Abstract
High energy product Sm-Co based films have been synthesized by selectively thermalized rf sputtering in an in-plane magnetic field of 2.5 kOe. The films are made premagnetized and in most cases fields to 20 kOe do not increase the available moment. For those SmCo5 films that are directly crystallized onto heated substrates, a maximum coercive force of 23 kOe and BHmax=18 MG Oe is obtained. For those SmCo5 films that are sputtered first amorphous and then crystallized, coercive forces in the range of 22 kOe are observed. Samples of Sm2(CoFeZr)17 have been directly crystallized with a coercive force of 7 kOe and BHmax=21 MG Oe, and crystallized from an amorphous state with coercivities of 16–20 kOe. As previously reported for certain SmCo5 films all of these films exhibit flat-topped hysteresis loops. Further measurements on a new (Sm+Ti)Fe5 phase we previously reported have been made. High-field measurements to 90 kOe made on a 5 at. % Ti (Ti:Fe=1:19) sample gave an inplane coercive force of 10 kOe with an energy product of 12 MG Oe at −100 °C. Curie temperatures of 5, 10, and 15 at. % Ti samples are 608, 630, and 670 K, respectively.
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