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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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THz-Scale Field-Induced Spin Dynamics in Ferrimagnetic Iron Garnets
T G H Blank1, K A Grishunin1,2, E A Mashkovich1,3
1Radboud University, Institute for Molecules and Materials, 6525 AJ Nijmegen, The Netherlands.
Physical Review Letters
|July 30, 2021
Summary
Researchers studied terahertz (THz) magnetization dynamics in ferrimagnetic Tm3Fe5O12 using THz magnetic fields. They observed an exchange mode excited by Zeeman interaction, offering insights into controlling antiferromagnetically coupled spins.
Area of Science:
- Condensed Matter Physics
- Magnetism and Spintronics
- Ultrafast Phenomena
Background:
- Understanding and controlling spin dynamics in magnetic materials is crucial for next-generation electronic devices.
- Ferrimagnetic materials, with their complex magnetic ordering, present unique opportunities for advanced spintronic applications.
- Antiferromagnetic coupling within spins influences their dynamic behavior and response to external stimuli.
Purpose of the Study:
- To investigate the terahertz (THz) magnetization dynamics in ferrimagnetic Tm3Fe5O12.
- To identify the specific spin dynamics modes excited by ultrafast THz magnetic fields.
- To explore the potential of THz-pump-IR-probe spectroscopy for studying and controlling spin dynamics.
Main Methods:
- Excitation of magnetization dynamics using a picosecond single-cycle pulse of a magnetic field in the THz range.
- Probing the dynamics via the magneto-optical Faraday effect.
- Combining experimental data analysis with numerical modeling for interpretation.
Main Results:
- Observed THz magnetization dynamics in Tm3Fe5O12.
- Identified the dynamics as an exchange mode driven by the Zeeman interaction of the THz magnetic field with spins.
- Demonstrated the effectiveness of the THz-pump-IR-probe technique for analyzing spin behavior.
Conclusions:
- THz-pump-IR-probe experiments provide a powerful method for quantitative studies of spin dynamics in ferrimagnets.
- The study elucidates the mechanisms controlling antiferromagnetically coupled spins at THz frequencies.
- This research opens avenues for precise control over spin dynamics in magnetic materials.
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