Noninvasive measurements of spin transport properties of an antiferromagnetic insulator

Wang, Hailong; Zhang, Shu; McLaughlin, Nathan J.; Flebus, Benedetta; Huang, Mengqi; Xiao, Yuxuan; Liu, Chuanpu; Wu, Mingzhong; Fullerton, Eric E.; Tserkovnyak, Yaroslav; Du, Chunhui Rita

doi:10.1126/sciadv.abg8562

Title: Noninvasive measurements of spin transport properties of an antiferromagnetic insulator

Journal Article · 06 January 2022 · Science Advances

DOI: https://doi.org/10.1126/sciadv.abg8562 · OSTI ID:1904352

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Univ. of California, San Diego, La Jolla, CA (United States); OSTI
Univ. of California, San Diego, La Jolla, CA (United States)
Univ. of Texas, Austin, TX (United States); Boston College, Chestnut Hill, MA (United States)
Colorado State Univ., Fort Collins, CO (United States)
Univ. of California, Los Angeles, CA (United States)

Antiferromagnetic insulators (AFIs) are of substantial interest because of their potential in the development of next-generation spintronic devices. One major effort in this emerging field is to harness AFIs for long-range spin information communication and storage. Here, we report a noninvasive method to optically access the intrinsic spin transport properties of an archetypical AFI α-Fe₂O₃ via nitrogen-vacancy (NV) quantum spin sensors. By NV relaxometry measurements, we successfully detect the frequency-dependent dynamic fluctuations of the spin density of α-Fe₂O₃ along the Néel order parameter, from which an intrinsic spin diffusion constant of α-Fe₂O₃ is experimentally measured in the absence of external spin biases. Our results highlight the significant opportunity offered by NV centers in diagnosing the underlying spin transport properties in a broad range of high-frequency magnetic materials such as two-dimensional magnets, spin liquids, and magnetic Weyl semimetals, which are challenging to access by the conventional measurement techniques.

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Research Organization:: Univ. of California, San Diego, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)

Grant/Contract Number:: SC0019273

OSTI ID:: 1904352

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 1 Vol. 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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