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A micro-robot is a promising device for minimally invasive surgery or drug delivery inside of the body for medical purpose. Due to its small size, the micro robot should float in the blood vessel to destination. Therefore, the propulsion mechanism of micro-robot have become an active area of study these days [1][2]. Recent studies of the propulsion of these robots have focused on the insertion of...
Radial forces due to rotor eccentricity (or unbalanced magnetic pull) are a common source of noise and vibration in a permanent-magnet synchronous motor [1]. Previous works on radial forces due to eccentricity use an approach of harmonic superposition [2] or the assumption of linear variation in magnetic fields according to eccentricity [3]. In this paper, we use a perturbation theory to find a closed-form...
For next-generation memory and logic devices, there have been suggested many concepts of the unidirectional coherent motion of magnetic domain walls (DWs) [1-3]. Such motion occurs either by injecting large electric currents into nanowires [1] or by employing DW tension induced by sophisticated structural modulation [2, 3]. These schemes, however, require either a high threshold [1] or highly sophisticated...
Investigation of magnetic domain wall (DW) motion and spin wave (SW) propagation in ferromagnetic nanowires has garnered attention due to the potential applications in future information communication. Particular in patterned ferromagnetic nanowires, the DW and SW propagation are controllable by geometrical modulation generally use notches or artificial imperfections extensively. Recently, diode-like...
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