[18a-WL2_301-1~10] 3.8 Terahertz technologies

10:30 AM - 11:00 AM JST(1:30 AM - 2:00 AM UTC)

[18a-WL2_301-6] [The 47th Paper Award Speech] Ultrafast Spin Switching Driven by THz High Magnetic Fields in Spiral Resonators

〇Kei Maruyama¹, Zhenya Zhang¹, Miharu Takumi², Takuya Satoh², Makoto Nakajima³, Yoshihiko Kanemitsu¹, Hideki Hirori¹ (1.Kyoto Univ., 2.Tokyo Tech, 3.Osaka Univ.)

Keywords:

terahertz,Optical properties,spin

Light-matter interaction is known as one of the means to realize nonequilibrium properties. We conducted research aimed at inducing nonequilibrium spin dynamics using a strong terahertz (THz) optical magnetic field. By irradiating a microstructured metallic device called a spiral antenna resonator (SAR) with THz radiation, we observed the generation of a THz optical magnetic field of up to 0.96 T. Furthermore, we successfully induced ultrafast spin switching in the antiferromagnet Sm_0.7Er_0.3FeO₃ through the SAR magnetic field.