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Spin Oscillations in Antiferromagnetic NiO Triggered by Circularly Polarized Light

2010; American Physical Society; Volume: 105; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.105.077402

1092-0145

Takuya Satoh, Sung‐Jin Cho, Ryugo Iida, Tsutomu Shimura, Kazuo Kuroda, Hiroaki Ueda, Yutaka Ueda, B. A. Ivanov, Franco Nori, M. Fiebig,

Transition Metal Oxide Nanomaterials

Coherent spin oscillations were nonthermally induced by circularly polarized pulses in the fully compensated antiferromagnet NiO. This effect is attributed to the action of the effective magnetic field generated by an inverse Faraday effect on the spins. The novelty of this mechanism is that spin oscillations are driven by the time derivative of the effective magnetic field which acts even on "pure" antiferromagnets with zero net magnetic moment in the ground state. The measured frequencies (1.07 THz and 140 GHz) correspond to the out-of-plane and in-plane modes of antiferromagnetic spin oscillations.