Magnetic Properties of Granular Nickel Films

Gittleman, J. I.; Goldstein, Y.; Bozowski, S.

doi:10.1103/physrevb.5.3609

Cited by 378 publications

(196 citation statements)

References 18 publications

Supporting

Mentioning

176

Contrasting

Unclassified

Order By: Relevance

“…25 However, the relation between magnetism and magnetotransport in granular metals is still an open question, since there are systems showing strong temperature dependence of TMR. 19,26,27 Some of these examples show the distinctive 1 / T decay of TMR of the Helman-Abeles model. 20 Moreover, it is well known that imperfect metal-insulating interfaces and spin-flip scattering, due to, e.g., surface spin disorder and paramagnetic spins in the matrix, lead to an additional temperature decrease in TMR.…”

Section: Introductionmentioning

confidence: 99%

Tunneling magnetoresistance inCo−ZrO2granular thin films

et al. 2006

View full text Add to dashboard Cite

Granular films composed of well defined nanometric Co particles embedded in an insulating ZrO 2 matrix were prepared by pulsed laser depositon in a wide range of Co volume concentrations ͑0.15Ͻ x Ͻ 0.43͒. High-resolution transmission electron microscopy ͑TEM͒ showed very sharp interfaces between the crystalline particles and the amorphous matrix. Narrow particle size distributions were determined from TEM and by fitting the low-field magnetic susceptibility and isothermal magnetization in the paramagnetic regime to a distribution of Langevin functions. The magnetic particle size varies little for Co volume concentrations x Ͻ 0.32 and increases as the percolation limit is approached. The tunneling magnetoresistance ͑TMR͒ was successfully reproduced using the Inoue-Maekawa model. The maximum value of TMR was temperatureindependent within 50-300 K, and largely increased at low T, suggesting the occurrence of higher-order tunneling processes. Consequently, the tunneling conductance and TMR in clean granular metals are dominated by the Coulomb gap and the inherent particle size distribution.

show abstract

Section: Introductionmentioning

confidence: 99%

Tunneling magnetoresistance inCo−ZrO2granular thin films

et al. 2006

View full text Add to dashboard Cite

show abstract

“…By assuming, for simplicity, that all the nanoclusters have equal magnetic moment and interparticle distance, and that the statistical average of ͗ ជ i · ជ j ͘ along the field direction gives 32 where is the magnetic moment of SPM particle and ij is the angle between magnetic moments of adjacent clusters, the dipolar energy can be expressed to be E D = 2 ͑M / M S ͒ 2 / r 3 . Let us estimate the maximum value of the dipolar energy for the nanoclustered film.…”

Section: Discussionmentioning

confidence: 99%

Microstructures and the corresponding magnetic properties of half-doped Nd0.5Sr0.5MnO3 films

Prokhorov

Hyun

Park

et al. 2008

Journal of Applied Physics

View full text Add to dashboard Cite

The microstructural and magnetic properties of amorphous, nanoclustered, and self-organized bilayer Nd 0.5 Sr 0.5 MnO 3 films, prepared by rf magnetron sputtering, are investigated. The amorphous film was found to be a typical paramagnet with free motion of the individual Mn spins, and the magnetic properties are well described on the basis of the Curie-Weiss approximation. The nanoclustered film manifests magnetic properties mimicking those of superparamagnetic particles following nonclassical magnetic dynamics. The self-organized bilayer film demonstrates a negative exchange bias typical of a ferromagnet/antiferromagnet hybrid system, in spite of the fact that both layers have a ferromagnetic origin. The magnetic properties of the films are discussed in detail on the basis of modern theoretical models.

show abstract

“…For applied ± H the resistance decreases until, for large enough field, it reaches saturation. This behavior was observed in a variety of granular samples [1,2,3,4,5,6,7] and has been ascribed to spin dependent tunneling between randomly oriented magnetic moments of the grains [8,9]. Applying a magnetic field aligns these moments, causing the tunneling resistance to decrease.…”

Section: Introductionmentioning

confidence: 95%

Magnetoresistance of mesoscopic granular ferromagnets

2005

View full text Add to dashboard Cite

We have performed magnetoresistance (MR) measurements of granular ferromagnets having lateral dimensions smaller than 0.5 µm and containing a small number of grains (down to about 100). Compared to macroscopic samples, these granular samples exhibit unusually large saturation fields and MR amplitudes. In addition, the evolution of the magnetoresistance curve as the intergrain distance decreases is qualitatively different than that of large samples. We discuss these results and suggest that they reflect a transition from percolation to quasi single-channel dominated transport.

show abstract

Magnetic Properties of Granular Nickel Films

Cited by 378 publications

References 18 publications

Tunneling magnetoresistance inCo−ZrO2granular thin films

Tunneling magnetoresistance inCo−ZrO2granular thin films

Microstructures and the corresponding magnetic properties of half-doped Nd0.5Sr0.5MnO3 films

Magnetoresistance of mesoscopic granular ferromagnets

Contact Info

Product

Resources

About