Preparation of Sm-Co/Cr Film with High Coercivity.

Fabrication of Sm–Co films with perpendicular magnetic anisotropy

“…It was found that the coercivity in the in-plane direction was about 4:5 kOe [2] and the Sm-Co layer consisted of nano-crystallites surrounded by amorphous matrix [3]. When the Sm-Co/Cr film was prepared at 250 C; it was revealed that the Sm-Co layer with (1 1 0) orientation grew epitaxially onto the Cr underlayer with (0 0 2) plane [4] and the coercivity in the in-plane direction was higher than that of the non-substrate-heated film [5].…”

Effect of Sm–Co layer thickness on magnetic properties of crystallized Sm–Co/Cr films

“…The diffraction lines from Cr ͑110͒ and ͑200͒ plane were observed, although only Cr ͑110͒ diffraction line was observed for the nonsubstrate-heated films. 2 The intensity of the Cr ͑200͒ line was higher than that of the ͑110͒ line. According to our latest study, 7 the intensity ratio between the ͑200͒ line and the ͑110͒ line was changed by the preparing conditions, while the substrate heating was essential to form the ͑200͒ preferred-oriented structure.…”

“…The film with the Sm-Co layer thickness (␦ Sm-Co ) of 40 nm had the coercivity higher than 4 kOe. 2 Zana et al 3 reported that the coercivity was about 3 kOe even though the ␦ Sm-Co was 10 nm. In x-ray diffraction ͑XRD͒ diagrams, however, no diffraction lines from SmCo phase could be observed.…”

Sputter-Deposited SmCo5 Thin Films with Perpendicular Magnetic Anisotropy for High Density Magnetic Recording Media

“…In the case of thin films, the temperature was reported to be 200 to 400 o C (7)(8)(9)(10)(11)(12), which is lower than the ordinary ordering temperature of L1 0 Fe-Pt alloy (13,14). Indeed, some researchers applied a Sm-Co alloy thin film to longitudinal magnetic recording media from as early as 1980's (8,(15)(16)(17). However, perpendicular magnetic recording media of Sm-Co alloy have not been investigated.…”