Abstract
In recent years terahertz (THz) technology has been an emerging research field with a broad range of applications. THz radiation falls between the infrared and microwave radiation in the electromagnetic spectrum. Most THz sources to date are not related to the spin degree of freedom; however, recent research efforts in spintronics and ferromagnetism demonstrated that the electron spin offers completely new opportunities for the generation of ultrafast photocurrents. For instance, magnetic heterostructures are very easy to pattern and potentially allow to tailor THz emission characteristics by design. Here, we demonstrate that an ultrafast spin-current pulse driven by a femtosecond laser pulse can create THz transients in microstructured magnetic heterostructures due to the inverse spin Hall effect. We compare the THz electric field and the THz spectrum of a control CoFeBPt film with microstructured CoFeBPt wires as well as microstructured CoFeBMgO wires patterned on an extended Pt film. We find that the THz electric field amplitude is proportional to the coverage of the CoFeBPt heterostructure on top of the MgO substrate. Furthermore, we analyze the magnetization direction dependence of the THz transients with respect to the easy axis of the ferromagnetic wire. The presented results are the first steps towards shaping and controlling the THz properties by microstructuring of spintronics-based THz emitters.
| Original language | English |
|---|---|
| Title of host publication | Spintronics XII |
| Editors | Henri-Jean M. Drouhin, Jean-Eric Wegrowe, Manijeh Razeghi, Henri Jaffres |
| Publisher | SPIE |
| ISBN (Electronic) | 9781510628731 |
| DOIs | |
| Publication status | Published - Jan 1 2019 |
| Event | Spintronics XII 2019 - San Diego, United States Duration: Aug 11 2019 → Aug 15 2019 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 11090 |
| ISSN (Print) | 0277-786X |
| ISSN (Electronic) | 1996-756X |
Conference
| Conference | Spintronics XII 2019 |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 8/11/19 → 8/15/19 |
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Keywords
- Magnetic microstructure
- Spin Hall effect
- Spintronics
- Terahertz spintronics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
Terahertz emission from magnetic thin film and patterned heterostructures. / Lendinez, Sergi; Li, Yi; Wu, Weipeng; Taghipour Kaffash, Mojtaba; Zhang, Qi; Zhang, Wei; Pearson, John E.; Divan, Ralu; Schaller, Richard D.; Hoffmann, Axel; Wen, Haidan; Jungfleisch, Matthias Benjamin.
Spintronics XII. ed. / Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffres. SPIE, 2019. 1109013 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11090).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Terahertz emission from magnetic thin film and patterned heterostructures
AU - Lendinez, Sergi
AU - Li, Yi
AU - Wu, Weipeng
AU - Taghipour Kaffash, Mojtaba
AU - Zhang, Qi
AU - Zhang, Wei
AU - Pearson, John E.
AU - Divan, Ralu
AU - Schaller, Richard D.
AU - Hoffmann, Axel
AU - Wen, Haidan
AU - Jungfleisch, Matthias Benjamin
PY - 2019/1/1
Y1 - 2019/1/1
N2 - In recent years terahertz (THz) technology has been an emerging research field with a broad range of applications. THz radiation falls between the infrared and microwave radiation in the electromagnetic spectrum. Most THz sources to date are not related to the spin degree of freedom; however, recent research efforts in spintronics and ferromagnetism demonstrated that the electron spin offers completely new opportunities for the generation of ultrafast photocurrents. For instance, magnetic heterostructures are very easy to pattern and potentially allow to tailor THz emission characteristics by design. Here, we demonstrate that an ultrafast spin-current pulse driven by a femtosecond laser pulse can create THz transients in microstructured magnetic heterostructures due to the inverse spin Hall effect. We compare the THz electric field and the THz spectrum of a control CoFeBPt film with microstructured CoFeBPt wires as well as microstructured CoFeBMgO wires patterned on an extended Pt film. We find that the THz electric field amplitude is proportional to the coverage of the CoFeBPt heterostructure on top of the MgO substrate. Furthermore, we analyze the magnetization direction dependence of the THz transients with respect to the easy axis of the ferromagnetic wire. The presented results are the first steps towards shaping and controlling the THz properties by microstructuring of spintronics-based THz emitters.
AB - In recent years terahertz (THz) technology has been an emerging research field with a broad range of applications. THz radiation falls between the infrared and microwave radiation in the electromagnetic spectrum. Most THz sources to date are not related to the spin degree of freedom; however, recent research efforts in spintronics and ferromagnetism demonstrated that the electron spin offers completely new opportunities for the generation of ultrafast photocurrents. For instance, magnetic heterostructures are very easy to pattern and potentially allow to tailor THz emission characteristics by design. Here, we demonstrate that an ultrafast spin-current pulse driven by a femtosecond laser pulse can create THz transients in microstructured magnetic heterostructures due to the inverse spin Hall effect. We compare the THz electric field and the THz spectrum of a control CoFeBPt film with microstructured CoFeBPt wires as well as microstructured CoFeBMgO wires patterned on an extended Pt film. We find that the THz electric field amplitude is proportional to the coverage of the CoFeBPt heterostructure on top of the MgO substrate. Furthermore, we analyze the magnetization direction dependence of the THz transients with respect to the easy axis of the ferromagnetic wire. The presented results are the first steps towards shaping and controlling the THz properties by microstructuring of spintronics-based THz emitters.
KW - Magnetic microstructure
KW - Spin Hall effect
KW - Spintronics
KW - Terahertz spintronics
UR - http://www.scopus.com/inward/record.url?scp=85073211690&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073211690&partnerID=8YFLogxK
U2 - 10.1117/12.2526194
DO - 10.1117/12.2526194
M3 - Conference contribution
AN - SCOPUS:85073211690
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Spintronics XII
A2 - Drouhin, Henri-Jean M.
A2 - Wegrowe, Jean-Eric
A2 - Razeghi, Manijeh
A2 - Jaffres, Henri
PB - SPIE
ER -