Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y24: Artificial Frustrated Spin Systems
11:15 AM–1:51 PM,
Friday, March 9, 2018
LACC Room: 403A
Sponsoring Units: GMAG DMP
Chair: Oleg Tchernyshyov, Johns Hopkins Univ
Abstract: Y24.00001 : Fragmentation of magnetism in artificial kagome spin ice
11:15 AM–11:27 AM
Artificial spin ices (ASI) are systems designed to explore the intriguing physics observed in magnetically frustrated materials. Generally fabricated by using lithography techniques, they offer almost infinite possibilities to construct a wide variety of spin models which can be accessed experimentally in a controlled manner.
Here, we investigate magnetic frustration effects in a thermally active kagome ASI. The magnetic configurations we image reveal the fingerprints of a spin fragmentation process. This process, predicted theoretically, corresponds to a splitting of the spin degree of freedom into two independent sectors . In some cases, one given classical spin can belong simultaneously to an ordered magnetic configuration and to a highly disordered one. In our experiment, the first sector is identified as an incipient antiferromagnetic crystal of an all-in/all-out spin configuration, in which spins carry 1/3 of their total magnetic moment, while the second sector corresponds to a diffuse organization of the remaining fragmented spins carrying 2/3 and 4/3 magnetic moments. We thus provide the first experimental evidence of spin fragmentation in ASI .
 M. E. Brooks-Bartlett et al., Phys. Rev. X 4, 011007 (2014).
 B. Canals et al., Nat. Commun. 7, 11446 (2016).
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700