We demonstrate a fabrication technique to create cylindrical NiFe magnetic nanoparticles (MNPs) with controlled dimensions and composition. MNPs thicker than 200 nm can form a double vortex configuration, which consists of a pair of vortices with opposite chirality. When MNPs thicker than 300 nm are relaxed after saturation, it forms a frustrated triple vortex state which produces a higher net magnetization as verified by light transmissivity measurements. Therefore, a greater magnetic torque can be actuated on a MNP in the triple vortex state. © 2014 AIP Publishing LLC.

Chandrasekhar Murapaka

Department of Materials Science and Metallurgical Engineering

Gan W.L.

Wong D.W.

Purnama I.

Chiam S.Y.

Wong L.M.

Lew W.S.

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Applied Physics Letters

Multi-vortex states in magnetic nanoparticles

Journal	Data powered by TypesetApplied Physics Letters
Publisher	Data powered by TypesetAmerican Institute of Physics Inc.
ISSN	00036951
Open Access	No