LAUSR

We report the synthesis of high Curie temperature (TC > 800 K) Mn-doped CoSi nanowires. CoSi and Co1–xMnxSi nanowires were synthesized by chemical vapor deposition. Transmission electron microscopy was used to identify a crystalline B20 cubical structure. Zero-field cooling and field cooling measurements confirm spin disorder behaviour at low temperatures. The magnetic properties of doped samples were explained by means of the Ruderman-Kittel-Kasuya-Yosida interaction where the localized Mn atoms interact with the conduction electrons in CoSi providing a net ferromagnetic moment and explaining spin disorder at low temperatures. An individual CoSi nanowire was experimentally analyzed by performing off-axis electron holography, providing information about its local magnetization. Density functional theory calculations were performed to understand the effects of Mn doping, Si-vacancies, and surface atoms in the magnetic properties at the surface of the nanowire. An estimation of the Curie temperature was made using the mean field approximation.We report the synthesis of high Curie temperature (TC > 800 K) Mn-doped CoSi nanowires. CoSi and Co1–xMnxSi nanowires were synthesized by chemical vapor deposition. Transmission electron microscopy was used to identify a crystalline B20 cubical structure. Zero-field cooling and field cooling measurements confirm spin disorder behaviour at low temperatures. The magnetic properties of doped samples were explained by means of the Ruderman-Kittel-Kasuya-Yosida interaction where the localized Mn atoms interact with the conduction electrons in CoSi providing a net ferromagnetic moment and explaining spin disorder at low temperatures. An individual CoSi nanowire was experimentally analyzed by performing off-axis electron holography, providing information about its local magnetization. Density functional theory calculations were performed to understand the effects of Mn doping, Si-vacancies, and surface atoms in ...