Spin-Charge Interconversion In A Dirac Semimetal

What Has Been Achieved:

We used MBE to Dirac semimetal/ferromagnet metal (Cd3As2/Ni0.8Fe0.2) heterostructures and measured spin-charge interconversion using spin pumping and spin torque ferromagnetic resonance. Importance of the Achievement: This work showed efficient spin-charge interconversion in a Dirac semimetal and revealed a surprising enhancement in the interconversion efficiency with an oxidized interface.

Unique Feature(s) of the MIP that Enabled this Achievement:

The 2DCC HIVE was integral to proving the Dirac semimetal nature of the MBE-grown Cd3As2 films.

Publication:

Wilson Yanez , Yongxi Ou , Run Xiao , Jahyun Koo, Jacob T. Held , Supriya Ghosh, Jeffrey Rable, Timothy Pillsbury, Enrique González Delgado, Kezhou Yang, Juan Chamorro, Alexander J. Grutter, Patrick Quarterman, Anthony Richardella, Abhronil Sengupta, Tyrel McQueen, Julie A. Borchers, K. Andre Mkhoyan, Binghai Yan, and Nitin Samarth, Physical Review Applied 16, 054301 (2021). 

DOI: 10.1103/physrevapplied.16.054031

The principal support for this project was provided by SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by the National Institute of Standards and Technology (NIST). This supported the synthesis and standard characterization of Py/Cd3As2 heterostructures as well as spin-charge interconversion measurements (WY, YO, NS) and their characterization using STEM (JH, SG, AM). Additional support for materials synthesis was provided by the Institute for Quantum Matter under DOE EFRC grant DE-SC0019331 (RX, JC, NS, TM). The Penn State Two-Dimensional Crystal Consortium- Materials Innovation Platform (2DCC-MIP) under NSF Grant No. DMR-1539916 provided support for ARPES measurements (YO, TP, AR, NS). The magnetometry measurements were carried out by JR, supported by a grant from the University of Chicago. Part of this work was car- ried out in the College of Science and Engineering Characterization Facility, University of Minnesota, which has received capital equipment funding from the National Science Foundation through the UMN MRSEC under Award Number DMR-2011401 (JH, SG, AM). EG acknowledges support for an undergraduate summer internship from the Office of Graduate Educational Equity Programs and Eberly College of Science at the Pennsylvania State University. B.Y. acknowledges the financial support by the European Research Council (ERC Consolidator Grant No. 815869). Certain commercial equipment, instruments, or materials (or suppliers, or software, etc.) are identified in this paper to foster understanding. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.