1. MOKE Results 137

2. Magnetic properties of CoMnGe ternary alloys Co 0.00.20.40.60.81.0 Ge 0.0 0.2 0.4 0.6 0.8 1.0 Mn 0.0 0.2 0.4 0.6 0.8 1.0 Exhibits room temperature ferromagnetism in this entire composition range Shows a ridge of higher MOKE intensity  Related to the structural perfection ridge

3. Magnetic anisotropy: points on the ridge 5 th Point, Composition,=X, Y Six-fold (0  ) +Uniaxial (30  ) magnetic anisotropy 12 th Point, Composition,=X, Y

4. 20th Point, Composition,=X, Y Magnetic anisotropy 26th Point, Composition,=X, Y

5. Model for Magnetic anisotropy Magneto-crystalline anisotropy Anisotropic energy in cubic crystals Demagnetization energy 0 MM M Additional term for the observed Uniaxial magnetic anisotropy

6. Asymmetric magneto-optic response Second-order terms -Contains transverse component of magnetization Where θ, is angle between M and H Due to the terms in the dielectric tensor second order in the magnetization The second-order term becomes the only important term in the case of perpendicular incidence! Osgood et al., Phys. Rev. B 53 8990 (1997) a, b depend on the optic geometry (polarization angle of the incident laser, analyzer angle and incident angle) and the dielectric tensor of the material

7. Model comparison r = 0.1 5 th Point, Composition,=X, Y

8. Model comparison 20th Point, Composition,=X, Y

9. On the ridge 20th Point, Composition,=X, Y12 th Point, Composition,=X, Y 15 th Point, Stoichiometric

10. 5 th Line comparison in transverse direction 2 nd on 5th 16th on 5th Intersection isotropic Uniaxial ratio-negative

11. 12 th Line comparison in transverse direction 2 nd on 12th16th on 12thIntersection Uniaxial ratio-negativeisotropic

12. 12 th line comparison in transverse direction 2 nd on 5th6 th on 5th Intersection Uniaxial ratio-negative Uniaxial ratio-positive

13. 20 th line comparison in transverse direction 2 nd on 20th 16th on 20th Intersection Uniaxial ratio-negative