Zero-Field NMR inCuMn: New Viewpoint on Remanence in Spin-Glasses

Zero-field Cu NMR of the first and fourth nearest neighbors of Mn in spin-glass Cu-Mn(1%) have been detected for $T\lesssim \frac{T_g}{5}$. The observed enhancement of rf field and signal intensity, associated with domain rotation, increases with the remanent magnetization and vanishes if the sample is zero-field cooled. A new description of the remanent properties of spin-glasses with no independent magnetic domains after zero-field cooling is proposed.