Relationship Between Structure and Magnetic Behaviour in ZnO-Based Systems

This work studies the magnetic behavior of ZnO nanoparticles capped with different organic molecules and showing room-temperature ferromagnetism (RTFM). Of particular significance is the combination of element-specific X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) techniques, which demonstrates the intrinsic occurrence of RTFM in these systems and indicates that it is not related to the 3-D states of the metallic cation but is relayed along the conduction band of the semiconductor. The discovery of room-temperature ferromagnetism (RTFM) in semiconductors holds great promise in future spintronics technologies.
Further results presented here include O K-edge XMCD studies, which demonstrate that the oxygen ions have a ferromagnetic response in these ZnO-based systems, providing the first direct support for claims regarding the appearance of oxygen ferromagnetism in oxide semiconductors at the nanoscale.

Sommario

Introduction.- Synthesis and In-House Characterization.- XAS and XMCD Spectroscopies.- Zinc K-Edge X-Ray Absorption Study.- Zinc K-Edge XMCD Study.- Soft X-Ray XAS and XMCD Study.- Summary and Conclusions.- Appendices.- Bibliography.

Riassunto

This work studies the magnetic behavior of ZnO nanoparticles capped with different organic molecules and showing room-temperature ferromagnetism (RTFM). Of particular significance is the combination of element-specific X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) techniques, which demonstrates the intrinsic occurrence of RTFM in these systems and indicates that it is not related to the 3-D states of the metallic cation but is relayed along the conduction band of the semiconductor. The discovery of room-temperature ferromagnetism (RTFM) in semiconductors holds great promise in future spintronics technologies.  
Further results presented here include O K-edge XMCD studies, which demonstrate that the oxygen ions have a ferromagnetic response in these ZnO-based systems, providing the first direct support for claims regarding the appearance of oxygen ferromagnetism in oxide semiconductors at the nanoscale.

Dettagli sul prodotto

• Autori: Clara Guglieri, Clara Guglieri Rodríguez
• Editore: Springer, Berlin
• Lingue: Inglese
• Formato: Tascabile
• Pubblicazione: 01.01.2016
• EAN: 9783319386850
• ISBN: 978-3-31-938685-0
• Pagine: 146
• Dimensioni: 155 mm x 236 mm x 10 mm
• Peso: 260 g
• Illustrazioni: XIV, 146 p. 104 illus., 52 illus. in color.
• Serie: Springer Theses; Springer Theses
• Categorie: Scienze naturali, medicina, informatica, tecnica > Fisica, astronomia > Fisica atomica, fisica nucleare; B, Quantum physics (quantum mechanics & quantum field theory), Materials science, Physics and Astronomy, Electronic devices & materials, Semiconductors, Magnetism, Magnetic materials, Magnetism, Magnetic Materials, Materials—Surfaces, Interfaces (Physical sciences), Surface and Interface Science, Thin Films, Surface chemistry & adsorption, Surface and Interface and Thin Film, Thin films, Surfaces and Interfaces, Thin Films, Surfaces, Interfaces and Thin Film, Surfaces (Physics), Quantum computers, Spintronics, Quantum Information Technology, Spintronics