Magnon spin capacitor

PM Gunnink*, T Ludwig, RA Duine

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

In this work, we show that a magnon spin capacitor can be realized at a junction between two exchange coupled ferromagnets. In this junction, the buildup of magnon spin over the junction is coupled to the difference in magnon chemical potential, realizing the magnon spin analogue of an electrical capacitor. The relation between magnon spin and magnon chemical potential difference directly follows from considering the magnon density–density interaction between the two ferromagnets. We analyze the junction in detail by considering spin injection and detection from normal metal leads, the tunneling current across the junction, and magnon decay within the ferromagnet, showing that such a structure realizes a magnon spin capacitor in series with a spin resistor. Choosing yttrium iron garnet as the ferromagnet, we numerically calculate the magnon spin capacitance which ranges from picofarad to microfarad, depending on the area of the junction. We therefore conclude that the magnon spin capacitor could directly be of use in applications.
Original languageEnglish
Article number182404
Number of pages5
JournalApplied Physics Letters
Volume124
Issue number18
DOIs
Publication statusPublished - 29 Apr 2024

Fingerprint

Dive into the research topics of 'Magnon spin capacitor'. Together they form a unique fingerprint.

Cite this