Thermodynamics of emergent magnetic charge screening in artificial spin ice
| Autor: | Charlotte F. Petersen, Clemens Wuth, Rajesh V. Chopdekar, Paula Mellado, Scott Dhuey, Luca Anghinolfi, Alan Farhan, Andreas Scholl, Mikko J. Alava, Sebastiaan van Dijken |
|---|---|
| Přispěvatelé: | Department of Applied Physics, Lawrence Berkeley National Laboratory, University of Genoa, Daegu Gyeongbuk Institute of Science and Technology, University of California Davis, Universidad Adolfo Ibáñez, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Multidisciplinary Condensed matter physics ta114 Science Magnetic monopole General Physics and Astronomy 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Polaron 01 natural sciences Electric charge Article General Biochemistry Genetics and Molecular Biology Spin ice Dipole Affordable and Clean Energy Ferromagnetism 0103 physical sciences Coulomb 010306 general physics 0210 nano-technology Ground state |
| Zdroj: | Nature Communications Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016) Farhan, A; Scholl, A; Petersen, CF; Anghinolfi, L; Wuth, C; Dhuey, S; et al.(2016). Thermodynamics of emergent magnetic charge screening in artificial spin ice. Nature Communications, 7. doi: 10.1038/ncomms12635. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/9h4745wg Nature communications, vol 7, iss 1 |
| Popis: | Electric charge screening is a fundamental principle governing the behaviour in a variety of systems in nature. Through reconfiguration of the local environment, the Coulomb attraction between electric charges is decreased, leading, for example, to the creation of polaron states in solids or hydration shells around proteins in water. Here, we directly visualize the real-time creation and decay of screened magnetic charge configurations in a two-dimensional artificial spin ice system, the dipolar dice lattice. By comparing the temperature dependent occurrence of screened and unscreened emergent magnetic charge defects, we determine that screened magnetic charges are indeed a result of local energy reduction and appear as a transient minimum energy state before the system relaxes towards the predicted ground state. These results highlight the important role of emergent magnetic charges in artificial spin ice, giving rise to screened charge excitations and the emergence of exotic low-temperature configurations. Inspired by the physics of bulk frustrated materials, arrays of coupled nanomagnets have been widely explored for the study of collective ordering and emergent behaviour. Here, the authors demonstrate interaction-driven charge screening in a thermally active artificial spin ice lattice. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|