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

S. S. Nkosi; I. Kortidis; D. E. Motaung; G. F. Malgas; J. Keartland; E. Sideras-Haddad; A. Forbes; B. W. Mwakikunga; S. Sinha-Ray; G. Kiriakidis

doi:10.1016/j.jallcom.2013.06.090

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

S. S. Nkosi, I. Kortidis, D. E. Motaung, G. F. Malgas, J. Keartland, E. Sideras-Haddad, A. Forbes, B. W. Mwakikunga, S. Sinha-Ray, G. Kiriakidis

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

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.

Original language	English
Pages (from-to)	484-494
Number of pages	11
Journal	Journal of Alloys and Compounds
Volume	579
DOIs	https://doi.org/10.1016/j.jallcom.2013.06.090
Publication status	Published - 2013
Externally published	Yes

Keywords

Low-field microwave absorption
Magnetic transition
Spintronics
Spray pyrolysis
Zinc oxide

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2013.06.090

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Nkosi, S. S., Kortidis, I., Motaung, D. E., Malgas, G. F., Keartland, J., Sideras-Haddad, E., Forbes, A., Mwakikunga, B. W., Sinha-Ray, S., & Kiriakidis, G. (2013). Orientation-dependent low field magnetic anomalies and roomerature spintronic material - Mn doped ZnO films by aerosol spray pyrolysis. Journal of Alloys and Compounds, 579, 484-494. https://doi.org/10.1016/j.jallcom.2013.06.090

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title = "Orientation-dependent low field magnetic anomalies and roomerature spintronic material - Mn doped ZnO films by aerosol spray pyrolysis",

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.",

keywords = "Low-field microwave absorption, Magnetic transition, Spintronics, Spray pyrolysis, Zinc oxide",

author = "Nkosi, {S. S.} and I. Kortidis and Motaung, {D. E.} and Malgas, {G. F.} and J. Keartland and E. Sideras-Haddad and A. Forbes and Mwakikunga, {B. W.} and S. Sinha-Ray and G. Kiriakidis",

year = "2013",

doi = "10.1016/j.jallcom.2013.06.090",

language = "English",

volume = "579",

pages = "484--494",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

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Nkosi, SS, Kortidis, I, Motaung, DE, Malgas, GF, Keartland, J, Sideras-Haddad, E, Forbes, A, Mwakikunga, BW, Sinha-Ray, S & Kiriakidis, G 2013, 'Orientation-dependent low field magnetic anomalies and roomerature spintronic material - Mn doped ZnO films by aerosol spray pyrolysis', Journal of Alloys and Compounds, vol. 579, pp. 484-494. https://doi.org/10.1016/j.jallcom.2013.06.090

TY - JOUR

T1 - Orientation-dependent low field magnetic anomalies and roomerature spintronic material - Mn doped ZnO films by aerosol spray pyrolysis

AU - Nkosi, S. S.

AU - Kortidis, I.

AU - Motaung, D. E.

AU - Malgas, G. F.

AU - Keartland, J.

AU - Sideras-Haddad, E.

AU - Forbes, A.

AU - Mwakikunga, B. W.

AU - Sinha-Ray, S.

AU - Kiriakidis, G.

PY - 2013

Y1 - 2013

N2 - 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.

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.

KW - Low-field microwave absorption

KW - Magnetic transition

KW - Spintronics

KW - Spray pyrolysis

KW - Zinc oxide

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DO - 10.1016/j.jallcom.2013.06.090

M3 - Article

AN - SCOPUS:84884254308

SN - 0925-8388

VL - 579

SP - 484

EP - 494

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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