The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

S. Venkatesh; Abdulaziz Mohammed Salem Ba Ras; J.-S. Lee; Iman S. Roqan

doi:10.1063/1.4944954

The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

S. Venkatesh, Abdulaziz Mohammed Salem Ba Ras, J.-S. Lee, Iman S. Roqan

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11 Scopus citations

Abstract

We studied the nature of magnetic ordering in Mn-doped ZnO thin films that exhibited ferromagnetism at 300 K and superparamagnetism at 5 K. We directly inter-related the magnetisation and magnetoresistance by invoking the polaronpercolation theory and variable range of hopping conduction below the metal-to-insulator transition. By obtaining a qualitative agreement between these two models, we attribute the ferromagnetism to the s-d exchange-induced spin splitting that was indicated by large positive magnetoresistance (∼40 %). Low temperature superparamagnetism was attributed to the localization of carriers and non-interacting polaron clusters. This analysis can assist in understanding the presence or absence of ferromagnetism in doped/un-doped ZnO.

Original language	English (US)
Pages (from-to)	035019
Journal	AIP Advances
Volume	6
Issue number	3
DOIs	https://doi.org/10.1063/1.4944954
State	Published - Mar 24 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors wish to thank KAUST for the financial support. Synchrotron studies were carried
out at the SSRL, a Directorate of SLAC and an Office of Science User Facility operated for the US DOE Office of Science by Stanford University. J.S.L. acknowledges partial funding from the
Global Research Laboratory program of the Korean Ministry of Education, Science, and Technology
(MEST). The authors also thank Dr. Paul R Edwards and Prof. Robert W Martin for using
EPMA facilities at University of Strathclyde.

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title = "The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films",

abstract = "We studied the nature of magnetic ordering in Mn-doped ZnO thin films that exhibited ferromagnetism at 300 K and superparamagnetism at 5 K. We directly inter-related the magnetisation and magnetoresistance by invoking the polaronpercolation theory and variable range of hopping conduction below the metal-to-insulator transition. By obtaining a qualitative agreement between these two models, we attribute the ferromagnetism to the s-d exchange-induced spin splitting that was indicated by large positive magnetoresistance (∼40 %). Low temperature superparamagnetism was attributed to the localization of carriers and non-interacting polaron clusters. This analysis can assist in understanding the presence or absence of ferromagnetism in doped/un-doped ZnO.",

author = "S. Venkatesh and {Ba Ras}, {Abdulaziz Mohammed Salem} and J.-S. Lee and Roqan, {Iman S.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors wish to thank KAUST for the financial support. Synchrotron studies were carried out at the SSRL, a Directorate of SLAC and an Office of Science User Facility operated for the US DOE Office of Science by Stanford University. J.S.L. acknowledges partial funding from the Global Research Laboratory program of the Korean Ministry of Education, Science, and Technology (MEST). The authors also thank Dr. Paul R Edwards and Prof. Robert W Martin for using EPMA facilities at University of Strathclyde.",

year = "2016",

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doi = "10.1063/1.4944954",

language = "English (US)",

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T1 - The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

AU - Venkatesh, S.

AU - Ba Ras, Abdulaziz Mohammed Salem

AU - Lee, J.-S.

AU - Roqan, Iman S.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors wish to thank KAUST for the financial support. Synchrotron studies were carried out at the SSRL, a Directorate of SLAC and an Office of Science User Facility operated for the US DOE Office of Science by Stanford University. J.S.L. acknowledges partial funding from the Global Research Laboratory program of the Korean Ministry of Education, Science, and Technology (MEST). The authors also thank Dr. Paul R Edwards and Prof. Robert W Martin for using EPMA facilities at University of Strathclyde.

PY - 2016/3/24

Y1 - 2016/3/24

N2 - We studied the nature of magnetic ordering in Mn-doped ZnO thin films that exhibited ferromagnetism at 300 K and superparamagnetism at 5 K. We directly inter-related the magnetisation and magnetoresistance by invoking the polaronpercolation theory and variable range of hopping conduction below the metal-to-insulator transition. By obtaining a qualitative agreement between these two models, we attribute the ferromagnetism to the s-d exchange-induced spin splitting that was indicated by large positive magnetoresistance (∼40 %). Low temperature superparamagnetism was attributed to the localization of carriers and non-interacting polaron clusters. This analysis can assist in understanding the presence or absence of ferromagnetism in doped/un-doped ZnO.

AB - We studied the nature of magnetic ordering in Mn-doped ZnO thin films that exhibited ferromagnetism at 300 K and superparamagnetism at 5 K. We directly inter-related the magnetisation and magnetoresistance by invoking the polaronpercolation theory and variable range of hopping conduction below the metal-to-insulator transition. By obtaining a qualitative agreement between these two models, we attribute the ferromagnetism to the s-d exchange-induced spin splitting that was indicated by large positive magnetoresistance (∼40 %). Low temperature superparamagnetism was attributed to the localization of carriers and non-interacting polaron clusters. This analysis can assist in understanding the presence or absence of ferromagnetism in doped/un-doped ZnO.

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DO - 10.1063/1.4944954

M3 - Article

SN - 2158-3226

VL - 6

SP - 035019

JO - AIP Advances

JF - AIP Advances

IS - 3

ER -

The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

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