Symmetry Analysis of Second Harmonic Generation at Surfaces of Antiferromagnets

Details Symmetry Analysis of Second Harmonic Generation at Surfaces of Antiferromagnets Symmetry Analysis of Second Harmonic Generation at Surfaces of Antiferromagnets

1999-04-23

arxiv.org/abs/cond-mat/9904350v1

Physics

Condensed Matter

23 pages, 10 figures incorporated. Accepted to Phys. Rev. B, scheduled for July'99

Scientific paper

10.1103/PhysRevB.60.1144

Using group theory we classify the nonlinear magneto-optical response at low-index surfaces of fcc antiferromagnets, such as NiO. Structures consisting of one atomic layer are discussed in detail. We find that optical second harmonic generation is sensitive to surface antiferromagnetism in many cases. We discuss the influence of a second type of magnetic atoms, and also of a possible oxygen sublattice distortion on the output signal. Finally, our symmetry analysis yields the possibility of antiferromagnetic surface domain imaging even in the presence of magnetic unit-cell doubling.

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