Magnetic Properties and THz Emission from Co/CoO/Pt and Ni/NiO/Pt Trilayers
Nikolaos Kanistras1, Laura Scheuer2, Dimitrios I Anyfantis3
1Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann Platz 3, 06120 Halle, Germany.
Nanomaterials (Basel, Switzerland)
|January 26, 2024
Summary
Antiferromagnetic interlayers in Co/CoO/Pt and Ni/NiO/Pt trilayers enhance terahertz (THz) emission. The NiO interlayer effectively transports ultrafast spin current, offering potential for THz technology applications.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Terahertz (THz) Science
Background:
- Terahertz (THz) radiation emission from ferromagnetic/non-magnetic bilayers is a rapidly developing area in ultrafast spin physics.
- Antiferromagnetic materials are increasingly investigated for their role in THz emission and spin current transport.
Purpose of the Study:
- To fabricate and investigate Co/CoO/Pt and Ni/NiO/Pt trilayers.
- To study the magnetic properties and the role of ultrathin antiferromagnetic interlayers (NiO, CoO) in ultrafast spin current transport.
- To probe the influence of these interlayers on THz emission.
Main Methods:
- Temperature-dependent SQUID magnetometry for static magnetic properties.
- Ferromagnetic resonance spectroscopy for dynamic magnetic properties.
- Terahertz (THz) time-domain spectroscopy for THz emission analysis.
Main Results:
- Fabricated Co/CoO/Pt and Ni/NiO/Pt trilayers exhibited significant exchange bias.
- Enhanced magnetic damping values were observed in the trilayer structures.
- THz emission measurements indicated that the NiO interlayer facilitates ultrafast spin current transport.
Conclusions:
- Ultrathin antiferromagnetic interlayers, particularly NiO, play a crucial role in mediating ultrafast spin current transport.
- These findings highlight the potential of engineered antiferromagnetic/ferromagnetic heterostructures for advanced THz emission applications.
Related Concept Videos
03:02Colors and Magnetism
11.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.7K
02:42Valence Bond Theory
8.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.6K