THz-driven magnetism goes nonlinear

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Science  25 Nov 2016:
Vol. 354, Issue 6315, pp. 1017-1018
DOI: 10.1126/science.354.6315.1017-e

Manipulation of magnetism in solids by terahertz (THz) radiation may enable applications in information storage and processing. Experiments so far have explored a regime in which the magneto-optical response is linear, but entering the nonlinear regime is important for applications. Baierl et al. achieved this goal in the antiferromagnetic compound NiO. The magnetic field of the THz radiation that they shone on the sample coupled to the spins in the material, causing them to precess. In addition to a dominant and expected frequency of 1THz, a peak appeared at double that frequency, signifying a nonlinear response. The advance may enable progress toward magnetic THz spin-switching.

Phys. Rev. Lett. 117, 197201 (2016).

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