MAGNETIC AND TRANSPORT-PROPERTIES OF GRANULAR FE-MGF2 FILMS

Authors
FURUBAYASHI T NAKATANI I
Citation
T. Furubayashi et I. Nakatani, MAGNETIC AND TRANSPORT-PROPERTIES OF GRANULAR FE-MGF2 FILMS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 217, 1996, pp. 307-310
Citations number
10
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
217
Year of publication
1996
Pages
307 - 310
Database
ISI
SICI code
0921-5093(1996)217:<307:MATOGF>2.0.ZU;2-C
Abstract
Magnetic properties and magnetoresistance (MR) have been investigated in granular Fe-MgF2 films, which consist of metallic particles embedde d in an insulating medium. Magnetization curves in the superparamagnet ic stale are reproduced by considering magnetic dipole interactions be tween particles. A large negative MR of about 7% at 78 K is observed i n semiconducting films with the Fe composition below the percolation t hreshold. The field dependence of the MR is well described by the squa re of the magnetization. The MR effect in this system is ascribed to t he tunneling conductance between the Fe particles depending on the rel ative direction of the magnetization.