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Fast broadband cluster spin-glass dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>PbFe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Nb</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
$\mathrm{Pb}{\mathrm{Fe}}_{1/2}{\mathrm{Nb}}_{1/2}{\mathrm{O}}_{3}$ (PFN) is a relaxor ferroelectric (${T}_{c}\ensuremath{\sim}400\phantom{\rule{0.16em}{0ex}}\mathrm{K}$) consisting of magnetic ${\mathrm{Fe}}^{3+}$ ($S=\frac{5}{2}, L\ensuremath{\approx}0$) ions disordered throughout the lattice and hosts a spin-glass phase at low temperatures built from spatially isolated clusters of ${\mathrm{Fe}}^{3+}$ ions, termed a ``cluster glass'' [Kleemann et al., Phys. Rev. Lett. 105, 257202 (2010)]. We apply neutron …