Precession of a particle with anomalous magnetic moment in   electromagnetic and gravitational pp-wave fields
  We present an exact solution of the Bargmann-Michel-Telegdi (BMT) equations for the dynamics of a spin particle in external electromagnetic and gravitational pp-wave fields. We demonstrate that an anomalous magnetic moment gives rise to an additional spin rotation which is modulated both by the electromagnetic and by the gravitational wave periodicities. 
Alexander Balakin, Veronika Kurbanova, Winfried Zimdahl