Room-Temperature Ferromagnetism in Doped Face-Centered Cubic Fe Nanoparticles (pages 804–809)
Bingqing Wei, Mutsuhiro Shima, Ranjit Pati, Saroj K. Nayak, David J. Singh, Renzhi Ma, Yubao Li, Yoshio Bando, Saburo Nasu and Pulickel M. Ajayan
Version of Record online: 7 APR 2006 | DOI: 10.1002/smll.200500436
About face: Fe–C alloys and face-centered cubic (fcc) Fe are not ferromagnetic under ambient conditions, but ferromagnetism has been observed in elongated nanoparticles of fcc Fe formed inside carbon nanotubes (see figure). The magnetic moment and hyperfine fields in 57Fe Mössbauer spectroscopy are explained by C atoms at octahedral interstitial sites in an expanded fcc Fe lattice.