Chemical Structure from Scientific Research

Sketch of the crystal structure of the top layers and magnetization of the bulk ( M B ) and surface layer ( M S ). In the ferromagnetic ground state 26 , both M S and M B point in the same direction parallel to the c axis (left). When the direction of one of them (here M B ) is flipped (right), the exchange force results in an increase in the distance between the surface trilayer and the bulk (increase in the distance is exaggerated).

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