Prados, C.Crespo del Arco, PatriciaGonzález, J. M.Hernando Grande, AntonioMarcos, J. F.Gancedo, R.Grobert, N.Terrones, M.Walton, R. M.Kroto, H. W.2023-06-202023-06-202002-03-151098-012110.1103/PhysRevB.65.113405https://hdl.handle.net/20.500.14352/60113©2002 The American Physical SocietyThe phase distribution of high aspect ratio, Fe-filled carbon nanotubes prepared by pyrolyzing a mixture of powered ferrocene and C_(60) has been determined by means of Mössbauer spectroscopy. Our results for that characterization are closely related to the observation, after field cooling processes, of a hysteresis loop shift and clearly suggest a spatial phase distribution which includes the presence of a g-Fe/α-Fe interface. The temperature ependence of the hysteresis loop shift is discussed in terms of localized regions at that interface exhibiting uncompensated antiferromagnetism within reduced dimensions.engjournal articlehttp://dx.doi.org/10.1103/PhysRevB.65.113405https://journals.aps.orgopen access538.9PhysicsCondensed matterFísica de materialesFísica del estado sólido2211 Física del Estado Sólido