Negative differential resistance (NDR) and hysteresis effects have been successfully achieved by synthesizing DNA-immobilized CoFe2O4 magnetic nanoparticles using wet chemical co-precipitation method. These multiple effects in a single compound particle can open the door for several next generation applications from high frequency communication device development to memory storage device. Here, for both positive and negative bias condition during electrical characterization, reproducible NDR peaks have been found. For the sample with maximum DNA conjugation with CoFe2O4 magnetic nanoparticles consistent hysteresis effects have also been found. Both of these features i.e., NDR and hysteresis can be attributed to conformational changes in crystal structure due to addition of DNA and polaron transform phenomena at the molecular level, respectively. By achieving these two features in one material, multifunctional devices can be developed for molecular electronic applications.

中文翻译：

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DNA 固定 CoFe2O4 磁性纳米颗粒：一种表现出负微分电阻和磁滞效应的自然友好材料


采用湿化学共沉淀法合成DNA固定CoFe2O4磁性纳米颗粒，成功实现了负微分电阻（NDR）和磁滞效应。单个复合粒子中的这些多重效应可以为从高频通信设备开发到内存存储设备的多种下一代应用打开大门。在这里，对于电气表征过程中的正偏压和负偏压条件，都发现了可重现的 NDR 峰值。对于具有最大 DNA 与 CoFe2O4 磁性纳米粒子缀合的样品，还发现了一致的磁滞效应。这两个特征（即 NDR 和滞后）可分别归因于由于 DNA 的添加和分子水平上的极化子变换现象而导致的晶体结构的构象变化。通过在一种材料中实现这两个功能，可以开发用于分子电子应用的多功能器件。