Magnetic and Magneto-Optical Properties of Sputtered Co-CeO₂ Thin Films on Al₂O₃ (0001) Substrates with (100) Orientation

Abstract

Diluted magnetically doped CeO2 films is an attractive dilute magnetic oxide which would facilitate the practical realization of spintronic devices and may also be used to explore novel magneto-optical applications. In this experiments, 3 at% cobalt-doped CeO2 films with the stoichiometry of Ce0.97Co0.03O2-δ (CCO) were deposited by magnetron sputtering methods on Al2O3 (0001) substrates. The structural, magnetic, and magneto-optical properties were investigated. The results indicate that CCO films with CeO2 (100) orientation can readily be obtained via magnetron sputtering on Al2O3 (0001) substrates. Films are ferromagnetic at room temperature, which is anisotropic with an out-of-plane magnetization easy axis. Magneto-optical measurements exhibit a giant Faraday rotation of about 4800 deg/cm at 650 nm wavelength in out-of-plane direction. The excellent room-temperature ferromagnetism and the giant Faraday rotation in CCO films show highly potential applications in novel magneto-optical devices as well as in spintronics.

Photon‐Induced Spintronic Polaron Channel Modulator of CeO2‐x NP Thin Films Hydrogen Evolution Cells

“…From the simulation result of adding excess electron to bulk CeO 2 , 4 f characteristic state shows the spin‐up channel . The optical spin converting to orbital angular momentum is achieved by selecting the coherent circular polarization light with ħ and − ħ angular momentum irradiation to generate the spin current from CeO 2 NP thin films, which is called spin injection . The major two characteristics, spin and orbital forms of photon, are utilized to generate spin current from inhomogeneous and anisotropic medium .…”