Surface-enhanced Raman scattering for magnetic semiconductor ZnSe:Fe hybrid structures

Growth and Properties of Electrodeposited ZnSe-Fe and ZnSe-Co Granular Films

“…Although the Raman spectra of the ZnSe-Co films are very similar to the ZnSe-Fe films, an enhancement of the Raman intensity of the ZnSe peak was solely observed in the granular films with Fe content. 20 This effect is mainly due to the resonance excitations of surface plasmons of the metallic clusters which correlates with the film morphologies, rather than Fe and Co content inside the films.…”

“…18 Morphology and crystalline structure of these granular films and their correlation to surface-enhanced Raman scattering were reported elsewhere. 19,20 In this work we discuss important aspects of the growth process. Furthermore, we characterize optical and magnetic properties of these granular films by employing Raman and photoemission spectroscopies, cathodoluminescence, and superconducting quantum interference device ͑SQUID͒ magnetometry.…”

Electromagnetism and magnetization in granular two-phase nanocomposites: A comparative microwave study

“…20 For example, two effects may become important: ͑1͒ the band gap of semiconductor crystalline particles, where the motion of electrons ͑or holes͒ is limited in all three dimensions, can increase by several eV with respect to the macroscopic counterpart with decreasing particle size; ͑2͒ the 3d electrons of the atoms on the surface of nanoparticles are more localized and have larger orbital magnetic moments, leading to an enhanced uniaxial magnetic anisotropy. 1, [22][23][24][38][39][40][41][42][43][44][45][46][47][48][49][50] In this context, current consensus is that the following questions have not been definitively answered: ͑1͒ How does a powder compact consisting of many grain boundaries behave magnetically, and how can the nanoparticles be densified into a bulk material while retaining the nanostructure of these particles? 3 Although recent studies from this laboratory [22][23][24][25][26][27] and other research groups [28][29][30] have shown that selected metal and metal oxide nanostructures have demonstrated their promise as high quality soft magnetic materials for high frequency applications, our understanding of the electromagnetism of granular nanophases is still far from the level achieved for bulk materials.…”

Microstructure and magnetism of Fe nanoparticles embedded in Al2O3 ZnO matrix

“…Materials consisting of nanosized magnetic particles embedded in a host matrix have received considerable attention since they exhibit a wide variety of interesting properties [1] with possibility for use in various technological applications [2]. For instance, composite systems comprising nanoparticles of magnetic transition metals, such as Fe, Co, Ni, embedded in either a metallic, insulating or semiconducting matrix are of interest due to their peculiar magnetic and magnetotransport properties like enhanced coercivity [3], superparamagnetism [4], giant magnetoresistance [5], tunelling magnetoresistance [6] or surface-enhanced Raman scattering [7]. As applications of the magnetic nanoscaled materials, magnetic field sensors and high-density magnetic recording media, are potential candidates.…”