Probing intrinsic magnetization dynamics of the Y3Fe5 O12/Bi2Te3 interface at low temperature

A. R. Will-Cole, Valeria Lauter, Alexander Grutter, Carsten Dubs, David A. Lidsky, Morris Lindner, Timmy Reimann, Nirjhar Bhattacharjee, Tzu Ming Lu, Peter Sharma, Nichole R. Valdez, Charles J. Pearce, Todd C. Monson, Matthew Matzelle, Arun Bansil, Don Heiman, Nian X. Sun

Research output: Contribution to journalArticlepeer-review

Abstract

Topological insulator-magnetic insulator (TI-MI) heterostructures hold significant promise in the field of spintronics, offering the potential for manipulating magnetization through topological surface state-enabled spin-orbit torque. However, many TI-MI interfaces are plagued by issues such as contamination within the magnetic insulator layer and the presence of a low-density transitional region of the topological insulator. These interfacial challenges often obscure the intrinsic behavior of the TI-MI system. In this study, we addressed these challenges by depositing sputtered Bi2Te3 on liquid phase epitaxy grown Y3Fe5O12/Gd3Ga5O12. The liquid phase epitaxy grown Y3Fe5O12 has been previously shown to have exceptional interface quality, without an extended transient layer derived from interdiffusion processes of the substrate or impurity ions, thereby eliminating rare-earth impurity-related losses in the MI at low temperatures. At the TI-MI interface, high-resolution depth-sensitive polarized neutron reflectometry confirmed the absence of a low-density transitional growth region of the TI. By overcoming these undesirable interfacial effects, we isolate and probe the intrinsic low-temperature magnetization dynamics and transport properties of the TI-MI interface. Our findings revealed strong spin pumping at low temperatures, accompanied by an additional in-plane anisotropy. The enhanced spin pumping at low temperatures is correlated with the observed suppression of bulk conduction and the weak antilocalization in the TI film, highlighting the interplay between the transport and spin pumping behavior in the TI-MI system.

Original languageEnglish
Article number074409
JournalPhysical Review Materials
Volume8
Issue number7
DOIs
StatePublished - Jul 2024

Funding

A.R.W.-C. and N.X.S. acknowledge financial support from NSF TANMS ERC under Award No. 1160504. A.R.W.-C. was supported by the National Defense Science and Engineering Graduate Fellowship of the Office of Naval Research. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. ORISE is managed by ORAU under Contract No. DE-SC0014664. A portion of this research used resources at Sandia National Laboratories. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy's National Nuclear Security Administration under Contract No. DE-NA0003525. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. A.R.W.-C. and V.L. thank Haile Ambaye for his assistance during the setup of the PNR experiment. The work of C.D. was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Grant No. 271741898. The work of M.L. was supported by the German Bundesministerium f\u00FCr Wirtschaft und Energie (BMWi) under Grant No. 49MF180119. C.D. thanks O. Surzhenko for preliminary studies on FMR characterization of samples at room temperature and R. Meyer (INNOVENT e.V.) for their technical support. D.H. acknowledges partial support by the National Science Foundation under Grant No. DMR-1905662 and the Air Force Office of Scientific Research under Award No. FA9550-20-1-0247. A.R.W.-C. and N.X.S. acknowledge financial support from NSF TANMS ERC under Award No. 1160504. A.R.W.-C. was supported by the National Defense Science and Engineering Graduate Fellowship of the Office of Naval Research. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. ORISE is managed by ORAU under Contract No. DE-SC0014664. A portion of this research used resources at Sandia National Laboratories. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy's National Nuclear Security Administration under Contract No. DE-NA0003525. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. A.R.W.-C. and V.L. thank Haile Ambaye for his assistance during the setup of the PNR experiment. The work of C.D. was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Grant No. 271741898. The work of M.L. was supported by the German Bundesministerium for Wirtschaft und Energie (BMWi) under Grant No. 49MF180119. C.D. thanks O. Surzhenko for preliminary studies on FMR characterization of samples at room temperature and R. Meyer (INNOVENT e.V.) for their technical support. D.H. acknowledges partial support by the National Science Foundation under Grant No. DMR-1905662 and the Air Force Office of Scientific Research under Award No. FA9550-20-1-0247.

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