Grande conférence iLM

Vendredi 18 Novembre 2011 à 14h00.

Ground state search in artificial spin-ice

Paolo POLITI
(Institute for Complex Systems, Florence)



Invité(e) par
O. Pierre-Louis

présentera en 2 heures :

''Artificial spin-ices are two dimensional arrays of single-domain, Ising type magnetic dots, whose size is too large to undergo thermal fluctuations. Therefore, they are strongly out-of-equilibrium systems whose dynamics are due to the driving magnetic field and to magnetostatic interactions among dots. Square spin-ices have a well defined ground state, in spite of frustration. Much work is addressed to understand how the system can be driven towards the ground state and how dynamics proceeds under the application of a magnetic field. We give some preliminary answers, giving a description of dynamics in terms of vertex configurations [1] and highlighting the importance of disorder and randomness [2]: quenched disorder in the system and randomness in the time dependence of the driving field. In collaboration with Zoe Budrikis and Robert L. Stamps (University of Western Australia and University of Glasgow). [1] Phys. Rev. Lett. 105, 107201 (2010). [2] Phys. Rev. Lett. (in press). arXiv:1110.1463''