@article{d59f90fd261d49208c972de7bc9eaa48,
title = "Single-Molecule Toroic Design through Magnetic Exchange Coupling",
abstract = "The big data era calls for larger capacity of our hard drive, which in turn depends on the number of magnetic units that store bits of 1 or 0. However, as the density of these units increases, flipping one unit without affecting another becomes more difficult because of undesired magnetic perturbations from the reading/writing heads. Single-molecule toroics (SMTs) that exploit vortex-like magnetic structures are insensitive to homogeneous magnetic fields and hence are promising for next-generation ultra-dense information storage. However, the synthesis of such molecular materials is challenging. Here, we show by using ferromagnetic interactions that this target can be realized in a 16-membered heterometallic cluster {Fe8Dy8}, which shows a stable 4-fold degenerated magnetic toroidal ground state at low temperatures. This is significantly distinguished from the most studied dipole-dipole interaction-based SMTs and demonstrates a promising strategy for the next generation of SMT design.",
keywords = "MAP1: Discovery",
author = "Zhang, {Hao Lan} and Zhai, {Yuan Qi} and Lei Qin and Liviu Ungur and Hiroyuki Nojiri and Zheng, {Yan Zhen}",
note = "Funding Information: This work was supported by the Natural Science Foundation of China (nos. 21773130 and 21971203), Shenzhen Science and Technology Program (JCYJ20180306170859634), State Key Laboratory for Mechanical Behavior of Materials (20182006), Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology (201805056ZD7CG40), Cyrus Chung Ying Tang Foundation, Fundamental Research Funds for the Central Universities, and GIMRT program of Tohoku University. We also thank Mr. Gang Chang at the Instrument Analysis Center of Xi'an Jiaotong University for his assistance with elemental analysis. The scientific grants R-143-000-A80-114 and R-143-000-A65-133 from the National University of Singapore are gratefully acknowledged. Computational resources from NSCC (ASPIRE-1, grant 11001278) were used for this study. Y.-Z.Z. designed and directed the project. H.-L.Z. and L.Q. carried out the synthesis and most of the characterization. Y.-Q.Z. and L.U. carried out the detailed ab initio calculations. H.N. measured the low-temperature HF-EPR magnetic data. H.-L.Z. Y.-Q.Z. L.Q. L.U. and Y.-Z.Z. wrote the manuscript. All authors contributed to important discussions and suggestions on the manuscript. The authors declare no competing interests. Funding Information: This work was supported by the Natural Science Foundation of China (nos. 21773130 and 21971203 ), Shenzhen Science and Technology Program ( JCYJ20180306170859634 ), State Key Laboratory for Mechanical Behavior of Materials ( 20182006 ), Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology ( 201805056ZD7CG40 ), Cyrus Chung Ying Tang Foundation , Fundamental Research Funds for the Central Universities , and GIMRT program of Tohoku University . We also thank Mr. Gang Chang at the Instrument Analysis Center of Xi'an Jiaotong University for his assistance with elemental analysis. The scientific grants R-143-000-A80-114 and R-143-000-A65-133 from the National University of Singapore are gratefully acknowledged. Computational resources from NSCC (ASPIRE-1, grant 11001278 ) were used for this study. Publisher Copyright: {\textcopyright} 2020 Elsevier Inc.",
year = "2020",
month = jun,
day = "3",
doi = "10.1016/j.matt.2020.02.021",
language = "English",
volume = "2",
pages = "1481--1493",
journal = "Matter",
issn = "2590-2393",
publisher = "Cell Press",
number = "6",
}