Title :
Percolation threshold and tunneling magnetoresistance in Ag/Ni nanocompacts
Author :
Wu, S.Y. ; Liao, M.T. ; Huang, F.J. ; Tsao, F.C. ; Chung, M.K. ; Yang, C.C. ; Li, W.-H.
Author_Institution :
Dept. of Phys., Nat. Central Univ., Chung-li, Taiwan
Abstract :
The transport and magnetic behaviors of a series of seven two-component (Ag)x(Ni)100-x nanocompacts , each with a different Ag/Ni mass ratio, are studied with and without the presence of an applied magnetic field. A percolation threshold is found at 30% Ag concentration, higher than which metallic transport is observed. Using the tunneling magnetoresistance mechanism, the magnetorestrictive behaviors of the nanocompacts is investigated. It is observed that the TMR effects become diminshing in low Ni concentration nanocompacts.
Keywords :
magnetostriction; nanoparticles; nickel alloys; percolation; silver alloys; tunnelling magnetoresistance; AgxNi100-x; magnetorestrictive behaviors; mass ratio; metallic transport; percolation threshold; tunneling magnetoresistance; tunneling magnetoresistance mechanism; two-component nanocompacts; Composite materials; Conducting materials; Conductivity; Couplings; Electrons; Magnetic separation; Nanoparticles; Physics; Temperature; Tunneling magnetoresistance;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463956
