Abstract
We report on the synthesis, structure and magnetic properties of a novel exchange bias system with Cr 2O 3/CrO 2/Cr 2O 5 interfaces. Chromium oxide particles with mixed chromium valences were prepared by sintering CrO 3 in air. X-ray diffraction patterns show that CrO 3 lost its oxygen gradually with increasing temperature and time through Cr 3O 8, Cr 2O 5, CrO 2, and finally Cr 2O 3 at temperatures above 760 K. X-ray photoelectron spectra indicate a low CrO 2 content and a binding energy of 579.3 eV for Cr 2 p 3/2 photoelectrons in Cr 2O 5. Chromium dioxide was found to stably coexist with Cr 2O 3 and Cr 2O 5 in the particles. Magnetic measurements show hysteresis loop shifts in the sample, indicating an exchange bias induced by antiferromagnetic Cr 2O 3/Cr 2O 5 in ferromagnetic CrO 2. An exchange bias of 9 mT at 5 K and a coercivity of 26.3 mT were observed in the chromium oxide particles containing CrO 2.
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