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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this study we investigate the exchange coupling between the hard magneticcompound MnBi and the soft magnetic alloy FeCo including the interfacestructure between the two phases. Exchange spring MnBi-Fe$_x$Co$_{1-x}$ (x =0.65 and 0.35) bilayers with various thicknesses of the soft magnetic layerwere deposited onto quartz glass substrates in a DC magnetron sputtering unitfrom alloy targets. Magnetic measurements and density functional theory (DFT)calculations reveal that a Co-rich FeCo layer leads to more coherent exchangecoupling. The optimum soft layer thickness is about 1 nm. In order to take intoaccount the effect of incoherent interfaces with finite roughness, we havecombined a cross-sectional High Resolution Transmission Electron Microscopy(HR-TEM) analysis with DFT calculations and micromagnetic simulations. Theexperimental results can be consistently described by modeling assuming apolycrystalline FeCo layer consisting of crystalline (110) and amorphous grainsas confirmed by HR-TEM. The micromagnetic simulations show in general how thethickness of the FeCo layer and the interface roughness between the hard andsoft magnetic phases both control the effectiveness of exchange coupling in anexchange spring system.

On the origin of incoherent magnetic exchange coupling in MnBi/Fe$_x$Co$_{1-x}$ bilayer system