Figure 1.

a SEM, and b TEM micrographs of the magnetic nanospheres; nanomagnets are not visible through the polymer layer in SEM images, while the TEM micrograph (90 kV) captures the polymer encapsulation and the embedded nanoparticles simultaneously

Ghosh et al. Nanoscale Research Letters 2009 5:195-204   doi:10.1007/s11671-009-9465-9