Abstract
SmDyCo/Cr films have been prepared by an r.f magnetron sputtering system. The Cr underlayer was found to play an important role in increasing the coercivity (Hc) in the DyCo films because of the formation of granular structure. The effects of Dy substituted by Sm on the magnetic and magneto-optical properties of DyCo/Cr films have been investigated. By analyzing the figure of Ms*Hc vs. Sm concentration, optimum Sm concentration should be found between 16-22 at% to obtain maximum Ms*Hc. With increasing Sm concentration, the Ms is steadily increased, while the He is slightly decreased. With the increasing of Sm concentration, the reflectivity (R) and Kerr rotation angle (θAk) are increased. It is believed that by choosing optimal sputtering conditions and suitable Sm substituting fraction, larger Ms and higher He can be obtained at room temperature for (SmxDy1-x)36Co64 films.
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