Simultaneous mapping of magnetic and atomic structure for direct visualization of nanoscale magnetoelastic coupling
arxiv(2024)
摘要
Achieving a correlative measurement of both magnetic and atomic structures at
the nanoscale is imperative to understand the fundamental magnetism of matters
and for fostering the development of new magnetic nanomaterials. Conventional
microscopy methods fall short in providing the two information simultaneously.
Here, we develop a new approach to simultaneously map the magnetic field and
atomic structure at the nanoscale using Lorentz 4-dimensional scanning
transmission electron microscopy (Ltz-4D-STEM). This method enables precise
measurement of the characteristic atomic and magnetic structures across an
extensive field of view, a critical aspect for investigating real-world
ferromagnetic materials. It offers a comprehensive visualization and
statistical evaluation of the different structural information at a
pixel-by-pixel correlation. The new method allows to directly visualize the
magnetoelastic coupling and the resulting complex magnetization arrangement as
well as the competition between magnetoelastic and magnetostatic energy. This
approach opens new avenues for in-depth studying the structure-property
correlation of nanoscale magnetic materials.
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