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

Kempinger, Susan; Fraleigh, Robert D.; Lammert, Paul E.; Zhang, Sheng; Crespi, Vincent H.; Schiffer, Peter; Samarth, Nitin

doi:10.1103/PhysRevResearch.2.012001

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

Journal Article · Thu Jan 02 00:00:00 EST 2020 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.2.012001· OSTI ID:1580789

Kempinger, Susan; Fraleigh, Robert D.; Lammert, Paul E.; Zhang, Sheng; Crespi, Vincent H.; Schiffer, Peter;

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.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0010778

OSTI ID:: 1580789

Alternate ID(s):: OSTI ID: 1594862

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Vol. 2 Journal Issue: 1; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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