High Curie temperature CoSi nanowires by Mn-doping

Ángel R. Ruiz, José Hernández-Pérez, Luis F. Fonseca, Miguel José Yacamán, Eduardo Ortega, Arturo Ponce

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number213903
JournalJournal of Applied Physics
Volume124
Issue number21
DOIs
StatePublished - Dec 7 2018
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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