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Title: Spatial and Temporal Correlations of XY Macro Spins

Abstract

We use nano disk arrays with square and honeycomb symmetry to investigate magnetic phases and spin correlations of XY dipolar systems at the micro scale. Utilizing magnetization sensitive X-ray photoemission electron microscopy, we probe magnetic ground states and the "order-by-disorder" phenomenon predicted 30 years ago. We observe the antiferromagnetic striped ground state in square lattices, and 6-fold symmetric structures, including trigonal vortex lattices and disordered floating vortices, in the honeycomb lattice. The spin frustration in the honeycomb lattice causes a phase transition from a long-range ordered locked phase over a floating phase with quasi long-range order and indications of a Berezinskii-Thouless-Kosterlitz-like character, to the thermally excited paramagnetic state. Absent spatial correlation and quasi periodic switching of isolated vortices in the quasi long-range ordered phase suggest a degeneracy of the vortex circulation.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Santa Cruz, CA (United States). Dept. of Physics
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Univ. of Oregon, Eugene, OR (United States). Dept. of Physics
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). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1473704
Alternate Identifier(s):
OSTI ID: 1530322
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 12; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Macro spins; nano disk array; phase transition; spin correlation; X-ray photoemission electron microscopy; XY dipolar systems

Citation Formats

Streubel, Robert, Kent, Noah, Dhuey, Scott, Scholl, Andreas, Kevan, Steve, and Fischer, Peter. Spatial and Temporal Correlations of XY Macro Spins. United States: N. p., 2018. Web. https://doi.org/10.1021/acs.nanolett.8b01789.
Streubel, Robert, Kent, Noah, Dhuey, Scott, Scholl, Andreas, Kevan, Steve, & Fischer, Peter. Spatial and Temporal Correlations of XY Macro Spins. United States. https://doi.org/10.1021/acs.nanolett.8b01789
Streubel, Robert, Kent, Noah, Dhuey, Scott, Scholl, Andreas, Kevan, Steve, and Fischer, Peter. Mon . "Spatial and Temporal Correlations of XY Macro Spins". United States. https://doi.org/10.1021/acs.nanolett.8b01789. https://www.osti.gov/servlets/purl/1473704.
@article{osti_1473704,
title = {Spatial and Temporal Correlations of XY Macro Spins},
author = {Streubel, Robert and Kent, Noah and Dhuey, Scott and Scholl, Andreas and Kevan, Steve and Fischer, Peter},
abstractNote = {We use nano disk arrays with square and honeycomb symmetry to investigate magnetic phases and spin correlations of XY dipolar systems at the micro scale. Utilizing magnetization sensitive X-ray photoemission electron microscopy, we probe magnetic ground states and the "order-by-disorder" phenomenon predicted 30 years ago. We observe the antiferromagnetic striped ground state in square lattices, and 6-fold symmetric structures, including trigonal vortex lattices and disordered floating vortices, in the honeycomb lattice. The spin frustration in the honeycomb lattice causes a phase transition from a long-range ordered locked phase over a floating phase with quasi long-range order and indications of a Berezinskii-Thouless-Kosterlitz-like character, to the thermally excited paramagnetic state. Absent spatial correlation and quasi periodic switching of isolated vortices in the quasi long-range ordered phase suggest a degeneracy of the vortex circulation.},
doi = {10.1021/acs.nanolett.8b01789},
journal = {Nano Letters},
number = 12,
volume = 18,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 5 works
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Figures / Tables:

Figure 1 Figure 1: Nano disk arrays resembling XY macro spins. (a),(b) SEM (inlens) micrographs of square and honeycomb lattice. (c) TEM image revealing high-quality nano disks with traces of polymeric residuals. (d) Schematics of (c) indicating used notation. Scale bars are 200 nm.

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    Works referencing / citing this record:

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.