Electron-Waves and Spin-Texture in Nanomagnets Dragomir Davidovic School of Physics Georgia Tech We present measurements of electron-interference effects on resistance of Cobalt nanoparticles at low temperatures. We study how electron-phases respond to different magnetization reversal processes. The experimental technique involves tracing of differential resistance peaks as a function of the applied magnetic field and the bias voltage. Significant phase-shifts are generated when domains are nucleated or annihilated. We explain how these phase-shifts arise from the Berry phase. We show that the electron-phase provides information not accessible by the classical magnetoresistance in ferromagnets.