Magnetic field dependence of antiferromagnetic resonance in NiO

Abstract

We report on measurements of magnetic field and temperature dependence of antiferromagnetic resonances in the prototypical antiferromagnet NiO. The frequencies of the magnetic resonances in the vicinity of 1 THz have been determined in the time-domain via time-resolved Faraday measurements after selective excitation by narrow-band superradiant terahertz (THz) pulses at temperatures down to 3K and in magnetic fields up to 10 T. The measurements reveal two antiferromagnetic resonance modes, which can be distinguished by their characteristic magnetic field dependencies. The nature of the two modes is discussed by comparison to an eight-sublattice antiferromagnetic model, which includes superexchange between the next-nearest-neighbor Ni spins, magnetic dipolar interactions, cubic magneto-crystalline anisotropy, and Zeeman interaction with the external magnetic field. Our study indicates that a two-sublattice model is insufficient for the description of spin dynamics in NiO, while the magnetic-dipolar interactions and magneto-crystalline anisotropy play important roles.

5 pages, 5 figures

References in corpus (3)

• Antiferromagnetic spintronics
• Electrical switching of an antiferromagnet
• THz electrical writing speed in an antiferromagnetic memory

Cited by in corpus (9)

• Gilbert damping phenomenology for two-sublattice magnets
• Principles of spintronic THz emitters
• Magnetic-Resonance-Induced Pseudo-electric Field and Giant Current Response in Axion Insulators
• Exchange-striction driven ultrafast nonthermal lattice dynamics in NiO
• Magnon decay theory of Gilbert damping in metallic antiferromagnets
• Ultrafast manipulation of the NiO antiferromagnetic order via sub-gap optical excitation
• Terahertz cavity magnon polaritons
• Polar magneto-optical Kerr effect in antiferromagnetic M${}_2$As (M=Cr, Mn, Fe) under an external magnetic field
• Strongly nonlinear antiferromagnetic dynamics in high magnetic fields