Abstract
We study the temperature and magnetic field dependence of the total magnetic moment of large-area permalloy artificial square spin ice arrays. The temperature dependence and hysteresis behavior are consistent with the coherent magnetization reversal expected in the Stoner-Wohlfarth model, with clear deviations due to interisland interactions at small lattice spacing. Through micromagnetic simulations, we explore this behavior and demonstrate that the deviations result from increasingly complex magnetization reversal at small lattice spacing, induced by interisland interactions, and depending critically on details of the island shapes. These results establish new means to tune the physical properties of artificial spin ice structures and other interacting nanomagnet systems, such as patterned magnetic media.
| Original language | English (US) |
|---|---|
| Article number | 067201 |
| Journal | Physical review letters |
| Volume | 129 |
| Issue number | 6 |
| DOIs | |
| State | Published - Aug 5 2022 |
Bibliographical note
Funding Information:Lithography and experimental measurements were conducted by N. S. B., X. Z., and P. S. at Yale University and were funded by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Grant No. DE-SC0020162. Sample growth was performed by J. R. and C. L. at the University of Minnesota and was supported by NSF through Grant No. DMR-2103711. Simulations were conducted by O. H. at Argonne National Laboratory with funding from the U.S. Department of Energy, Office of Science, Basic Energy Sciences Division of Materials Sciences and Engineering. Data analysis and manuscript preparation were performed by N. S. B., O. H., C. L., and P. S.. We gratefully acknowledge the computing resources provided on Blues, a high-performance computing cluster operated by the Laboratory Computing Resource Center at Argonne National Laboratory. We would also like to acknowledge Zhixin Zhang and Axel Hoffmann for the useful discussions and verification.
Publisher Copyright:
© 2022 American Physical Society.