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

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.

doi:10.1103/PhysRevMaterials.1.024401

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

Journal Article · Wed Jul 05 00:00:00 EDT 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.024401· OSTI ID:1394557

Chopdekar, Rajesh V. ^[1]; Li, Binzhi ^[1]; Wynn, Thomas A. ^[1]; Lee, Michael S. ^[1]; Jia, Y. ^[1]; Liu, Zhiqi ^[2]; Biegalski, Michael D. ^[2];

^[2]; Young, Anthony T. ^[3]; Scholl, Andreas ^[3]; Takamura, Y. ^[1]

Univ. of California, Davis, CA (United States). Dept. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Here, we have used soft x-ray photoemission electron microscopy to image the magnetization of single-domain La_0.7Sr_0.3MnO₃ 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 (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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; DMR 1411250

OSTI ID:: 1394557

Alternate ID(s):: OSTI ID: 1368429

Journal Information:: Physical Review Materials, Vol. 1, Issue 2; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Advances in artificial spin ice Skjærvø, Sandra H.; Marrows, Christopher H.; Stamps, Robert L. Nature Reviews Physics, Vol. 2, Issue 1 https://doi.org/10.1038/s42254-019-0118-3	journal	November 2019
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