Dynamic spin reorientation in orthoferrites irradiated by a laser pulse

Temperature tunable oscillator of THz-frequency signals based on the orthoferrite/heavy metal heterostructure

“…where α = 10 3 is the Gilbert damping constant [24], ω ex = 2π • 44.8 THz is the frequency corresponding to the exchange interaction between AFM sublattices, ω e = 2π • 0.137 GHz is the frequency corresponding to the anisotropy in the basic plane [25], j is the DC electric current density flowing through the Pt layer, σ = 2π•4.32 × 10 −4 Hz•m 2 A −1 is the torquecurrent proportionality constant [6], w(φ) is the magnetic anisotropy energy for θ = const:…”

Photoinduced dynamics and femtosecond excitation of phonon modes in ferroelectric semiconductor Sn2P2S6

“…Soon after the first experiments on ultrafast demagnetization, it was found that light can induce spin oscillations at the magnetic-resonance frequency [6][7][8]. Although the amplitude of the oscillations observed in these experiments did not exceed a few degrees, it has been demonstrated in recent years that they can be noticeably enhanced in the vicinity of a phase transition if they match the soft mode corresponding to the transition [9]. Finally, it was shown that femtosecond laser excitation may cause the reorientation of spins by 90° [ 10] and even 180° [11].…”

Optical second harmonic generation and its photoinduced dynamics in ferroelectric semiconductor Sn2P2S6

“…After that, the possibility of light excitation of spin oscillations at the magnetic-resonance frequency was demonstrated [2][3][4]. Although initially the amplitudes of these oscillations did not exceed a few degrees, it has been demonstrated later on that, in the vicinity of a phase transition, these oscillations can be enhanced noticeably [5]. The authors of [6] and [7] demonstrated the possibility of reorientation of spins under the action of a femtosecond laser pulse by 90°a nd 180°, correspondingly.…”