English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Magnetic state of exchanged biased CoO(20nm)/Co($d_F$) bilayer ($d_F$=5-20nm)was studied by means of polarized neutron reflectometry. By spacing of CoO/Cobilayer and Al$_2$O$_3$ substrate with Nb(20nm) layer we created waveguidestructure which allowed us to significantly enhance intensity of spin-flip (SF)scattering in the position of optical resonances. For the trained sample withthinnest Co(5nm) we detected strong SF scattering at the resonance position (upto 30\% of incoming intensity) speaking about high non-collinearity of thesystem. As $d_F$ increases, the intensity of SF scattering linearly decreases.At the same time we observed asymmetry of up-down and down-up scatteringchannels at the resonance positions. We attribute this asymmetry to the Zeemansplitting of neutrons energies with different initial polarization taking placein high external field. Analysis, however, shows that the applied in the PNRexperiment external field is not enough to quantitatively explain the observedasymmetry for the samples with $d_F > $ 5nm and we have to postulate presenceof additional magnetic field produced by sample. We attribute this additionalfield to the stray field produced by chiral Bloch domain walls. The chiralityof the domain walls can be explained by Dzyaloshinskii-Moriya interactionarising at the CoO/Co interface. Our results can be useful for designing ofspintronic devices using exchange bias effect.

Chirality of Bloch domain walls in exchange biased CoO/Co bilayer seen by waveguide-enhanced neutron spin-flip scattering