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We investigate the imaginary part of the wave vector dependent dynamic spinsusceptibility in Sr$_2$(Ru$_{0.99}$Ti$_{0.01}$)O$_4$ as a function oftemperature using neutron scattering. At T=5 K, two-dimensional incommensurate(IC) magnetic fluctuations are clearly observed around$\mathbf{Q}_\text{c}=(0.3,0.3,L)$ up to approximately 60 meV energy transfer.We find that the IC excitations disperse to ridges around the $(\pi,\pi)$point. Below 50 K, the energy and temperature dependent excitations are welldescribed by the phenomenological response function for a Fermi liquid systemwith a characteristic energy of 4.0(1) meV. Although the wave vector dependenceof the IC magnetic fluctuations in Sr$_2$(Ru$_{0.99}$Ti$_{0.01}$)O$_4$ issimilar to that in the Fermi liquid state of the parent compound,Sr$_2$RuO$_4$, the magnetic fluctuations are clearly suppressed by theTi-doping.

Two-dimensional incommensurate magnetic fluctuations in Sr$_2$(Ru$_{0.99}$Ti$_{0.01}$)O$_4$