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Séminaire NANO

Mardi 7 octobre 2014 à 9h30,
Salle Remy Lemaire, K223

Orateur : Nicolas Rougemaille (MNM)
"Magnetically frustrated nanostructure arrays : what for ?"


Frustration is a general concept in physics and can be found in many condensed matter systems. Frustration arises when all pairwise interactions can not be satisfied simultaneously, for example due to the system geometry. In some cases, frustration leads to an extensively degenerate ground state, i.e a low-temperature manifold built with a large number of configurations with identical energy. Frustrated systems may thus have a finite entropy, even at zero temperature, thus (apparently) violating the third law of thermodynamics.

Arrays of magnetic nanostructures can be useful to study frustration effects and several groups worldwide are currently investigating the magnetic behavior of two-dimensional frustrated arrays of nanomagnets. These artificial spin systems offer the opportunity to change at will the geometry and properties of the array, allowing the exploration of intriguing phenomena and the visualization, in real space, of unconventional magnetic phases. Part of the work we are doing in this field will be presented in this seminar.

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