Tetragonal L10 FePt films are deposited on the pyramid-type Si substrates fabricated by chemical etching process from (100) Si wafers. The films are composed of different easy-axis orientation FePt grains, most of which with the easy axis along substrate normal, the others with the easy axis tilted from the normal direction. When the magnetic field is applied along the perpendicular direction, the easy-axis tilted grains reverse first, and then the magnetization reversal of the whole film is promoted. Small coercivity, suitable α, and high squareness are obtained. And the coercivity increases when the applied field is tilted from the normal direction.
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (Nos. 60490290 and 10374019), and grants from the Shanghai Commission of Science and Technology (Grant Nos. 05PJ14016 and 04D214001) and State Ministry of Education. The authors acknowledge the helpful discussion with Shiming Zhou from the Department of Physics.