text: Figure 2(a)-(c) shows the magnetic ﬁeld dependence of 
  XMCD asymmetry, deﬁned as (Il − Ir)/(Il + Ir) where 
  Il(r) is the absorption for left- (right-) circularly polarized 
  x-rays. This is measured at the Fe and Mn L3 absorption 
  peaks for a Fe(2 nm)/(Ga,Mn)As(10 nm) sample at 2 K. 
  The external ﬁeld is applied along the photon incidence 
  direction, which is at 70◦ to the surface normal with 
  an in-plane projection along the [110] axis. The XMCD 
  data show that the Fe ﬁlm displays a square hysteresis 
  loop with a single magnetization switch, as expected for 
  a monocrystalline Fe ﬁlm with strong uniaxial magnetic 
  anisotropy. The Mn XMCD shows a more complicated 
  loop due to the eﬀect of the interlayer coupling. The pro- 
  jected Mn moment aligns antiparallel to the Fe moment 
  at remanence, and undergoes a magnetization reversal of 
  opposite sign to the Fe. With further increase of the ex- 
  ternal magnetic ﬁeld, the Mn moment gradually rotates 
  away from antiparallel alignment with the Fe layer, and 
  into the ﬁeld direction. Qualitatively similar behavior 
  is observed for the Fe(2 nm)/(Ga,Mn)As(20 nm) sam- 
  ple: the (Ga,Mn)As layer is aligned antiparallel to the 
  Fe layer at zero ﬁeld, although the bias ﬁeld is lower by 
  approximately a factor of two. 