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Frustration by Design in Artificial Spin Ice

Thursday November 3, 2016
11:00 am


 Presenter:  Dr. Cristiano Nisoli, Los Alamos National Lab
 Series:  OSE Seminars
 Abstract:  Frustration, the presence of constraints/interactions that cannot be completely satisfied, often provides a mechanism for degeneracy and disorder, giving rise to lively manifold and phases of exotic behaviors. In the past few years a new perspective has opened in the study of such states via artificial frustrated magnetic systems [1,7] via arrays of lithographically fabricated single-domain ferromagnetic nanostructures whose magnetic textures behave like macro-spins. While their collective dynamics is controlled by their mutual geometric arrangement, which is open to design, they can furthermore be characterized, at the magnetic degree of freedom level, in real-space, and recently also in real-time, for unprecedented vistas of statistical mechanics in action. In this talk, after an overview on the state of this field we inform on recent new directions. Higher control, inclusive of genuine thermal ensembles [8,9] have replaced the earlier and coarser methods based on magnetic agitation [2,6]. Dynamical versions are now being realized [10,12], characterized in real time via PEEM. This has lead to the implementation of new, dedicated topologies [13, 14], not found in nature, for bottom up design of desired emergent properties [15, 16] and exotic phases, which appear now at reach to the experimental search [12]. Born as a scientific toy to investigate frustration-by-design, artificial spin ice might now be opening "a path into an uncharted territory, a landscape of advanced functional materials in which topological effects on physical properties can be explored and
harnessed." [17]

[1] R. F. Wang et al., Nature 439, 303-306 (2006)
[2] C. Nisoli et al., Rev. Mod. Phys. 85 (4), 1473 (2013)
[3] S. Ladak, et al, Nature Physics 6, 359 (2010)
[4] P. E. Lammert, et al, Nature Physics 6, 786-789 (2010)
[5] E. Mengotti et al. Nature Physics, 7 68 (2011)
[6] C. Nisoli et al. Phys. Rev. Lett. 105, 047205 (2010)
[7] W. R. Branford et al. Science 335 1597 (2012)
[8] Z. Sheng et al. Nature 500 (7464), 553 (2013)
[9] Porro, J. M., et al. New Journal of Physics 15.5 055012 (2013)
[10] A. Farhan et al. Nature Physics 9, 375-382(2013)
[11] V. Kalpaklis et al. Nature Nanotechnology 9, 514 (2014)
[12] L Anghinolfi et al., Nature Communications 6, 8278 (2015)
[13] M. Morrison et al. New Journal of Physics 15 (4), 045009 (2013)
[14] G-W Chern et al Phys. Rev. Lett. 111 (17), 177201 (2013)
[15] I. Gilbert et al., Nature Physics, 10 (9), 670-675 (2014)
[16] I. Gilbert et Al., Nature Physics 12, 162-165 (2016)
[17] R. L. Stamps, News and Views, Nature Physics 10, 623-624 (2014)
 Location:  Room 103, Center for High Tech Materials

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