Open AccessA PHENOMENOGICAL THEORY FOR GIANT MAGNETO-RESISTANCE IN NON-DISSOLUBLE MAGNETIC GRANULAR ALLOYS
Author(s) -
Zhao Ping-Bo,
Bo-Zang Li,
Pu Fu-Ke
Publication year - 1996
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.45.1191
Subject(s) - condensed matter physics , giant magnetoresistance , autocorrelation , magnetic field , impurity , electrical resistivity and conductivity , magneto , magnetoresistance , physics , scattering , materials science , quantum mechanics , statistics , mathematics , power (physics)
In virtue of stochastic autocorrelation function description of the impurity scattering potential in non-dissoluble magnetic-nonmagnetic granular films, we find a relationship between the resistivity of system and the size of gruanules. Furthermore, by introducing a phenomenological factor to account for the increase of correlation length caused by the external magnetic field, we get an analytical ex-pression for the giant magnetoresistance coffiecient. The calculations show that our theory agrees qualitatively with the experimental results.