We report the observation of an exchange biasing of ferromagnetic Cr-doped GaN films by an antiferromagnetic MnO overlayer. The center of the magnetic hysteresis loop shifts to a negative magnetic field by ∼70 Oe when measured after a positive field cooling. An enhancement of the coercive field of the Cr-doped GaN film is also found when the exchange-biasing MnO overlayer is present. The mechanism responsible for the exchange bias is attributed to the exchange coupling at the ferromagnetic Cr-GaNantiferromagnetic MnO interface.
ASJC Scopus subject areas
- Physics and Astronomy(all)