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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1594920
Alternate Identifier(s):
OSTI ID: 1524114
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Antiferromagnetism; Ferromagnetism; Frustrated magnetism; Spin texture; Magnetic nanoparticles; Nanostructures; Spin glasses; Spin ice; Photoelectron emission microscopy; X-ray magnetic circular dichroism

Citation Formats

Saccone, Michael, Scholl, Andreas, Velten, Sven, Dhuey, Scott, Hofhuis, Kevin, Wuth, Clemens, Huang, Yen-Lin, Chen, Zuhuang, Chopdekar, Rajesh V., and Farhan, Alan. Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.224403.
Saccone, Michael, Scholl, Andreas, Velten, Sven, Dhuey, Scott, Hofhuis, Kevin, Wuth, Clemens, Huang, Yen-Lin, Chen, Zuhuang, Chopdekar, Rajesh V., & Farhan, Alan. Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets. United States. doi:10.1103/physrevb.99.224403.
Saccone, Michael, Scholl, Andreas, Velten, Sven, Dhuey, Scott, Hofhuis, Kevin, Wuth, Clemens, Huang, Yen-Lin, Chen, Zuhuang, Chopdekar, Rajesh V., and Farhan, Alan. Mon . "Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets". United States. doi:10.1103/physrevb.99.224403.
@article{osti_1594920,
title = {Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets},
author = {Saccone, Michael and Scholl, Andreas and Velten, Sven and Dhuey, Scott and Hofhuis, Kevin and Wuth, Clemens and Huang, Yen-Lin and Chen, Zuhuang and Chopdekar, Rajesh V. and Farhan, Alan},
abstractNote = {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.},
doi = {10.1103/physrevb.99.224403},
journal = {Physical Review B},
number = 22,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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