TY - JOUR
T1 - Evidence of oxygen ferromagnetism in ZnO based materials
AU - Guglieri, Clara
AU - Céspedes, Eva
AU - Espinosa, Ana
AU - Laguna-Marco, María Ángeles
AU - Carmona, Noemi
AU - Takeda, Yukiharu
AU - Okane, Tetsuo
AU - Nakamura, Tetsuya
AU - García-Hernández, Mar
AU - García, Miguel Ángel
AU - Chaboy, Jesús
PY - 2014/4/9
Y1 - 2014/4/9
N2 - Discoveries of room-temperature ferromagnetism (RTFM) in semiconductors hold great promise in future spintronics technologies. Unfortunately, this ferromagnetism remains poorly understood and the debate concerning the nature, carrier-mediated versus defect-mediated, of this ferromagnetism in semiconducting oxides is still open. Here, by using X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD), it is demonstrated that the oxygen ions have a ferromagnetic response in different ZnO-based compounds showing RTFM behavior: ZnO nanoparticles capped with organic molecules and ZnO/ZnS heterostructures. These results demonstrate the intrinsic occurrence of RTFM in these systems, and point out that it is not related to the metallic cation but it relays on the conduction band of the semiconductor.
AB - Discoveries of room-temperature ferromagnetism (RTFM) in semiconductors hold great promise in future spintronics technologies. Unfortunately, this ferromagnetism remains poorly understood and the debate concerning the nature, carrier-mediated versus defect-mediated, of this ferromagnetism in semiconducting oxides is still open. Here, by using X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD), it is demonstrated that the oxygen ions have a ferromagnetic response in different ZnO-based compounds showing RTFM behavior: ZnO nanoparticles capped with organic molecules and ZnO/ZnS heterostructures. These results demonstrate the intrinsic occurrence of RTFM in these systems, and point out that it is not related to the metallic cation but it relays on the conduction band of the semiconductor.
KW - magnetic semiconductors
KW - oxide surfaces
KW - surface magnetism
KW - X-ray absorption spectroscopy
KW - X-ray magnetic circular dichroism
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U2 - 10.1002/adfm.201303087
DO - 10.1002/adfm.201303087
M3 - Article
AN - SCOPUS:84897997107
SN - 1616-301X
VL - 24
SP - 2094
EP - 2100
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 14
ER -