Ultrafast Spin Dynamics in the Iron Borate Easy-Plane Weak Ferromagnet

Ultrafast processes of the spin dynamics in iron borate FeBO 3 are considered theoretically; the mechanisms responsible for excitation of quasi-ferromagnetic as well as quasi-antiferromagnetic spin resonance modes by a one-period terahertz pulse are indicated. In full agreement with experimental obs...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2020-07, Vol.131 (1), p.130-138
Main Authors: Zvezdin, A. K., Kimel, A. V., Plokhov, D. I., Zvezdin, K. A.
Format: Article
Language:English
Subjects:
Amplitudes
Antiferromagnetism
Borates
Classical and Quantum Gravitation
Electric fields
Elementary Particles
Excitation
Ferromagnetic resonance
Ferromagnetism
Iron
Linear functions
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quadratic equations
Quantum Field Theory
Relativity Theory
Solid State Physics
Spin dynamics
Spin resonance
Terahertz frequencies
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Summary:Ultrafast processes of the spin dynamics in iron borate FeBO 3 are considered theoretically; the mechanisms responsible for excitation of quasi-ferromagnetic as well as quasi-antiferromagnetic spin resonance modes by a one-period terahertz pulse are indicated. In full agreement with experimental observations [27], the excitation of the high-frequency quasi-antiferromagnetic mode is resonant by nature, and its amplitude is a linear function of the electric field of the terahertz pulse. The amplitude of the low-frequency quasi-ferromagnetic mode is a quadratic function of the electric field of the pulse, and the excitation of this mode is governed by the mechanism of the inverse Cotton–Mouton effect.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776120070195