Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 45: Magnonics I
MA 45.3: Talk
Thursday, March 19, 2020, 10:00–10:15, HSZ 401
Investigation of spin wave focusing by a magnetic field gradient — •Philipp Geyer1, Rouven Dreyer1, and Georg Schmidt1 ,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle (Saale), Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Nanotechnikum Weinberg, 06120 Halle (Saale), Germany
Magnonics is a promising field to realize low energy information transmission and processing. It has been shown experimentally, that spin waves passing through a lateral thickness variation in a magnetic thin film obey snell's law [1]. So, a spatial change of the dispersion parameters like film thickness [2] or magnetic field can be used to deflect and focus a plane spin wave. We show that a magnetic field gradient can be induced using the demagnetizing field of a localized, lateral confinement inside an YIG film. Already a simple rectangular constriction can be used to create a spin wave interference pattern, which focuses the incident spin wave and remain stable when changing the external magnetic field or excitation frequency. It should be noted that the intensity at the focus is higher than at the position of the lens which was not observed in past experiments. The lens shape was first investigated using micromagnetic simulations with MuMax3. The fabricated lenses and their performance were characterized with spatially and time resolved magneto-optical Kerr microscopy (TR-MOKE) measurements.
[1] J. Stigloher et al., Phys. Rev. Lett. 117, 037204 (2016) [2] J. Toedt et al., Scientific Reports 6, 33169 (2016)