1 research outputs found
Nanoscale Mapping of the Magnetic Properties of (111)-Oriented La<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub>
Spatially
resolved analysis of magnetic properties on the nanoscale remains
challenging, yet strain and defects on this length-scale can profoundly
affect a material’s bulk performance. We present a detailed
investigation of the magnetic properties of La<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> thin films in both free-standing and nanowire
form and assess the role of strain and local defects in modifying
the films’ magnetic properties. Lorentz transmission electron
microscopy is used to measure the magnetocrystalline anisotropy and
to map the Curie temperature and saturation magnetization with nanometric
spatial resolution. Atomic-scale defects are identified as pinning
sites for magnetic domain wall propagation. Measurement of domain
wall widths and crystalline strain are used to identify a strong magnetoelastic
contribution to the magnetic anisotropy. Together, these results provide
unique insight into the relationship between the nanostructure and
magnetic functionality of a ferromagnetic complex oxide film