Co-occurrence of superparamagnetism and anomalous hall effect in highly reduced cobalt-doped rutile TiO2-δ films

Publication Type:

Journal Article

Authors:

S.R. Shinde; S.B. Ogale; J.S. Higgins; H. Zheng; A.J. Millis; V.N. Kulkarni; Ramamoorthy Ramesh; R.L. Greene; T. Venkatesan

Source:

Physical Review Letters, American Physical Society, Volume 92, Number 16, p.166601-1-166601-4 (2004)

Keywords:

Anomalous Hall effects (AHE), Cobalt, Coercive force, Diluted magnetic semiconductors (DMS), Doping (additives), electron diffraction, Ferromagnetism, Hall effect, Hysteresis loops, Interfaces (materials), magnetic anisotropy, Magnetic semiconductors, Magnetization, Magnetometers, nanoparticles, Remanence, Rutherford backscattering spectroscopy, SQUIDs, Superparamagnetism, Titanium dioxide, transmission electron microscopy

Abstract:

Superparamagnetizm in highly reduced cobalt (Co)-doped rutile TiO 2-δfilms displaying an anomalous Hall effect (AHE) was investigated. The presence of nanosized superparamagnetic cobalt clusters of ∼8-10 nm size in the films at the interface was established using the magnetization and transmission electron microscopy. In a single-domain particle the easy directions of magnetization were separated by the anisotropy barrier. The results indicate the co-occurrence of superparamagnetizm and AHE.

Notes:

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