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<p>We have investigated the correlation between surface morphology and magnetotransport behavior of an undoped ZnO thin film grown by the pulsed laser deposition technique. The SEM micrograph and the corresponding particle size distribution suggest the formation of uniformly distributed and closely packed nanoscale grains over the film surface, with an average particle size of 94.26&#xa0;nm, indicating the nanocrystalline nature of the film. The magnetotransport measurements performed under applied magnetic fields of up to 15&#xa0;T exhibit negative magnetoresistance in the temperature range of 2–20&#xa0;K. A pronounced cusp-like feature near zero magnetic field is observed, which is consistent with disorder-induced quantum correction effects, including weak localization-type transport behavior. However, other disorder-related transport mechanisms may also contribute to the observed magnetotransport features. The temperature-dependent resistivity confirms the semiconducting nature of the ZnO thin film. Conductivity analysis suggests thermally activated transport in the high-temperature region, whereas Mott variable range hopping conduction dominates in the low-temperature region. These results provide insight into the low-temperature magnetotransport behavior of the undoped ZnO thin film and its potential relevance for future spintronic and magnetic sensing applications.</p>

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Observation of low-temperature negative magnetoresistance in undoped ZnO thin film

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Sheshamani Singh,
  • Neeraj Shukla

摘要

We have investigated the correlation between surface morphology and magnetotransport behavior of an undoped ZnO thin film grown by the pulsed laser deposition technique. The SEM micrograph and the corresponding particle size distribution suggest the formation of uniformly distributed and closely packed nanoscale grains over the film surface, with an average particle size of 94.26 nm, indicating the nanocrystalline nature of the film. The magnetotransport measurements performed under applied magnetic fields of up to 15 T exhibit negative magnetoresistance in the temperature range of 2–20 K. A pronounced cusp-like feature near zero magnetic field is observed, which is consistent with disorder-induced quantum correction effects, including weak localization-type transport behavior. However, other disorder-related transport mechanisms may also contribute to the observed magnetotransport features. The temperature-dependent resistivity confirms the semiconducting nature of the ZnO thin film. Conductivity analysis suggests thermally activated transport in the high-temperature region, whereas Mott variable range hopping conduction dominates in the low-temperature region. These results provide insight into the low-temperature magnetotransport behavior of the undoped ZnO thin film and its potential relevance for future spintronic and magnetic sensing applications.