Molecular Beam Epitaxy grown (Ga,Mn)(As,P) with perpendicular to plane   magnetic easy axis
  We present an experimental investigation of the magnetic, electrical and structural properties of Ga0.94Mn0.06As1-yPy layers grown by molecular beam epitaxy on GaAs substrates for y less than or equal to 0.3. X-ray diffraction measurements reveal that the layers are under tensile strain which gives rise to a magnetic easy axis perpendicular to the plane of the layers. The strength of the magnetic anisotropy and the coercive field increase as the phosphorous concentration is increased. The resistivity of all samples shows metallic behaviour with the resistivity increasing as y increases. These materials will be useful for studies of micromagnetic phenomena requiring metallic ferromagnetic material with perpendicular magnetic anisotropy. 
A W Rushforth, M Wang, N R S Farley, R C Campion, K W Edmonds, C R   Staddon, C T Foxon, and B L Gallagher