Open AccessMicromagnetics study of the magnetic nano-granular films
Author(s) -
Jiang Jian-jun,
Y. A. Lin,
Lianwen Deng,
Hao He
Publication year - 2006
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.55.3043
Subject(s) - micromagnetics , percolation threshold , condensed matter physics , materials science , percolation (cognitive psychology) , nano , permeability (electromagnetism) , granular material , magnetic nanoparticles , magnetization , nanotechnology , nanoparticle , magnetic field , physics , composite material , electrical resistivity and conductivity , chemistry , biochemistry , quantum mechanics , neuroscience , membrane , biology
The nano-granular magnetic films were investigated using the micromagnetics method in this paper. The nano-granular magnetic film model studied consisted of an aggregate of 122 spherical nano-granules with an fcc structure. The computational results showed that the effect of the dipolar interaction of the system on the static magnetic structure is remarkable, while the effect of exchange interaction is indistinc. The frequency dependent permeability spectra of granular films with different volume ratio of magnetic components were simulated and the percolation phenomena of nanostructural magnetic films were extensively analyzed. Thus, the percolation threshold of the system studied was obtained according to the effective medium theory. Furthermore, the design of nano-granular magnetic films with large magnetic losses were carried out.