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Title: Imaging the stochastic microstructure and dynamic development of correlations in perpendicular artificial spin ice

Abstract

We use spatially resolved magneto-optical Kerr microscopy to track the complete microstates of arrays of perpendicular anisotropy nanomagnets during magnetization hysteresis cycles. These measurements, along with our statistical methodology, allow us to disentangle the intertwined effects of nearest-neighbor interactions, disorder, and stochasticity on magnetization switching. We find that the nearest-neighbor correlations depend on both interaction strength and disorder. We also find that although the global characteristics of the hysteretic switching are repeatable, the exact microstate sampled is stochastic with the behavior of individual islands varying between nominally identical runs. These protocols provide another way of understanding the relationship between macrohistory and microhistory in artificial magnetic arrays.

Authors:
; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1580789
Alternate Identifier(s):
OSTI ID: 1594862
Grant/Contract Number:  
SC0010778
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 1; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kempinger, Susan, Fraleigh, Robert D., Lammert, Paul E., Zhang, Sheng, Crespi, Vincent H., Schiffer, Peter, and Samarth, Nitin. Imaging the stochastic microstructure and dynamic development of correlations in perpendicular artificial spin ice. United States: N. p., 2020. Web. doi:10.1103/PhysRevResearch.2.012001.
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Kempinger, Susan, Fraleigh, Robert D., Lammert, Paul E., Zhang, Sheng, Crespi, Vincent H., Schiffer, Peter, & Samarth, Nitin. Imaging the stochastic microstructure and dynamic development of correlations in perpendicular artificial spin ice. United States. doi:10.1103/PhysRevResearch.2.012001.
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Kempinger, Susan, Fraleigh, Robert D., Lammert, Paul E., Zhang, Sheng, Crespi, Vincent H., Schiffer, Peter, and Samarth, Nitin. Thu . "Imaging the stochastic microstructure and dynamic development of correlations in perpendicular artificial spin ice". United States. doi:10.1103/PhysRevResearch.2.012001.
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@article{osti_1580789,
title = {Imaging the stochastic microstructure and dynamic development of correlations in perpendicular artificial spin ice},
author = {Kempinger, Susan and Fraleigh, Robert D. and Lammert, Paul E. and Zhang, Sheng and Crespi, Vincent H. and Schiffer, Peter and Samarth, Nitin},
abstractNote = {We use spatially resolved magneto-optical Kerr microscopy to track the complete microstates of arrays of perpendicular anisotropy nanomagnets during magnetization hysteresis cycles. These measurements, along with our statistical methodology, allow us to disentangle the intertwined effects of nearest-neighbor interactions, disorder, and stochasticity on magnetization switching. We find that the nearest-neighbor correlations depend on both interaction strength and disorder. We also find that although the global characteristics of the hysteretic switching are repeatable, the exact microstate sampled is stochastic with the behavior of individual islands varying between nominally identical runs. These protocols provide another way of understanding the relationship between macrohistory and microhistory in artificial magnetic arrays.},
doi = {10.1103/PhysRevResearch.2.012001},
journal = {Physical Review Research},
number = 1,
volume = 2,
place = {United States},
year = {2020},
month = {1}
}
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DOI: 10.1103/PhysRevResearch.2.012001
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