Prof. Stéphane Mangin, Institut Jean Lamour,CNRS- Nancy-Université (France)
The purpose of this lecture is to give an introduction to nanomagnetism and spintronic. I will highlight the characteristics lengths, times and energies that are involved for both topics. The origin of magnetization will be discussed. A review of the magnetic quantities that characterize magnetic materials (Magnetization, Zeeman, energy, exchange energy, magnetic anisotropy energy and dipolar energy) will be given. I will present how their values and the competitions between those quantities affect magnetic configurations in nano-object. Magnetization reversal processes will be discussed. I will focus on coherent magnetization reversal i.e. the Stoner-Wohlfart model. In a second part I will present a short overview of spintronic. Concept such as electron mean free path, spin diffusion length and spin accumulation will be given. Then using the above description I will introduce spin transfer torque. Finally I will present some applications involving nanomagnetism and spintronic.
