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Neutron scattering experiments continue to improve our knowledge of spinfluctuations in layered cuprates, excitations that are symptomatic of theelectronic correlations underlying high-temperature superconductivity.Time-of-flight spectrometers, together with new and varied single crystalsamples, have provided a more complete characterization of the magnetic energyspectrum and its variation with carrier concentration. While the spinexcitations appear anomalous in comparison with simple model systems, there isclear consistency among a variety of cuprate families. Focusing initially onhole-doped systems, we review the nature of the magnetic spectrum, andvariations in magnetic spectral weight with doping. We consider connectionswith the phenomena of charge and spin stripe order, and the potentialgenerality of such correlations as suggested by studies of magnetic-field andimpurity induced order. We contrast the behavior of the hole-doped systems withthe trends found in the electron-doped superconductors. Returning to hole-dopedcuprates, studies of translation-symmetry-preserving magnetic order arediscussed, along with efforts to explore new systems. We conclude with adiscussion of future challenges.

Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates