| Summary: | The microstructural and magnetic properties of perpendicular anisotropic CoCrPt films deposited on Ru or RuCoCrX (X = Ti, Re) intermediate layers were studied. The <i>c</i>-axis of CoCrPt grains were promoted by (0002) textured RuCoCr, and RuCoCrX (X = Ti, Re) intermediate layers due to smaller lattice misfit as compared to Ru. The narrower rocking width (Δθ<sub>50</sub> = 3.76°) in RuCoCrRe intermediate layer and CoCrPt shows higher out of plane coercivity (<i>H<sub>c</sub></i> = 6.2 kOe), magnetic anisotropy constant (<i>K<sub>u</sub></i> = 6.2 × 10<sup>6</sup> erg/cm<sup>3</sup>) and nucleation field (<i>H<sub>N</sub></i> = −2.8kOe) as compared to the Ru intermediate layer (<i>H<sub>c</sub></i> = 5.4 kOe, <i>K<sub>u</sub></i> = 5.9 × 10<sup>6</sup> erg/cm<sup>3</sup>, <i>H<sub>N</sub></i> = −1.6 kOe). The partial intergranular exchange decoupling of CoCrPt grains was observed. The grain boundaries oxides were formed by the residual oxygen in targets and sputtering processes. The minor Cr<sub>2</sub>O<sub>3</sub>, CoO, TiO<sub>2</sub>, ReO<sub>3</sub> oxides were investigated by surface analysis. Due to the minor oxides and Cr segregation at grains boundaries, the CoCrPt films present high coercivity. Samples CoCrPt/RuCoCr and CoCrPt/RuCoCrTi present a minimum at 45° but the values are much higher than the ideal Stoner-Wohlfarth theoretical value 0.5 which could be due to fewer natural oxides for magnetic grains separation. In sample CoCrPt/RuCoCrRe, there is an increase of intergranular interaction as indicated by the large asymmetry and the shift of the minimum at lower angles.
|
|---|