Excitation and Detection of THz Coherent Spin Waves in Antiferromagnetic $\alpha -\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$

Abstract

The efficiency of ultrafast excitation of spins in antiferromagnetic $\alpha -\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$ using nearly single-cycle THz pulse is studied as a function of the polarization of the THz pulse and the sample temperature. Above the Morin point the most efficient excitation is achieved when the magnetic field of the THz pulse is perpendicular to the antiferromagnetically coupled spins. Using the experimental results and equations of motion for spins, we show that the mechanism of the spin excitation above and below the Morin point relies on magnetic-dipole interaction of the THz magnetic field with spins and the efficiency of the coupling is proportional to the time derivative of the magnetic field.

References in corpus (7)

• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Spin Oscillations in Antiferromagnetic NiO Triggered by Circularly Polarized Light
• Temporal and spectral fingerprints of ultrafast all-coherent spin switching
• Inverse magneto-refraction as a mechanism for laser modification of spin-spin exchange parameters and subsequent terahertz emission from iron oxides
• Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
• Ultrafast and Energy-Efficient Quenching of Spin Order: Antiferromagnetism Beats Ferromagnetism

Cited by in corpus (7)

• Terahertz field-driven magnon upconversion in an antiferromagnet
• Nonlinear terahertz Néel spin-orbit torques in antiferromagnetic Mn${}_2$Au
• Cavity magnon-polaritons in cuprate parent compounds
• Empowering Control of Antiferromagnets by THz-induced Spin Coherence
• Antiferromagnetic resonance in $\alpha$-Fe${}_2$O${}_3$ up to its Néel temperature
• Coherent Spin Pumping Originated from Sub-Terahertz Néel Vector Dynamics in Easy Plane α-Fe2O3/Pt
• Nonlinear spin-Wave Doppler effect for flexible tuning of magnonic frequencies