Abstract
Low temperature Co K-edge x-ray magnetic circular dichroism spectra at different field cooling conditions were recorded to study the imprinted magnetization in antiferromagnetic (AFM) Co doped ZnO (Co:ZnO) films which manifests itself in a vertical exchange bias effect. Co:ZnO films with 50% and 60% doping concentrations were investigated to provide a high degree of pinned magnetic moments. The measurements reveal a change at the main absorption energy of the spectra, while the signal obtained at the pre-edge stays unaffected by the cooling conditions. Therefore, the pinned uncompensated AFM moments, resulting in an imprinted magnetization, are predominantly of orbital character and are independent of ferromagnetic layers.
Highlights
The exchange interaction between a ferromagnet (FM) and an antiferromagnet (AFM) in a layered structure is called an exchange bias.[1,2] Since its discovery in 1956 by Meiklejohn and Bean,[1] the correct prediction of the exchange bias field is challenging
Low temperature Co K-edge x-ray magnetic circular dichroism spectra at different field cooling conditions were recorded to study the imprinted magnetization in antiferromagnetic (AFM) Co doped ZnO (Co:ZnO) films which manifests itself in a vertical exchange bias effect
Co:ZnO films with 50% and 60% doping concentrations were investigated to provide a high degree of pinned magnetic moments
Summary
The exchange interaction between a ferromagnet (FM) and an antiferromagnet (AFM) in a layered structure is called an exchange bias.[1,2] Since its discovery in 1956 by Meiklejohn and Bean,[1] the correct prediction of the exchange bias field is challenging. It is used in technical applications, e.g., in magnetic recording heads[3] or magnetic memories.[4]. The studied Co/ FeMn films exhibit mainly a field like exchange bias (horizontal shift) by the interaction with the FM Co layer.
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