Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B55: Spin Dynamics and Torques
11:30 AM–2:30 PM,
Monday, March 6, 2023
Room: Room 305
Sponsoring
Unit:
GMAG
Chair: Nanna Zhou Hagström, University of California, Davis
Abstract: B55.00004 : Visualization of spin-wave propagation dynamics using laser-free GHz stroboscopic transmission electron microscopy*
12:30 PM–12:42 PM
Presenter:
Chuhang Liu
(Stony Brook University (SUNY))
Authors:
Chuhang Liu
(Stony Brook University (SUNY))
Spencer A Reisbick
(Brookhaven National Laboratory)
Myung-Geun Han
(Brookhaven National Laboratory)
Alexandre Pofelski
(Brookhaven National Laboratory)
Chunguang Jing
(Euclid Techlabs)
Yimei Zhu
(Brookhaven National Laboratory)
With the development of the laser-free ultrafast electron microscope (UEM) at Brookhaven National Laboratory, direct visualization of materials’ structural dynamics with nanometer-picosecond spatiotemporal resolution can be achieved. Instead of using laser pulses as the excitation pump, transverse radio frequency (RF) electrical signals are sent to the sample devices via an impedance matched RF sample holder. The dynamics can then be probed by the temporally synchronized electron pulse-trains generated by a RF cavity installed in the UEM.
In this work, we study the spin-wave propagation dynamics in patterned permalloy (Py, Ni80Fe20) thin films using the laser-free UEM in Lorentz mode. Oscillating magnetic fields generated by the microwave currents are applied as local excitation to the Py pattern via a coplanar waveguide (CPW). The dynamics of spin-wave excitation from various magnetic domain configurations will be reported and discussed. Micromagnetic simulations will also be presented to compare with the experimental results.
*The work was supported by DOE-BES, Materials Science and Engineering Division under Contract No. DESC0012704.
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