Magnetic Vortex Nanorings: application to hysperthermia and simulations

Some recent articles related to the proposal of using Fe oxide nanorings for magnetic hyperthermia.

1) Magnetic Vortex Nanorings: A New Class of Hyperthermia Agent for Highly Efficient In Vivo Regression of Tumors.
Xiao Li Liu, Yong Yang, Cheng Teng Ng, Ling Yun Zhao, Ying Zhang, Boon Huat Bay, Hai Ming Fan, and Jun Ding
Advanced materials 27, 1939 (2015)

The unique magnetic vortex structure allows ferrimagnetic vortex-domain iron oxide nanorings to possess negligible remanence and large hysteresis loss, which not only promotes colloid stability but also maximizes the specific absorption rate. It overcomes the super-paramagnetic limitation and allows a new class of nanoparticle agent to be designed for high-performance thermal-based biomedical applications.

2) Innovative magnetic nanoparticle platform for magnetic resonance imaging and magnetic fluid hyperthermia applications
Xiao Li Liu, Hai Ming Fan
Current Opinion in Chemical Engineering 4, 38 (2014)

Illustration of representative NP agent comprised of magnetic core and shell coating for biorelated applications.

3) Stable vortex magnetite nanorings colloid: Micromagnetic simulation and experimental demonstration.
Yong Yang, Xiao-Li Liu, Jia-bao Yi, Yang Yang, Hai-Ming Fan, and Jun Ding
J. Appl. Phys. 111, 044303 (2012)

(a)-(c) The simulated ground states (F_out, vortex, and onion, respectively) of magnetite nanorings with different geometry. (d) Ground state phase diagram of magnetite nanorings as a function of T and D_out with β = 0.8 (black triangles), 0.6 (red squares), and 0.4 (blue circles). Solid symbols show the boundaries between the vortex, F_out (out-of-plane ferromagnetic) and F_in (in-plane ferromagnetic) configurations.