Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 29: Caloric Effects in Magnetic Materials

MA 29.5: Talk

Thursday, September 8, 2022, 10:30–10:45, H47

Magnonic to electronic spin current conversion in a quantum dot hybrid system with magnetic insulator — •Emil Siuda and Piotr Trocha — Faculty of Physics, Institute of Spintronics and Quantum Information, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland

One of the challenges of further miniaturization of electronic components is managing heat generated due to the Joule heating and other effects. While magnonics offers a way to reduce generation of the waste heat in the device it is still impossible to get rid of it entirely. Hence a way of converting heat to useful electric power is desirable.

We investigate a hybrid system which utilizes a temperature gradient to produce a magnon current and converts it to a spin electronic current. The considered system consists of a quantum dot coupled to the two ferromagnetic insulators or one ferromagnetic insulator and one ferromagnetic metal. This work focuses on the influence of energy-dependent density of states and many-body magnon interactions in the magnonic reservoirson the thermally induced spin transport through the system. Energy-dependent density of states is crucial for boson-like particles, especially in the low energy limit where the lowest momentum states dominate the tranport. Thus, in the present work we consider explicit energy dependence of the density of states for the magnonic reservoirs. Moreover, taking into account many-body magnon interactions leads to a temperature-dependent density of states of magnons which results in temperature-dependent couplings of the dot to the magnonic reservoirs.