We investigate the influence of naturally grown 2-5 nm thin surface layer of antiferromagnetic (AFM) Cr 2O 3 on the half metallic ferromagnet CrO 2 by measuring the magnetic behavior of a single micro-crystal. The temperature variation of the magnetic stray fields of the micro-crystal measured by micro-Hall magnetometry shows an anomalous increase below ∼ 60 K. We find clear evidence that this behavior is due to the influence of the AFM surface layer. The average amplitude of the Barkahausen jumps exhibits a similar temperature dependence indicating that the AFM surface layer plays a role in defining the potential landscape seen by the domain configuration in the ferromagnetic grain.
ASJC Scopus subject areas
- Physics and Astronomy(all)