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Tuning resistive switching in ZnO and TiO2 nanostructures with cobalt doping.

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Title: Tuning resistive switching in ZnO and TiO2 nanostructures with cobalt doping.
Authors: Quiroz, Heiddy P.1 (AUTHOR), Terán, Cristian L.1 (AUTHOR), Calderón, Jorge A.1,2 (AUTHOR) jcalderonc5@ucentral.edu.co, Dussan, A.1 (AUTHOR) adussanc@unal.edu.co
Source: Journal of Materials Science: Materials in Electronics. Mar2025, Vol. 36 Issue 7, p1-12. 12p.
Subjects: Nonvolatile random-access memory, Oxygen vacancy, Thin films, Substrates (Materials science), Zinc oxide films
Abstract: Resistive Random Access Memories (RRAMs) traditionally utilize a metal/insulator/metal architecture. This study introduces an innovative configuration employing metal/oxide-diluted magnetic semiconductors (O-DMS)/metal on flexible substrate, leveraging the enhanced performance of magnetic control in resistive switching. We investigated the structural, morphological, magnetic, and electrical properties of cobalt-doped ZnO and TiO2 thin films, synthesized via DC magnetron sputtering. XRD measurements stablish the presence of Co3O4 phases in the samples of Co-doped ZnO thin films with substrate temperature (Ts) of 423 K, while Raman spectra of Co-doped TiO2 thin film not evidencing the formation of the Co–O binary phases associated to the low substrate temperature (Ts = 293 K). High-resolution SEM and AFM analyses revealed the formation of small grains on the film surfaces, indicative of the growth mechanisms. When Co target power was increased between 20 and 40 W, the grain size increased from 158.89 ± 4.76 nm to 460.97 ± 13.82 nm. Electrical and magnetic characterizations demonstrated contributions from lattice free electrons, generated by oxygen vacancies, and randomly distributed Co ions within the oxide semiconductor matrix, influencing the SET and RESET states. Comparative analysis of ZnO and TiO2 matrices indicated reduced energy consumption and increased storage capacity, attributed to the modulation of high and low resistive states by magnetic ions within the semiconductor matrix, associated to change between low resistive state (LRS) and HRS occurs (~ 1–3 V). [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Tuning resistive switching in ZnO and TiO<subscript>2</subscript> nanostructures with cobalt doping.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%3A+Materials+in+Electronics%22">Journal of Materials Science: Materials in Electronics</searchLink>. Mar2025, Vol. 36 Issue 7, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Nonvolatile+random-access+memory%22">Nonvolatile random-access memory</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+vacancy%22">Oxygen vacancy</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Substrates+%28Materials+science%29%22">Substrates (Materials science)</searchLink><br /><searchLink fieldCode="DE" term="%22Zinc+oxide+films%22">Zinc oxide films</searchLink>
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  Data: Resistive Random Access Memories (RRAMs) traditionally utilize a metal/insulator/metal architecture. This study introduces an innovative configuration employing metal/oxide-diluted magnetic semiconductors (O-DMS)/metal on flexible substrate, leveraging the enhanced performance of magnetic control in resistive switching. We investigated the structural, morphological, magnetic, and electrical properties of cobalt-doped ZnO and TiO2 thin films, synthesized via DC magnetron sputtering. XRD measurements stablish the presence of Co3O4 phases in the samples of Co-doped ZnO thin films with substrate temperature (Ts) of 423 K, while Raman spectra of Co-doped TiO2 thin film not evidencing the formation of the Co–O binary phases associated to the low substrate temperature (Ts = 293 K). High-resolution SEM and AFM analyses revealed the formation of small grains on the film surfaces, indicative of the growth mechanisms. When Co target power was increased between 20 and 40 W, the grain size increased from 158.89 ± 4.76 nm to 460.97 ± 13.82 nm. Electrical and magnetic characterizations demonstrated contributions from lattice free electrons, generated by oxygen vacancies, and randomly distributed Co ions within the oxide semiconductor matrix, influencing the SET and RESET states. Comparative analysis of ZnO and TiO2 matrices indicated reduced energy consumption and increased storage capacity, attributed to the modulation of high and low resistive states by magnetic ions within the semiconductor matrix, associated to change between low resistive state (LRS) and HRS occurs (~ 1–3 V). [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Oxygen vacancy
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      – TitleFull: Tuning resistive switching in ZnO and TiO2 nanostructures with cobalt doping.
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              Text: Mar2025
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