Magnetic anisotropy and morphology of Co2FeAl films grown on sapphire surface and microstructures made from them

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Thin films of Co2FeAl Heusler alloy were fabricated on R- and A-plane Al2O3 substrates with and without Mo seed layer. As the film growth temperature increases, the coercive field and the sharpness of the peaks on the magnetoresistance curve first increase rapidly and then sharply decrease, indicating structural changes in the films. Films grown on A-plane exhibit uniaxial magnetic anisotropy and those grown on R-plane – biaxial one. Patterns of domains being consistent with the magnetic anisotropy found in magnetoresistive experiments were observed using magnetic force microscopy on strips made of the films.