Smart spinel and hexagonal ferrite nanoparticles (NPs) have been fabricated by ethylenediaminetetraacetic acid (EDTA) and cetyltrimethylammonium bromide (CTAB) assisted hydrothermal route by using NaOH solution. Electron spin resonance (ESR) measurements of the spinel and hexagonal ferrite NPs have been performed by a high sensitive conventional x˗band (~9.5–9.8 GHz) spectrometer at room temperature (RT). The measured five small g-values by ESR spectra at RT may be relevant for quantum information processing. Quantum computing and relativistic quantum computing by two-level system (qubit) have been realized by spinel type NPs at RT. Temperature evolution of magnetic hysteresis loops, magnetization, coercivity (H_C), saturation field (H_S), saturation magnetization (M_S) and remanent magnetization (M_r) have been investigated.

通过乙二胺四乙酸（EDTA）和十六烷基三甲基溴化铵（CTAB）辅助水热路径，使用NaOH溶液制备了智能尖晶石和六角形铁氧体纳米颗粒（NPs）。尖晶石和六角形铁氧体NP的电子自旋共振（ESR）测量是通过高灵敏度的常规x波段（〜9.5–9.8 GHz）光谱仪在室温（RT）下进行的。通过RT的ESR光谱测得的五个小g值可能与量子信息处理有关。通过RT的尖晶石型NP实现了由两级系统（qubit）进行的量子计算和相对论量子计算。磁滞回线的温度演变，磁化强度，矫顽力（H _C），饱和场（H _S），已经研究了饱和磁化强度（M _S）和剩余磁化强度（M _r）。