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Title: Dipolar Cairo lattice: Geometrical frustration and short-range correlations

Journal Article · · Physical Review Materials
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [6]; ORCiD logo [7]; ORCiD logo [8]
  1. Univ. of California, Santa Cruz, CA (United States). Physics Dept.
  2. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland). Dept. of Materials, Lab. for Mesoscopic Systems
  3. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  5. Harbin Institute of Technology, Shenzhen, Guangdong (China). School of Materials Science and Engineering
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. Aalto Univ. School of Science (Finland). Dept. of Applied Physics, NanoSpin
  8. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Laboratory for Multiscale Materials Experiments; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Aalto Univ. School of Science (Finland). Dept. of Applied Physics, NanoSpin

We have studied low-energy configurations in two-dimensional arrays consisting of Ising-type dipolar coupled nanomagnets lithographically defined onto a two-dimensional Cairo lattice, thus dubbed the dipolar Cairo lattice. Employing synchrotron-based photoemission electron microscopy (PEEM), we perform real-space imaging of moment configurations achieved after thermal annealing. These states are then characterized in terms of vertex populations, spin- and emergent magnetic charge correlations, and a topology-enforced emergent ice rule. The results reveal a strong dominance of short-range correlations and the absence of long-range order, reflecting the high degree of geometrical spin frustration present in this example of an artificial frustrated spin system.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1779228
Journal Information:
Physical Review Materials, Vol. 3, Issue 10; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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