Symmetry breaking of magnetic vortices before annihilation (APL Cover)

In this work we created two unique energy landscapes by applying a magnetic force field parallel and anti-parallel to to the vortex polarity. This lead to the breakdown of the rotational symmetry of the vortex state into unique asymmetric identities.

Pulecio, J. F., Pollard, S. D., Warnicke, P., Arena, D. A., & Zhu, Y. (2014, September 29). Symmetry breaking of magnetic vortices before annihilation. Applied Physics Letters. AIP Publishing. doi:10.1063/1.4893422

Coherence and modality of driven interlayer-coupled magnetic vortices - Nature Communications

In this work we directly observed the effects of fundamental magnetic interactions between two driven magnetic vortices. See the press release below for a more general explanation. The figure on above is the magnetic signal of two vortex cores (radius ~10nm) reconstructed from an experimental Lorentz image of a multilayered nano-disc during a quasi-static magnetic field sweep. 

Pulecio, J. F., Warnicke, P., Pollard, S. D., Arena, D. A., & Zhu, Y. (2014). Coherence and modality of driven interlayer-coupled magnetic vortices. Nature Communications, 5, 3760. doi:10.1038/ncomms4760

Press Release: http://www.bnl.gov/newsroom/news.php?a=11635

Book Chapter: Parallel Energy Minimizing Computation via Dipolar Coupled Single Domain Nanomagnets

Pulecio, J. F., Bhanja, S., & Sarkar, S. (2013). Parallel Energy Minimizing Computation via Dipolar Coupled Single Domain Nanomagnets. In J. E. Morris & K. Iniewski (Eds.), Nanoelectronic Device Applications Handbook (p. 940). CRC Press. Retrieved from http://www.crcpress.com/product/isbn/9781466565234