Optical trapping allows the trapping and manipulation
of dielectric
microparticles. However, full control over all six degrees of freedom
of the trapped object is challenging. Here, we use ferromagnetic iron-doped
upconversion microparticles for simultaneous optical trapping and
magnetic micromanipulation that allows full control over all translational
and rotational degrees of freedom. These microparticles have a low
absorption that allows optical trapping and a high coercivity and
saturation magnetization that allow magnetic manipulation. The particles
will enable micromanipulation experiments, for example, in single-molecule
biophysics.
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