Correlated Magnetic Properties in Ultra-low Damping Ferromagnetic and Heavy Metal Bilayers

ORAL

Abstract

For both spin torque oscillators and switching devices using heavy metal/ferromagnetic (HM/FM) structures, low-damping ferromagnets (FM) are highly desirable. Using momentum-resolved Brillouin light scattering, we investigate a series of epitaxially grown Pt (3 nm)/CoxFe1-x bilayers that exhibit the lowest damping in metallic FMs. Taking into account saturation magnetization and lattice constant from other measurements, we extract several critical parameters including the volumetric and interfacial Dzyaloshinskii-Moriya interaction constants, exchange stiffness, exchange length, effective damping, spin mixing conductance as a function of FM layer thickness.

*The work at UT-Austin is primarily supported by the National Science Foundation through the Center for Dynamics and Control of Materials: an NSF MRSEC under Cooperative Agreement No. DMR-1720595. L. C. acknowledges support from FCT -Portugal for the grant UTAP-EXPL/NTec/0046/2017. The work at Ohio State was supported by the Center for Emergent Materials, an NSF MRSEC, under Grant No. DMR-2011876.The work at Academia Sinica was supported by AS-TP-107-M04 and the Ministry of Science and Technology 105-2112=M-001-031-MY3 in Taiwan.

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Presenters

  • David Lujan

    • Department of Physics, University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin
    • University of Texas at Austin

Authors

  • David Lujan

    • Department of Physics, University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin
    • University of Texas at Austin

  • Aidan J Lee

    • Ohio State Univ - Columbus
    • Physics, Ohio State University

  • Tsun Chun Chang

    • University of Texas at Austin

  • Timothy N Nunley

    • University of Texas at Austin

  • Kemal Sobotkiewich

    • University of Texas at Austin

  • Shang-Fan Lee

    • Academia Sinica
    • Institute of Physics, Academia Sinica
    • Physics, Academia Sinica

  • Fengyuan Yang

    • Ohio State Univ - Columbus
    • Deparment of Physics, The Ohio State University
    • Department of Physics, The Ohio State University
    • Physics, The Ohio State University
    • Department of Physics, Ohio State University
    • The Ohio State University
    • Physics, Ohio State University
    • Physics Department, The Ohio State University, Columbus, Ohio 43210

  • Xiaoqin (Elaine) Li

    • University of Texas at Austin
    • Physics, University of Texas at Austin
    • Department of Physics, University of Texas at Austin
    • U.T. Austin
    • Department of Physics, The University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin