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Title: Nanostructured complex oxides as a route towards thermal behavior in artificial spin ice systems

Abstract

Here, we have used soft x-ray photoemission electron microscopy to image the magnetization of single-domain La 0.7Sr 0.3MnO 3 nanoislands arranged in geometrically frustrated configurations such as square ice and kagome ice geometries. Upon thermal randomization, ensembles of nanoislands with strong interisland magnetic coupling relax towards low-energy configurations. Statistical analysis shows that the likelihood of ensembles falling into low-energy configurations depends strongly on the annealing temperature. Annealing to just below the Curie temperature of the ferromagnetic film (T C = 338 K) allows for a much greater probability of achieving low-energy configurations as compared to annealing above the Curie temperature. At this thermally active temperature of 325 K, the ensemble of ferromagnetic nanoislands explore their energy landscape over time and eventually transition to lower energy states as compared to the frozen-in configurations obtained upon cooling from above the Curie temperature. Thus, this materials system allows for a facile method to systematically study thermal evolution of artificial spin ice arrays of nanoislands at temperatures modestly above room temperature.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2]; ORCiD logo [2];  [3];  [3];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1394557
DOE Contract Number:  
AC05-00OR22725; AC02-05CH11231; DMR 1411250
Resource Type:
Journal Article
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 2; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chopdekar, Rajesh V., Li, Binzhi, Wynn, Thomas A., Lee, Michael S., Jia, Y., Liu, Zhiqi, Biegalski, Michael D., Retterer, Scott T., Young, Anthony T., Scholl, Andreas, and Takamura, Y. Nanostructured complex oxides as a route towards thermal behavior in artificial spin ice systems. United States: N. p., 2017. Web. doi:10.1103/PhysRevMaterials.1.024401.
Chopdekar, Rajesh V., Li, Binzhi, Wynn, Thomas A., Lee, Michael S., Jia, Y., Liu, Zhiqi, Biegalski, Michael D., Retterer, Scott T., Young, Anthony T., Scholl, Andreas, & Takamura, Y. Nanostructured complex oxides as a route towards thermal behavior in artificial spin ice systems. United States. doi:10.1103/PhysRevMaterials.1.024401.
Chopdekar, Rajesh V., Li, Binzhi, Wynn, Thomas A., Lee, Michael S., Jia, Y., Liu, Zhiqi, Biegalski, Michael D., Retterer, Scott T., Young, Anthony T., Scholl, Andreas, and Takamura, Y. Wed . "Nanostructured complex oxides as a route towards thermal behavior in artificial spin ice systems". United States. doi:10.1103/PhysRevMaterials.1.024401.
@article{osti_1394557,
title = {Nanostructured complex oxides as a route towards thermal behavior in artificial spin ice systems},
author = {Chopdekar, Rajesh V. and Li, Binzhi and Wynn, Thomas A. and Lee, Michael S. and Jia, Y. and Liu, Zhiqi and Biegalski, Michael D. and Retterer, Scott T. and Young, Anthony T. and Scholl, Andreas and Takamura, Y.},
abstractNote = {Here, we have used soft x-ray photoemission electron microscopy to image the magnetization of single-domain La0.7Sr0.3MnO3 nanoislands arranged in geometrically frustrated configurations such as square ice and kagome ice geometries. Upon thermal randomization, ensembles of nanoislands with strong interisland magnetic coupling relax towards low-energy configurations. Statistical analysis shows that the likelihood of ensembles falling into low-energy configurations depends strongly on the annealing temperature. Annealing to just below the Curie temperature of the ferromagnetic film (TC = 338 K) allows for a much greater probability of achieving low-energy configurations as compared to annealing above the Curie temperature. At this thermally active temperature of 325 K, the ensemble of ferromagnetic nanoislands explore their energy landscape over time and eventually transition to lower energy states as compared to the frozen-in configurations obtained upon cooling from above the Curie temperature. Thus, this materials system allows for a facile method to systematically study thermal evolution of artificial spin ice arrays of nanoislands at temperatures modestly above room temperature.},
doi = {10.1103/PhysRevMaterials.1.024401},
journal = {Physical Review Materials},
issn = {2475-9953},
number = 2,
volume = 1,
place = {United States},
year = {2017},
month = {7}
}

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