Multiferroic materials, characterized by the existence of coupled magnetic and electric orders, offer a rich platform for studying magnetoelectric excitations such as electromagnons. In this study, we have investigated the electromagnon excitations in ${\mathrm{GdMn}}_2{\mathrm{O}}_5$, a rare-earth manganite known for its strong magnetoelectric effects. Using terahertz time-domain spectroscopy performed under an external magnetic field up to 7 T, we identified an electromagnon at $36\mathrm{c}{\mathrm{m}}^{-1}$ (4.5 meV) that emerges below the commensurate magnetic ordering temperature $(T_{\mathrm{N}2}\approx 33\mathrm{K})$. Our results show that the electromagnon in ${\mathrm{GdMn}}_2{\mathrm{O}}_5$ is highly sensitive to the spin configurations of Gd and Mn, which are strongly influenced by the Gd-Mn exchange interaction. The observed hysteresis in the electromagnon spectrum, corresponding to the magnetic hysteresis, further indicates a strong coupling between magnetic and electric orders in this material.

Close

PrevNext

View figure in article

• Magnetic interactions
• Magnetic phase transitions
• Magneto-dielectric effect
• Magnons
• Terahertz spectroscopy
• Time-resolved infrared spectroscopy