dc.identifier.chicagocitation Nkosi, SS, I Kortidis, DE Motaung, GF Malgas, J Keartland, E Sideras-Haddad, A Forbes, Bonex W Mwakikunga, Suprakas S Ray, and G Kiriakidis "Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis." (2013) http://hdl.handle.net/10204/6922 en_ZA
dc.identifier.vancouvercitation Nkosi S, Kortidis I, Motaung D, Malgas G, Keartland J, Sideras-Haddad E, et al. Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis. 2013; http://hdl.handle.net/10204/6922. en_ZA
dc.identifier.ris TY - Article AU - Nkosi, SS AU - Kortidis, I AU - Motaung, DE AU - Malgas, GF AU - Keartland, J AU - Sideras-Haddad, E AU - Forbes, A AU - Mwakikunga, Bonex W AU - Ray, Suprakas S AU - Kiriakidis, G AB - High quality un-doped and Mn-doped ZnO films deposited by a simple aerosol spray pyrolysis technique for 20 and 30 min were studied using electron paramagnetic resonance (EPR), X-ray diffraction (XRD) and atomic force microscopy (AFM) techniques. EPR analysis showed novel observation of low field microwave absorption (LFMA) on the manganese (Mn) doped zinc oxide (ZnO) films at various Mn concentrations. The results showed a peculiar behavior, reversal signal to that of LFMA. These findings also demonstrated that these films contain ferromagnetism at room temperature with possible applications in spintronics. Angular dependence measurements were found to induce magnetic transition from ferromagnetism to paramagnetism. Structural analysis showed that the undertaken materials are in wurtzite structures. The light absorption edge of Mn–ZnO films red shifted which enhanced the observed ferromagnetism. The direct modulation of the band gap caused by Mn–ZnO substitution is responsible for the red shift effect in absorption edge of ZnO. DA - 2013-12 DB - ResearchSpace DP - CSIR KW - Spray pyrolysis KW - Zinc oxide KW - Spintronics KW - Low-field microwave absorption KW - Magnetic transition LK - https://researchspace.csir.co.za PY - 2013 SM - 0925-8388 T1 - Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis TI - Orientation-dependent low field magnetic anomalies and room-temperature spintronic material – Mn doped ZnO films by aerosol spray pyrolysis UR - http://hdl.handle.net/10204/6922 ER - en_ZA


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