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Relationship Between Structure and Magnetic Behaviour in ZnO-Based Systems

Clara Guglieri Rodríguez

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Springer International Publishing img Link Publisher

Naturwissenschaften, Medizin, Informatik, Technik / Atomphysik, Kernphysik

Beschreibung

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.

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Schlagwörter

Zinc oxide nanoparticles, Core-shell structure, X-ray absorption spectroscopy, Surface magnetism, X-ray magnetic circular dichroism, Magnetic semiconductors