Category Archives: NEWS

Magnetic domain wall creep and depinning: a scalar field model approach

Our new preprint on magnetic domain wall creep and depinning is available online!!!

Researcher position

I have started a new fresh year in a new office and a new desk, this time as an stable researcher of CONICET (the Argentinean National Research Council). I’m joining a group of excellent people, the condensed matter theory group, at Centro Atómico Bariloche (Argentina), a great spot to do science. I’m grateful to the group for the welcoming and to all my previous hosts for a very soft and enriching postdoc path to my actual position. Thanks!

Centro Atómico Bariloche (some time ago)

Third workshop of CC&B – 9 Oct Milano

Happy to be part of the third workshop of the Center for Complexity & Biosystems, University of Milan, with a broad interdisciplinary scope.

Review article: Deformation and flow of amorphous solids: a review of mesoscale elastoplastic models

It has been a very long work, beautifully leaded by Alexandre the great, but finally it’s out there: the preprint of our review article on elastoplastic models for the deformation of amorphous solids. Since we begin a long edition path now, any comments and suggestions would be welcome! Enjoy! (arxiv:1708.09194)

Coming back from Advances in Complex Systems (Lake Como School of Advanced Studies)

Last week has been full of nice discoveries at LCSAS . Physics has still a lot to say about biological systems. Thanks to Stefano Zapperi, Caterina La Porta and Mikko Alava for bringing together some great speakers and given us the opportunity to participate.


Our article “Spatiotemporal patterns in ultraslow domain wall creep dynamics” published in PRL

(edited) Our article is now available online in Phys. Rev. Lett. !

In presence of impurities, ferromagnetic and ferroelectric domain walls slide only above a finite external field. Close to this depinning threshold, they proceed by large and abrupt jumps, called avalanches, while, at much smaller field, these interfaces creep by thermal activation. In this work we develop a novel numerical technique that captures the ultra-slow creep regime over huge time scales. We point out the existence of activated events that involve collective reorganizations similar to avalanches, but, at variance with them, display correlated spatio-temporal patterns that resemble the complex sequence of aftershocks observed after a large earthquake. Remarkably, we show that events assembly in independent clusters that display at large scales the same statistics as critical depinning avalanches. We foresee this correlated dynamics being experimentally accessible by magneto-optical imaging of ferromagnetic films.

My visit to Aalto University (Finland)

I have visited the CSM group at Aalto University in Helsinki, and attended the International Workshop on Machine Learning for Materials Science that was organized there. Many thanks to Lasse Laurson and Mikko Alava for their kind hospitality!

I’m now a member of the Network of Argentinean Researchers in Italy (RCAI)

Take a look!!


About the network:

Our article “Inertia and universality of avalanche statistics: The case of slowly deformed amorphous solids” accepted for publication in PRE.

In this paper, with Kamran Karimi and Jean-Louis Barrat, we solve numerically the dynamics of an amorphous solid under deformation in the quasistatic driving limit, by means of a finite elements technique. We study the noise statistics of the stress-strain signal in the steady state plastic flow, focusing on systems with low internal dissipation. We analyze the distributions of avalanche sizes and durations and the density of shear transformations when varying the damping strength. In contrast to avalanches in the overdamped case, dominated by the yielding point universal exponents, inertial avalanches are controlled by a non-universal damping dependent feedback mechanism; eventually turning negligible the role of correlations. Still, some general properties of avalanches persist and new scaling relations can be proposed.

It will be available soon in PRE.

I have participated at MMM-Dijon

Few weeks ago I had the pleasure to participate at the 8th Multiscale Materials Modeling (MMM) international conference in Dijon, France, where I presented our work on the avalanche statistics near the yielding transition. It was a week full of interesting discussions and new motivating ideas. Thanks to the symposium D organizers for the opportunity.