Tailoring THz antiferromagnetic resonance of NiO by cation substitution

Antiferromagnets generally have a quite high magnetic resonance, as known as the antiferromagnetic resonance, whose frequency goes up to the THz range. They are one of the few materials that can magnetically couple to THz electromagnetic waves and are therefore important materials for THz technologies. In this work, we demonstrate that the THz resonance properties, such as resonant frequency and the Q factor, of antiferromagnetic NiO can be controlled over a wide range by substituting the Ni2+ cation with various different cations. Our discussion extends to the trends of how different substitute cations Mn2+, Li+, and Mg2+ impact the resonant properties, which suggests a guideline for designing antiferromagnetic THz materials.