Spectroscopy of spontaneous spin noise as a probe of spin dynamics and magnetic resonance

@article{Crooker2004SpectroscopyOS,
  title={Spectroscopy of spontaneous spin noise as a probe of spin dynamics and magnetic resonance},
  author={Scott A. Crooker and Dwight G. Rickel and Alexander V. Balatsky and D. L. Smith},
  journal={Nature},
  year={2004},
  volume={431},
  pages={49-52}
}
Not all noise in experimental measurements is unwelcome. Certain fundamental noise sources contain valuable information about the system itself—a notable example being the inherent voltage fluctuations (Johnson noise) that exist across any resistor, which allow the temperature to be determined. In magnetic systems, fundamental noise can exist in the form of random spin fluctuations. For example, statistical fluctuations of N paramagnetic spins should generate measurable noise of order N spins… 
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