Title :
Magnetic structure and anisotropy of fcc-iron nanoclusters trapped in carbon nanotube
Author :
Shima, M. ; Nayak, S.K. ; Nasu, S. ; Ajayan, P.M.
Author_Institution :
Rensselaer Polytech. Inst., Troy, NY, USA
Abstract :
Mossbauer spectroscopy combined with SQUID magnetometry was carried out in an applied magnetic field of up to 1 T at temperatures between 5 K and 300 K to investigate the atomic-level magnetic structure of the fcc-Fe nanoparticles. The corner Fe atoms in the fcc unit cell are in a high spin state, while the face-centered Fe atoms are in a low spin state when an interstitial carbon atom exists in the nearest neighbor, but the face-centered Fe have no moment without a nearest neighbor carbon.
Keywords :
Mossbauer effect; carbon nanotubes; ferromagnetic materials; high spin states; interstitials; iron; magnetic anisotropy; magnetic particles; magnetic structure; nanoparticles; 1 T; 5 to 300 K; C; Fe; Mossbauer spectroscopy; SQUID magnetometry; atomic-level magnetic structure; carbon nanotube; corner atoms; face-centered atoms; fcc unit cell; fcc-iron nanoclusters; high spin state; interstitial atom; magnetic anisotropy; nearest neighbor atom; Anisotropic magnetoresistance; Carbon nanotubes; Iron; Magnetic anisotropy; Magnetic fields; Nearest neighbor searches; Perpendicular magnetic anisotropy; SQUIDs; Spectroscopy; Temperature;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464081
