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Néel Spin-Orbit Torque Driven Antiferromagnetic Resonance in Mn2Au Probed by Time-Domain THz Spectroscopy


(SPIN+X) Bhatacharjee, Nilabha; Bodnar, Stanislav; Grigorev, Vladimir; Agustsson, Steinn Ymir; Cao, Jingming; Dominko, Damir; Obergfell, Manuel; Gomonay, Olenka; Sinova, Jairo; Kläui, Matthias et al.
Néel Spin-Orbit Torque Driven Antiferromagnetic Resonance in Mn2Au Probed by Time-Domain THz Spectroscopy // Physical review letters, 120 (2018), 23; 237201-1 doi:10.1103/PhysRevLett.120.237201 (međunarodna recenzija, članak, znanstveni)


Naslov
Néel Spin-Orbit Torque Driven Antiferromagnetic Resonance in Mn2Au Probed by Time-Domain THz Spectroscopy

Autori
Bhatacharjee, Nilabha ; Bodnar, Stanislav ; Grigorev, Vladimir ; Agustsson, Steinn Ymir ; Cao, Jingming ; Dominko, Damir ; Obergfell, Manuel ; Gomonay, Olenka ; Sinova, Jairo ; Kläui, Matthias ; Elmers, Hajo ; Jourdan, Martin ; Demsar, Jure

Kolaboracija
SPIN+X

Izvornik
Physical review letters (0031-9007) 120 (2018), 23; 237201-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
THz spectroscopy, antiferromagnetic resonance, spin-orbit torque

Sažetak
We observe the excitation of collective modes in the terahertz (THz) range driven by the recently discovered N´eel spin-orbit torques (NSOTs) in the metallic antiferromagnet Mn2Au. Temperaturedependent THz spectroscopy reveals a strong absorption mode centered near 1 THz, which upon heating from 4 to 450 K softens and loses intensity. A comparison with the estimated eigenmode frequencies implies that the observed mode is an in-plane antiferromagnetic resonance (AFMR). The AFMRabsorption strength exceeds those found in antiferromagnetic insulators, driven by the magnetic field of the THz radiation, by 3 orders of magnitude. Based on this and the agreement with our theory modeling, we infer that the driving mechanism for the observed mode is the current-induced NSOT. Here the electric field component of the THz pulse drives an ac current in the metal, which subsequently drives the AFMR. This electric manipulation of the N´eel order parameter at high frequencies makes Mn2Au a prime candidate for antiferromagnetic ultrafast memory applications.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove
Institut za fiziku, Zagreb

Autor s matičnim brojem:
Damir Dominko, (285600)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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