Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Focus Session: Magnetic Correlations in Mesoscopic Spin Structures

MA 32.5: Hauptvortrag

Mittwoch, 22. März 2017, 11:45–12:15, HSZ 01

Artificial magnets as model systems : from the fragmentation of magnetization to the seminal square ice model — •Benjamin Canals, Yann Perrin, Ioan Chioar, and Nicolas Rougemaille — Institut NEEL, Grenoble, France

Complex architectures of nanostructures are routinely elaborated using bottom-up or nanofabrication processes, allowing scientists to engineer frustrated arrays that do not exist in nature. These systems have been the subject of intense research in the last few years and have allowed the investigation of fascinating phenomena, such as the observation of pseudo-excitations involving classical analogues of magnetic charges. This talk aims at providing two examples of two-dimensional artificial magnets which allow to probe the low energy manifolds of two exotic Ising systems.

The first one is related to the seminal square ice model and shows that it is possible to perform a scan through the 6-vertex model phase diagram with an appropriately designed artificial magnet [1]. The second one refers to a recent proposal, the fragmentation of magnetization [2], in an Ising kagome model, which corresponds to the effective splitting of the local degree of freedom into two channels independent channels [3].

[1] Y. Perrin, B. Canals, N. Rougemaille, Nature 540, 410-413 (2016). [2] M. E. Brooks-Bartlett et al., Phys. Rev. X, 4, 011007 (2014). [3] B. Canals et al., Nat. Comm. 7, 11446 (2016).