|
Content:
|
The study of emergent phenomena in two-dimensional artificial spin ices is presently the focus of intense research. Artificial spin ices are composed of geometrically frustrated arrangements of nanomagnets and have so far mainly been used to investigate fundamental aspects of the physics of frustration. Recently, it has become clear that artificial spin ices have the potential to become a class of functional materials with technological applications. In this context, I will present examples, which illustrate three promising directions of research. The first is the creation of an active material based on a spin ice consisting of a repeating pattern of chiral units. In this system, energy is converted into unidirectional dynamics, thus functioning like a ratchet [1]. The second consists in exploiting spin ices for spin wave manipulation [2,3] with the aim of creating reconfigurable magnonic crystals [4]. Finally, I will present the possibility of extending the study of artificial spin systems to three dimensions. Recent advances in synchrotron-based imaging methods [5,6] as well as in scanning probe microscopy [7] are expected to enable further significant advances in this field.
[1] S. Gliga, G. Hrkac, C. Donnelly, J. Büchi, A. Kleibert, J. Cui, A. Farhan, E. Kirk, R. V. Chopdekar, Y. Masaki, N. S. Bingham, A. Scholl, R. L. Stamps, L. J. Heyderman, Nat. Mater. 16, 1106 (2017)
[2] S. Gliga, A. Kákay, R. Hertel, O. G. Heinonen, PRL 110, 117205 (2013)
[3] E. Iacocca, S. Gliga, O. G. Heinonen, arxiv.org/abs/1911.05354 (2019)
[4] S. Gliga, E. Iacocca, O. G. Heinonen, arxiv.org/abs/1912.07280 (2019)
[5] C. Donnelly, M. Guizar-Sicairos, V. Scagnoli, S. Gliga, M. Holler, J. Raabe, L. J. Heyderman, Nature 547, 328 (2017)
[6] C. Donnelly, S. Finizio, S. Gliga, M. Holler, A. Hrabec, M. Odstrcil, S. Mayr, V. Scagnoli, L. J. Heyderman, M. Guizar-Sicairos, J. Raabe, Nat. Nanotechnol. (2020)
[7] M. Wyss, S. Gliga, D. Vasyukov, L. Ceccarelli, G. Romagnoli, J. Cui, A. Kleibert, R. L. Stamps, M. Poggio, ACS Nano 13, 13910 (2019)
|
