Three-dimensional tomographic imaging of the magnetization vector field using Fourier transform holography

The authors present a new tomographic technique, based on Fourier transform holography. It is a lensless imaging technique to retrieve the object of interest from its diffraction pattern in a single step of computation. A combination of dual-axis tomographic projections provides a 3D vectorial magnetic image of an 800-$n\phantom{\rule{0}{0ex}}m$-thick Fe/Gd multilayer in a 5-$\ensuremath{\mu}\phantom{\rule{0}{0ex}}m$-diameter field of view with a resolution of 80 $n\phantom{\rule{0}{0ex}}m$. The reconstruction reveals not only wormlike domains with magnetization pointing mostly out of plane, but also the subtle features of magnetic flux closure around the domain walls.