THz-Scale Field-Induced Spin Dynamics in Ferrimagnetic Iron Garnets
T. G. H. Blank, K. A. Grishunin, E. A. Mashkovich, М. В. Логунов, А. К. Звездин, A. V. Kimel
Abstract
THz magnetization dynamics of antiferromagnetically coupled spins in ferrimagnetic Tm_{3}Fe_{5}O_{12} is excited by a picosecond single-cycle pulse of a magnetic field and probed with the help of the magneto-optical Faraday effect. Data analysis combined with numerical modeling shows that the dynamics corresponds to the exchange mode excited by the Zeeman interaction of the THz magnetic field with the spins. We argue that THz-pump-IR-probe experiments on ferrimagnets offer a unique tool for quantitative studies of dynamics and mechanisms to control antiferromagnetically coupled spins.
Topics & Concepts
FerrimagnetismSpinsZeeman effectCondensed matter physicsExcited stateTerahertz radiationPhysicsMagnetization dynamicsPicosecondMagnetizationMagnetic fieldField (mathematics)Faraday effectSpin (aerodynamics)Exchange interactionAtomic physicsOpticsFerromagnetismLaserQuantum mechanicsThermodynamicsMathematicsPure mathematicsMagneto-Optical Properties and ApplicationsPhotonic Crystals and ApplicationsTerahertz technology and applications