Transport properties, microstructures and domain observation in Ag 1-x -(Ni 0.8 Co 0.2 ) x granular films

The effect of the size distribution on the giant magnetoresistance in magnetic granular films

“…From Fig. 5, it is clear that the GMR first increases and then decreases with increasing volume fraction at both 4 K and 300 K, exhibiting a maximum at p ≈ 0.3, which is qualitatively identical to the experiment [32,33]. To understand this feature, we consider that the GMR increases with the volume fraction in the magnetically diluted region because of an increasing concentration of magnetic scattering centres.…”

A phenomenological theory of the granular size effect on the giant magnetoresistance of granular films

“…4(a), it is clear that the change of GMR as a function of volume fraction do not show the same tendency at 4 and 300 K, while in Fig. 4(c) GMR increases monotonically with increasing volume-fraction both at 4 K and 300 K, which is not in agreement with some experiments [31][32][33]. In Fig.…”

“…In Fig. 4 [31][32][33], consequently, single domain ferromagnetic granules are considered as a key role in GMR. From the above phenomenological calculation, it can be found that only when single domain ferromagnetic granules possess larger spin-asymmetric scattering factor as weight with GMR, the calculated results are in agreement with the various experiments reported, from which it indicates that single domain ferromagnetic granules play a key role in GMR.…”