Abstract
The low-field surface nucleation and evolution of the inhomogeneous magnetic state in strongly coupled Fe/Gd ferrimagnetic multilayers is measured via grazing-incidence x-ray magnetic circular dichroism. At $T\ensuremath{\approx}0.7$ ${T}_{0},$ where ${T}_{0}\ensuremath{\sim}110\mathrm{K}$ is the ferrimagnetic compensation temperature, the inhomogeneous state nucleates at the surface. At nucleation, the surface state extends tens of interatomic distances into the bulk $(\ensuremath{\approx}200\mathrm{\AA{}}),$ a direct consequence of the strong interlayer coupling. At $T\ensuremath{\sim}{T}_{0},$ the inhomogeneous state penetrates throughout the bulk, while homogeneous magnetic states occur far below and above ${T}_{0}.$ Surface termination has a dramatic effect on the nature of the inhomogeneous state.
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