title: Normal-Mode Splitting in the Coupled System of Hybridized Nuclear Magnons and Microwave Photons.
abstract: In the weak ferromagnetic MnCO_{3} system, a low-frequency collective spin excitation (magnon) is the hybridized oscillation of nuclear and electron spins coupled through the hyperfine interaction. By using a split-ring resonator, we performed transmission spectroscopy measurements of the MnCO_{3} system and observed avoided crossing between the hybridized nuclear magnon mode and the resonator mode in the NMR-frequency range. The splitting strength is quite large due to the large spin density of ^{55}Mn, and the cooperativity value C=0.2 (the magnon-photon coupling parameter) is close to the conditions of strong coupling. The results reveal a new class of spin systems, in which the coupling between nuclear spins and photons is mediated by electron spins via the hyperfine interaction.
authors.affiliation: Okinawa Institute of Science and Technology (OIST) Graduate University, Onna, Okinawa 904-0495, Japan.
authors.forename: L V
authors.initials: LV
authors.lastname: Abdurakhimov
authors.affiliation: Institute Neel, CNRS, Grenoble 30842, France.
authors.forename: Yu M
authors.initials: YM
authors.lastname: Bunkov
authors.affiliation: Okinawa Institute of Science and Technology (OIST) Graduate University, Onna, Okinawa 904-0495, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Konstantinov