Negative differential resistance (NDR) and hysteresis effects have been successfully achieved by synthesizing DNA-immobilized CoFe ₂ O ₄ 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 CoFe ₂ O ₄ 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固定化的CoFe ₂ O ₄磁性纳米粒子：表现出负差电阻和磁滞效应的自然友好材料。

通过使用湿法化学共沉淀法合成固定化DNA的CoFe ₂ O ₄磁性纳米粒子，已成功实现了负差分电阻（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存储器存储设备的多种下一代应用打开大门。在此，对于电特性分析中的正偏压和负偏压条件，都发现了可重现的NDR峰。对于与CoFe ₂ O ₄具有最大DNA结合的样品 还发现了磁性纳米颗粒具有一致的磁滞效应。由于分别在分子水平上增加了DNA和极化子转化现象，这两个特征（即NDR和磁滞现象）都可以归因于晶体结构的构象变化。通过在一种材料中实现这两个功能，可以开发出用于分子电子应用的多功能设备。