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Depth-Resolved Magnetization Dynamics Revealed by X-Ray Reflectometry Ferromagnetic Resonance

D. M. Burn1,*, S. L. Zhang2,3,†, G. Q. Yu4, Y. Guang4, H. J. Chen5, X. P. Qiu5, G. van der Laan1,‡, and T. Hesjedal6

  • 1Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
  • 2School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
  • 3ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 200031, China
  • 4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5Shanghai Key Laboratory of Special Artificial Microstructure Materials and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
  • 6Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom

  • *Corresponding author. david.burn@diamond.ac.uk
  • †Corresponding author. zhangshl1@shanghaitech.edu.cn
  • ‡Corresponding author. Gerrit.vanderLaan@diamond.ac.uk
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Phys. Rev. Lett. 125, 137201 – Published 24 September, 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.137201

Abstract

Magnetic multilayers offer diverse opportunities for the development of ultrafast functional devices through advanced interface and layer engineering. Nevertheless, a method for determining their dynamic properties as a function of depth throughout such stacks has remained elusive. By probing the ferromagnetic resonance modes with element-selective soft x-ray resonant reflectivity, we gain access to the magnetization dynamics as a function of depth. Most notably, using reflectometry ferromagnetic resonance, we find a phase lag between the coupled ferromagnetic layers in [CoFeB/MgO/Ta]4 multilayers that is invisible to other techniques. The use of reflectometry ferromagnetic resonance enables the time-resolved and depth-resolved probing of the complex magnetization dynamics of a wide range of functional magnetic heterostructures with absorption edges in the soft x-ray wavelength regime.

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Shining a Light on Hidden Spin Dynamics

Published 24 September, 2020

Researchers combine ferromagnetic resonance with x-ray reflectivity to map out the complex spin behavior of a magnetic multilayer.

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Phys. Rev. Lett. 125, 137201– Published 24 September, 2020
  • Received 8 July 2020
  • Revised 29 July 2020
  • Accepted 13 August 2020
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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