Benjamin Jungfleisch (U. of Delaware)

When:
February 22, 2019 @ 1:30 pm – 2:30 pm

NEW TWISTS FOR MAGNONS
Matthias Benjamin Jungfleisch
Department of Physics and Astronomy
University of Delaware

mbj@udel.edu

In recent years, the exploration of magnons, the quanta of spin waves, as carriers of spin-angular momentum has flourished in spintronics. Magnon spintronics aims at developing novel functional devices that combine magnonic and electronic spin transport phenomena.
In particular, magnetic metamaterials such as artificial spin ice and magnonic crystals offer unique possibilities in magnon spintronics. Here, we present results on high-frequency dynamics in metallic artificial spin-ice lattices by employing broadband ferromagnetic resonance spectroscopy [1]. Furthermore, we explore the possibility to drive and to detect spin dynamics in those systems by dc electrical means using the spin Hall effect [2,3].
Besides magnetic metamaterials, magnetic insulators such as yttrium iron garnet (YIG) are ideal materials for magnonic and spintronic research since they feature long magnon propagation distances and coherence times. Here, we demonstrate the propagation of spin waves in nanometer-thick YIG waveguides [4] and the electric excitation and detection of spin dynamics via pure spin currents by the spin Hall effect in YIG/Pt micro- and nanostructures [5,6].

This work was supported by the U.S. Department of Energy, Office of Science, Materials Science and Engineering Division.

REFERENCES:
[1] M. B. Jungfleisch et al., Phys. Rev. B 93, 100401(R) (2016).
[2] M. B. Jungfleisch et al., Appl. Phys. Lett. 108, 052403 (2016).
[3] M. B. Jungfleisch et al., Phys. Rev. Applied 8, 064026 (2017).
[4] M. B. Jungfleisch et al., J. Appl. Phys 117, 17D128 (2015).
[5] M. B. Jungfleisch et al., Phys. Rev. Lett. 116, 057601 (2016).
[6] M. B. Jungfleisch et al., Nano Lett. 17, 8 (2017).

 

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