Size effect on magnetism of Fe thin films in Fe/Ir superlattices

Details Size effect on magnetism of Fe thin films in Fe/Ir superlattices Size effect on magnetism of Fe thin films in Fe/Ir superlattices

2001-02-28

arxiv.org/abs/cond-mat/0102514v1

Phys. Rev. Lett. 86 (2001) 3883

Physics

Condensed Matter

Materials Science

LaTeX file with Revtex, 5 pages, 5 eps figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.3883

In ferromagnetic thin films, the Curie temperature variation with the thickness is always considered as continuous when the thickness is varied from $n$ to $n+1$ atomic planes. We show that it is not the case for Fe in Fe/Ir superlattices. For an integer number of atomic planes, a unique magnetic transition is observed by susceptibility measurements, whereas two magnetic transitions are observed for fractional numbers of planes. This behavior is attributed to successive transitions of areas with $n$ and $n+1$ atomic planes, for which the $T_c$'s are not the same. Indeed, the magnetic correlation length is presumably shorter than the average size of the terraces. Monte carlo simulations are performed to support this explanation.

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