Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Zn${}_{1-x}$Co${}_x$O by X-ray Magnetic Circular Dichroism

Abstract

We report on the results of x-ray absorption (XAS), x-ray magnetic circular dichroism (XMCD), and photoemission experiments on {\it n}-type Zn${}_{1-x}$Co${}_x$O ($x=0.05$) thin film, which shows ferromagnetism at room temperature. The XMCD spectra show a multiplet structure, characteristic of the Co${}^{2+}$ ion tetrahedrally coordinated by oxygen, suggesting that the ferromagnetism comes from Co ions substituting the Zn site in ZnO. The magnetic field and temperature dependences of the XMCD spectra imply that the non-ferromagnetic Co ions are strongly coupled antiferromagnetically with each other.

5pages, 4figures

References in corpus (2)

• Co-occurrence of Superparamagnetism and Anomalous Hall Effect in Highly Reduced Cobalt Doped Rutile TiO2 Films
• Electronic structures of Zn${}_{1-x}$Co${}_x$O using photoemission and x-ray absorption spectroscopy

Cited by in corpus (17)

• Magnetic defects promote ferromagnetism in Zn1-xCoxO
• Impurity-Ion pair induced high-temperature ferromagnetism in Co-doped ZnO
• Paramagnetism of the Co sublattice in ferromagnetic Zn${}_{1-x}$Co${}_x$O films
• Origin of ferromagnetism in (Zn,Co)O from magnetization and spin-dependent magnetoresistance
• Nanosized superparamagnetic precipitates in cobalt-doped ZnO
• Novel Multifunctional Materials Based on Oxide Thin Films and Artificial Heteroepitaxial Multilayers
• Indication of intrinsic room-temperature ferromagnetism in Ti1-xCoxO2-d thin film: An x-ray magnetic circular dichroism study
• Nature of magnetic coupling between Mn ions in as-grown Ga${}_{1-x}$Mn${}_x$As studied by x-ray magnetic circular dichroism
• Cationic vacancy induced room-temperature ferromagnetism in transparent conducting anatase Ti_{1-x}Ta_xO_2 (x~0.05) thin films
• Intrinsic room temperature ferromagnetism in Co-implanted ZnO
• Soft x-ray magnetic circular dichroism study of weakly ferromagnetic Zn${}_{1-x}$V${}_x$O thin film
• Relationship between charge redistribution and ferromagnetism at the heterointerface between perovskite oxides LaNiO${}_3$ and LaMnO${}_3$
• Indication of antiferromagnetic interaction between paramagnetic Co ions in the diluted magnetic semiconductor Zn${}_{1-x}$Co${}_x$O
• Local electronic structure of Cr in the II-VI diluted ferromagnetic semiconductor Zn${}_{1-x}$Cr${}_x$Te
• Spin and orbital magnetic moments of Fe in the $n$-type ferromagnetic semiconductor (In,Fe)As
• Magnetic interaction of Co ions near the {10\bar{1}0} ZnO surface
• Charge Transfer Excited State Contributions to Polarity Dependent Ferromagnetism in ZnO Diluted Magnetic Semiconductors