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Micromagnetic simulation of THz signals in antiferromagnetic FeRh by sub-picosecond thermal pulses
- Source :
- AIP Advances, Vol 9, Iss 3, Pp 035040-035040-5 (2019)
- Publication Year :
- 2019
- Publisher :
- AIP Publishing LLC, 2019.
-
Abstract
- The generation of electrical field signals in the terahertz frequency (THz) range has gained increasing attention in recent years. The use of antiferromagnets (AFM) has been proposed as a possible alternative to generate high frequency signals using spin transfer torque (STT) induced damping compensation. In this work, we simulated a potential mechanism for laser-induced THz signals in the AFM phase of FeRh/Pt bilayer films using micromagnetic model. The FeRh film is modeled as two Fe-sublattices coupled via intra-lattice exchange field, and subjected to a sub-picosecond thermal pulse. A partial canting between the magnetizations of two Fe-sublattices, is observed within the first picosecond after the excitation. This short lived state relaxes abruptly into the initial AFM phase, injecting a spin current into the Pt layer via spin pumping, which will eventually be converted into charge current oscillating at THz frequency.
- Subjects :
- 010302 applied physics
Spin pumping
Materials science
Condensed matter physics
Terahertz radiation
Spin-transfer torque
General Physics and Astronomy
Physics::Optics
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
lcsh:QC1-999
Magnetization
chemistry.chemical_compound
chemistry
Picosecond
0103 physical sciences
Condensed Matter::Strongly Correlated Electrons
0210 nano-technology
Micromagnetics
Excitation
AFm phase
lcsh:Physics
Subjects
Details
- Language :
- English
- ISSN :
- 21583226
- Volume :
- 9
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- AIP Advances
- Accession number :
- edsair.doi.dedup.....62b76bbf0bf6f092506b84220e0df8f7