Efficient Excitation of Perpendicular Standing Spin-Waves in Undulating CoFeB Films

POSTER

Abstract

We report on efficient excitation of perpendicular standing spin-waves (PSSWs) in undulating CoFeB films. PSSWs are exchange dominated spin-waves and have been observed through non-uniform excitation of spin-waves across a ferromagnetic (FM) layer film, and current methods have proven to be inefficient, resulting in weak excitations. We achieve efficient coupling to PSSWs by creating periodic undulations in 100 nm thick CoFeB. The S11 parameter was measured using coplanar waveguides and a network analyzer. An additional mode, not present in flat control samples, was observed for undulating CoFeB films. We attributed this mode to PSSWs being excited due to the non-uniform excitation of spin-waves across the thickness of the FM film. The dispersion relations for Magnetostatic surface spin-waves (MSSW) and PSSWs were used to fit the measured curves and determine key material and excitation parameters such as the exchange constant. Simulations were also used to visualize the dynamics of the oscillations in the CoFeB film. Efficient excitation of such exchange coupled spin-waves can help realize spintronic applications where exchange coupled magnetic oscillations are critical. These undulating structures also provide a simple method to measure the exchange constant for thin FM films.

Presenters

  • Aryan Navabi

    • Univ of California - Los Angeles

Authors

  • Aryan Navabi

    • Univ of California - Los Angeles

  • Cai Chen

    • Mechanical and Aerospace Engineering Department, Univ of California - Los Angeles
    • Univ of California - Los Angeles

  • Anthony Barra

    • Department of Mechanical and Aerospace Engineering, UCLA
    • Univ of California - Los Angeles
    • Department of Mechanical and Aerospace Engineering, University of California, Los Angeles

  • Mohsen Yazdani

    • Univ of California - Los Angeles

  • Guoqiang Yu

    • University of California, Los Angeles
    • Univ of California - Los Angeles
    • Department of Electrical Engineering, UCLA
    • BeiHang University
    • Electrical Engineering, University of California Los Angeles

  • Mohammed Aldosary

    • Physics and Astronomy, University of Calirfornia, Riverside
    • University of California, Riverside

  • Junxue Li

    • Univ of California - Riverside
    • Physics and Astronomy, University of Calirfornia, Riverside
    • Physics, Univ of California - Riverside
    • University of California, Riverside
    • Physics and Astronomy Department, University of California Riverside

  • Mohammad Montazeri

    • Univ of California - Los Angeles

  • Kin Wong

    • Univ of California - Los Angeles

  • Jing Shi

    • Univ of California - Riverside
    • Physics and Astronomy, University of Calirfornia, Riverside
    • University of California, Riverside
    • Physics, Univ of California - Riverside
    • Physics and Astronomy Department, University of California Riverside

  • Greg Carman

    • Department of Mechanical and Aerospace Engineering, UCLA
    • MAE Department, UCLA
    • Mechanical and Aerospace Engineering, University of California, Los Angeles
    • Mechanical and Aerospace Engineering Department, University of California, Los Angeles
    • Mechanical and Aerospace Engineering Department, Univ of California - Los Angeles
    • Univ of California - Los Angeles
    • Department of Mechanical and Aerospace Engineering, University of California, Los Angeles

  • Abdon Sepulveda

    • MAE Department, UCLA
    • Mechanical and Aerospace Engineering, University of California, Los Angeles
    • Mechanical and Aerospace Engineering Department, University of California, Los Angeles
    • Mechanical and Aerospace Engineering Department, Univ of California - Los Angeles
    • Univ of California - Los Angeles

  • Pedram Khalili Amiri

    • Northwestern University

  • Kang Wang

    • University of California, Los Angeles
    • Univ of California - Los Angeles
    • Department of Electrical Engineering, University of California, Los Angeles
    • Department of Electrical Engineering, UCLA
    • University of California Los Angeles
    • UCLA
    • Department of Electrical Engineering, Univ of California - Los Angeles
    • Electrical and Computer Engineering, University of California, Los Angeles
    • Electrical Engineering, UCLA