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We have employed hard x-ray resonant magnetic scattering to study the bulk antiferromagnetic domain state of the archetypal epitaxial Ni81Fe19(111)/CoO(111) exchange biased bilayer (Ni81Fe19 = Permalloy = Py). Tuning the x-ray energy to the Co K-edge, we were able to detect the () antiferromagnetic magnetic Bragg reflection from a 2000 A thick CoO film covered by a 120 A Py layer and capped by 50 A gold. The temperature dependence of the () Bragg intensity and the rocking-width agrees well with previous neutron diffraction data. The average lateral size of antiferromagnetic domains is about 40 nm close to TN = 291 K.

Hard x-ray resonant scattering study of Ni81Fe19(111)/CoO(111) exchange biased bilayer

Hard x-ray resonant scattering study of Ni₈₁Fe₁₉(111)/CoO(111) exchange biased bilayer