Nonlinear magnetization dynamics of antiferromagnetic spin resonance induced by intense terahertz magnetic field
We report on the nonlinear magnetization dynamics of a HoFeO _3 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...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
IOP Publishing
2016-01-01
|
Series: | New Journal of Physics |
Subjects: | |
Online Access: | https://doi.org/10.1088/1367-2630/18/1/013045 |
Summary: | We report on the nonlinear magnetization dynamics of a HoFeO _3 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. |
---|---|
ISSN: | 1367-2630 |