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Title: Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [2];  [9]
  1. Univ. of California, Santa Cruz, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of Hamburg (Germany)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. ETH Zurich (Switzerland). Lab. for Mesoscopic Systems, Dept. of Materials; Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  6. Univ. of Hamburg (Germany)
  7. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  8. Harbin Inst. of Technology (China)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS) ; Aalto Univ., Otaniemi (Finland). School of Science; Paul Scherrer Inst. (PSI), Villigen (Switzerland)
+ Show Author Affiliations

We explore the thermodynamics in two-dimensional arrays consisting of Ising-type nanomagnets lithographically arranged onto random sites and angular orientations. Introducing these basic spin-glass ingredients, we study the characteristic features of the low-energy states achieved, following thermal-annealing protocols. From direct visualization of real-time dynamics, we record relaxation timescales together with magnetic susceptibility variations over temperature, revealing trends towards short-range order as randomness is increased, but falling short of pure spin-glass behavior. Our work provides a route towards the realization of artificial Ising spin-glass systems.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1594920
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Advances in artificial spin ice journal November 2019
Elevated effective dimension in tree-like nanomagnetic Cayley structures journal January 2020
Dipolar Cairo lattice: Geometrical frustration and short-range correlations journal October 2019

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36 MATERIALS SCIENCE
Antiferromagnetism
Ferromagnetism
Frustrated magnetism
Magnetic nanoparticles
Nanostructures
Photoelectron emission microscopy
Spin glasses
Spin ice
Spin texture
X-ray magnetic circular dichroism