The weak dissipation of spin waves in magnetic materials make antiferromagnets realistic condensed matter systems for the experimental observation of intrinsic localized modes of nanoscale size. By employing a chirped high power microwave pulse, a few microseconds long, the lowest frequency antiferromagnetic uniform mode of the quasi-one-dimensional biaxial antiferromagnet (C2 H5 NH3 )2 CuCl4. has been efficiently driven into an unstable dynamical region. Intrinsic localized spin waves form below the gap. Our experimental findings demonstrate that a simple optimal control scheme can be used to investigate this kind of nonlinear excitation.

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English, L.Q., M. Sato, and A.J. Sievers. Nanoscale Intrinsic Localized Modes in an Antiferromagnetic Lattice. Journal of Applied Physics 89, no. 11 (2001): 6707-6709. http://aip.scitation.org/doi/abs/10.1063/1.1362639