The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films
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 polaron percolation theory and variable range of hopping conduction below the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2016-03-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4944954 |
| _version_ | 1828174189949878272 |
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| author | S. Venkatesh A. Baras J.-S. Lee I. S. Roqan |
| author_facet | S. Venkatesh A. Baras J.-S. Lee I. S. Roqan |
| author_sort | S. Venkatesh |
| collection | DOAJ |
| description | 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 polaron percolation 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. |
| first_indexed | 2024-04-12T04:08:06Z |
| format | Article |
| id | doaj.art-ec2bef5e4dbd4f79a490c92f085fb775 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-12T04:08:06Z |
| publishDate | 2016-03-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-ec2bef5e4dbd4f79a490c92f085fb7752022-12-22T03:48:34ZengAIP Publishing LLCAIP Advances2158-32262016-03-0163035019035019-1010.1063/1.4944954076603ADVThe magnetic ordering in high magnetoresistance Mn-doped ZnO thin filmsS. Venkatesh0A. Baras1J.-S. Lee2I. S. Roqan3Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi ArabiaPhysical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi ArabiaStanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USAPhysical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi ArabiaWe 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 polaron percolation 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.http://dx.doi.org/10.1063/1.4944954 |
| spellingShingle | S. Venkatesh A. Baras J.-S. Lee I. S. Roqan The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films AIP Advances |
| title | The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films |
| title_full | The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films |
| title_fullStr | The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films |
| title_full_unstemmed | The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films |
| title_short | The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films |
| title_sort | magnetic ordering in high magnetoresistance mn doped zno thin films |
| url | http://dx.doi.org/10.1063/1.4944954 |
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