William T. Coffey and Yuri P. Kalmykov, J. Appl. Phys. 112, 121301 (2012)

Uniaxial anisotropy

hexagonal close-packed (hcp)

https://en.wikipedia.org/wiki/Close-packing_of_equal_spheres

(15th November 2017)

Uniaxial anisotropy energy plot

William T. Coffey and Yuri P. Kalmykov, J. Appl. Phys. 112, 121301 (2012)

Cubic anisotropy