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Magnetic-Field-Dependent THz Emission of Spintronic TbFe/Pt Layers

  • Robert Schneider
    Robert Schneider
    Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
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  • , 
  • Mario Fix
    Mario Fix
    Institute of Physics, University of Augsburg, Universitätsstr. 1 Nord, 86159 Augsburg, Germany
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  • , 
  • Richard Heming
    Richard Heming
    Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
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  • , 
  • Steffen Michaelis de Vasconcellos
    Steffen Michaelis de Vasconcellos
    Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
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    Orcidhttp://orcid.org/0000-0003-3584-0635
  • , 
  • Manfred Albrecht
    Manfred Albrecht
    Institute of Physics, University of Augsburg, Universitätsstr. 1 Nord, 86159 Augsburg, Germany
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  • , and 
  • Rudolf Bratschitsch*
    Rudolf Bratschitsch
    Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
    *E-mail: [email protected]
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    Orcidhttp://orcid.org/0000-0002-2368-2548
Cite this: ACS Photonics 2018, 5, 10, 3936–3942
Publication Date (Web):September 9, 2018
https://doi.org/10.1021/acsphotonics.8b00839
Copyright © 2018 American Chemical Society
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    Abstract

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    We measure the THz emission of a layered spintronic system based on platinum (Pt) and terbium–iron (TbxFe1–x) alloys for the entire range of Tb content (0 ≤ x ≤ 1) under different external applied magnetic fields. We find that the THz emission amplitude closely follows the in-plane magnetization. Deviations occur when the ferrimagnetic TbFe layer changes from an in-plane to an out-of-plane easy axis at x = 0.2, and in the medium composition range x = 0.45–0.55, where Tb magnetic moments dominate the total magnetic moment. The increasing influence of Tb also leads to an inverted THz amplitude for samples with comparable Fe and Tb contents. The THz emission is highest for TbxFe1–x/Pt samples with small amounts of Tb (x = 0.03–0.15) due their reduced electrical conductivity compared to pure Fe/Pt and strongly decreases with increasing Tb content by 2 orders of magnitude. Our systematic study paves the way for designing optimized spintronic THz emitters and demonstrates that transient THz spectroscopy is a powerful tool to gain insight into complex magnetic systems.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsphotonics.8b00839.

    • Details of the temperature-dependent magnetic properties of the TbxFe1–x samples, additional information for the experimental setup, THz peak-to-peak amplitudes as a function of the magnetic field for samples with Si3N4 capping layer, and DC conductivity measurements and a THz, as well as magnetic hysteresis measurements on the samples Tb0.1Fe0.9/Pt and Tb0.55Fe0.45/Pt (PDF).

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