Abstract
Abstract
We investigated the coherently excited propagating magnons in in-plane magnetized synthetic antiferromagnets using heterodyne-magneto-optical Kerr effect technique. Under the in-plane magnetic field to 45° away from the magnon propagation direction, we observed the mode splitting of magnon dispersion relation due to the magnon–magnon coupling between acoustic and optical magnon modes. The strong coupling with a cooperativity of 8.4 ± 1.3 is achieved for finite wavenumber. These results provide a deep understanding of the properties of coherently excited magnons in synthetic antiferromagnets, which will be helpful for designing advanced magnonic devices.
Funder
the Collaborative Research Program of the Institute for Chemical Research, Kyoto University
Japan Science and Technology Agency
Ministry of Education, Culture, Sports, Science and Technology
Japan Society for the Promotion of Science, KAKENHI
Subject
General Physics and Astronomy,General Engineering