Abstract
The coexistence of the ferromagnetic and fan phases in a (001) MnP crystal, under a magnetic field applied along the b direction, is investigated in real time, by synchrotron radiation diffraction topography, at T ≈ 48 K. The ferromagnetic–fan interface includes bulk transition regions, elongated along a, and thick enough along the b direction (in the 10−4 m range) to produce a substantial contribution to diffraction. The Bragg condition changes continuously across these regions. This configuration, which involves magnetic charge distribution, is in sharp distinction with the usual two-dimensional character of magnetic walls and phase boundaries. The thick interface is likely to comprise a set of intermediate magnetic states.
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