Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Terahertz spintronics

MA 22.6: Vortrag

Dienstag, 2. April 2019, 15:15–15:30, H52

Magnetic-Field-Dependent THz Emission of Ferrimagnetic Rare Earth Transition Metal Alloys Combined with Pt — •Mario Fix¹, Robert Schneider², Richard Heming², Steffen Michaelis de Vasconcellos², Rudolf Bratschitsch², and Manfred Albrecht¹ — ¹Institute of Physics, University of Augsburg, Universitätsstr. 1 Nord, 86159 Augsburg, Germany — ²Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Bi-/multilayer structures of ferro-/ferrimagnetic (FM) and non-magnetic (NM) metals have been shown to be THz emitters when excited by femtosecond laser pulses.[1-3] Amplitude and frequency of the emitted THz radiation depend on the film thickness, the electric and magnetic properties of the FM layer, and the spin-Hall conductivity of the NM layer and can therefore be tuned by changing the composition of the used layer stack.[4]

Here we report on the THz emission of ferrimagnetic rare earth transition metal alloys combined with Pt. All films were magnetron sputter deposited at room temperature. The dependence of the THz radiation on the sample magnetization has been investigated with respect to the composition of the ferrimagnetic layers.
References:
T. Kampfrath et al., Nature Nanotechnology 8, 256-260 (2013).
R. Schneider et al., ACS Photonics 5, 3936-3942 (2018).
D. Yang et al., Advanced Optical Materials 4, 1944-1949 (2016).
T. Seifert et al., Nature Photonics 10, 483-488 (2016).