Nonlinear magnetization dynamics of antiferromagnetic spin resonance induced by intense terahertz magnetic field
Yu Mukai, Hideki Hirori, 山本 隆文, Takafumi Yamamoto, 陰山 洋, Hiroshi Kageyama, Kazuo Tanaka
Abstract
We report on the nonlinear magnetization dynamics of a HoFeO3 crystal induced by a strong terahertz magnetic field resonantly enhanced with a split ring resonator and measured with magneto-optical Kerr effect microscopy. The terahertz magnetic field induces a large change (∼40%) in the spontaneous magnetization. The frequency of the antiferromagnetic resonance decreases in proportion to the square of the magnetization change. A modified Landau-Lifshitz-Gilbert equation with a phenomenological nonlinear damping term quantitatively reproduced the nonlinear dynamics.
Topics & Concepts
PhysicsCondensed matter physicsMagnetizationMagnetization dynamicsTerahertz radiationAntiferromagnetismMagnetic fieldSpin waveField (mathematics)Resonance (particle physics)Kerr effectResonatorNonlinear systemFerromagnetismOpticsQuantum mechanicsPure mathematicsMathematicsTerahertz technology and applicationsMagnetic properties of thin filmsPhysics of Superconductivity and Magnetism