@article{04540f69baef4447a58b4f0810bda764,
title = "Dirac surface state–modulated spin dynamics in a ferrimagnetic insulator at room temperature",
abstract = "This work demonstrates markedly modified spin dynamics of magnetic insulator (MI) by the spin momentum–locked Dirac surface states of the adjacent topological insulator (TI), which can be harnessed for spintronic applications. As the Bi concentration x is systematically tuned in 5-nm-thick (BixSb1−x)2Te3 TI films, the weight of the surface relative to bulk states peaks at x = 0.32 when the chemical potential approaches the Dirac point. At this concentration, the Gilbert damping constant of the precessing magnetization in 10-nm-thick Y3Fe5O12 MI films in the MI/TI heterostructures is enhanced by an order of magnitude, the largest among all concentrations. In addition, the MI acquires additional strong magnetic anisotropy that favors the in-plane orientation with similar Bi concentration dependence. These extraordinary effects of the Dirac surface states distinguish TI from other materials such as heavy metals in modulating spin dynamics of the neighboring magnetic layer.",
author = "Chi Tang and Qi Song and Chang, {Cui Zu} and Yadong Xu and Yuichi Ohnuma and Mamoru Matsuo and Yawen Liu and Wei Yuan and Yunyan Yao and Moodera, {Jagadeesh S.} and Sadamichi Maekawa and Wei Han and Jing Shi",
note = "Funding Information: We acknowledge the assistance from N. Samarth and J. Kally for the sample preparation and useful discussions with Z. Shi, J. Li, V. Ortiz, and M. Aldosary. This work was supported as part of the Spins and Heat in Nanoscale Electronic Systems, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under award no. SC0012670 (C.T., Y.X., Y.L., and J.S.). Q.S., W.Y., Y.Y., and W.H. acknowledge the support of the National Basic Research Programs of China (973 grants 2014CB920902 and 2015CB921104) and the National Natural Science Foundation of China (grant 11574006). C.-Z.C. and J.S.M. acknowledge the support of the NSF under grant nos. DMR-1207469 and 1700137, the Office of Naval Research under grant nos. N00014-13-1- 0301 and N00014-16-1-2657, and the STC (Science and Technology Center) Center for Integrated Quantum Materials under NSF grant no. DMR-1231319. Y.O., M.M., and S.M. acknowledge the support of the Exploratory Research for Advanced Technology–Japan Science and Technology Agency (JPMJER1402) and the Grant-in-Aid for Scientific Research on Innovative Areas Nano Spin Conversion Science (26103006), Grant-in-Aid for Scientific Research C (JP15K05153), and Grant-in-Aid for Scientific Research B (JP16H04023 and JP17H02927) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. Publisher Copyright: Copyright {\textcopyright} 2018 The Authors.",
year = "2018",
month = jun,
day = "1",
doi = "10.1126/sciadv.aas8660",
language = "English",
volume = "4",
journal = "Science advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "6",
}