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

Here, 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.
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; zinc oxide films; polarons; magnetoresistance; II-VI semiconductors; percolation
OSTI Identifier:
1251395

Venkatesh, S., Baras, A., Lee, J. -S., and Roqan, I. S.. The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films. United States: N. p., Web. doi:10.1063/1.4944954.
Venkatesh, S., Baras, A., Lee, J. -S., & Roqan, I. S.. The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films. United States. doi:10.1063/1.4944954.
Venkatesh, S., Baras, A., Lee, J. -S., and Roqan, I. S.. 2016. "The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films". United States. doi:10.1063/1.4944954. https://www.osti.gov/servlets/purl/1251395.
@article{osti_1251395,
title = {The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films},
author = {Venkatesh, S. and Baras, A. and Lee, J. -S. and Roqan, I. S.},
abstractNote = {Here, 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.},
doi = {10.1063/1.4944954},
journal = {AIP Advances},
number = 3,
volume = 6,
place = {United States},
year = {2016},
month = {3}
}