2000
DOI: 10.1103/physrevb.62.3941
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Interplay of dipolar interactions and grain-size distribution in the giant magnetoresistance of granular metals

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Cited by 52 publications
(42 citation statements)
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“…However, a small hysteresis behavior of SPM status, with coercivity up to ∼ 8.6 mT, but with a very low remanence, < 5%, was observed for the case Figure 4(b). This result proves that there can be a weak interaction between Co particles, such as a dipolar intergranular interaction that resulted in anisotropy in the system [31]. It can be also due to a slight shape and/or crystal anisotropy in these particles [32].…”
Section: Resultsmentioning
confidence: 68%
See 1 more Smart Citation
“…However, a small hysteresis behavior of SPM status, with coercivity up to ∼ 8.6 mT, but with a very low remanence, < 5%, was observed for the case Figure 4(b). This result proves that there can be a weak interaction between Co particles, such as a dipolar intergranular interaction that resulted in anisotropy in the system [31]. It can be also due to a slight shape and/or crystal anisotropy in these particles [32].…”
Section: Resultsmentioning
confidence: 68%
“…When the Co content is high enough over the percolation threshold, such as for = 0.63, the Co clusters/particles are impinged on each other or the infinite cluster/particle occupies almost the whole volume of the sample [31,33], where the magnetic properties are close to the ones of bulk ferromagnetic Co films.…”
Section: Resultsmentioning
confidence: 99%
“…Once again, by taking the saturation magnetic moment for the bulk NSMO in the FM state as 3.5 B / Mn, considering a spherical shape of the SPM clusters with an average diameter D Ӎ 4 nm ͑ac-cording to the ED analysis͒ and using an interparticle distance r Ӎ 1.5 nm, the maximum dipolar energy was estimated to be E D Ӎ 1.3ϫ 10 −19 J. This value is one order higher than that obtained for the granular SPMs, 29,31,33 which is explained by the abnormally small interparticle distance in our case. At the same time, the magnetic ͑Zeemann͒ energy, E M = H, which is included in the Langevin function ͓Eq.…”
Section: Discussionmentioning
confidence: 81%
“…As a consequence of the dipole-dipole interactions, a lower apparent moment results with respect to the interaction-free case. 4 A roughly constant interaction temperature T* ͑influenced by the temperature dependence of the saturation magnetization only͒ was obtained from the model, indicating that the dipolar interactions remain almost constant in the investigated temperature range. This is not surprising since the Curie temperatures of the Cu-Co alloys are much higher than the measuring temperatures used ͑5-700 K͒.…”
Section: Introductionmentioning
confidence: 70%