Field-induced phase coexistence in an artificial spin ice
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States); Yale Univ., New Haven, CT (United States)
Artificial spin-ice systems are magnetic metamaterials consisting of nanomagnet arrays that can be designed to study exotic magnetic states not found in natural materials. Typically, these arrays are modelled as interacting binary macrospins that can only be in an up or down state and are described by the Ising model. These materials have demonstrated ordering transitions, but only via a spontaneous symmetry-breaking mechanism. In this study, we have designed and studied a quadrupole artificial spin-ice system consisting of interacting plaquettes of coupled single-domain nanomagnets that can be interpreted as a composite, ternary variable. After annealing this system in an external magnetic field, we observe both a ferroquadrupolar and an antiferroquadrupolar phase, with an apparent first-order phase boundary and a coexistence regime. The phase diagram of this material is reminiscent of a model used to describe phase coexistence in the superfluid transition of 4He with 3He impurities. Finally, these results illustrate how composite magnetic objects realize exotic statistical physics models beyond the Ising model.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- 89233218CNA000001; AC52-06NA25396; SC0010778
- OSTI ID:
- 1570636
- Alternate ID(s):
- OSTI ID: 1594856
- Report Number(s):
- LA-UR-18-29639
- Journal Information:
- Nature Physics, Vol. 15, Issue 2; ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Advances in artificial spin ice
|
journal | November 2019 |
Elevated effective dimension in tree-like nanomagnetic Cayley structures
|
journal | January 2020 |
Understanding thermal annealing of artificial spin ice
|
journal | November 2019 |
Magnetization dynamics in artificial spin ice
|
journal | October 2019 |
Dipolar Cairo lattice: Geometrical frustration and short-range correlations
|
journal | October 2019 |
Understanding Thermal Annealing of Artificial Spin Ice | text | January 2019 |
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