1500-fold Tunneling Anisotropic Magnetoresistance in a (Ga,Mn)As stack
  We report the discovery of a super-giant tunneling anisotropic magnetoresistance in an epitaxially grown (Ga,Mn)As/GaAs/(Ga,Mn)As structure. The effect arises from a strong dependence of the electronic structure of ferromagnetic semiconductors on the magnetization orientation rather than from a parallel or antiparallel alignment of the contacts. The key novel spintronics features of this effect are: (i) both normal and inverted spin-valve like signals; (ii) a large non-hysteretic magnetoresistance for magnetic fields perpendicular to the interfaces; (iii) magnetization orientations for extremal resistance are, in general, not aligned with the magnetic easy and hard axis. (iv) Enormous amplification of the effect at low bias and temperatures. 
C. R\"uster, C. Gould, T. Jungwirth, J. Sinova, G.M. Schott, R.   Giraud, K. Brunner, G. Schmidt, and L.W. Molenkamp