Effects of Ag seed layer on the properties of CoCrPt/Ti perpendicular media : Exchange coupling constant, domain size and coercivity

概要

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Several kinds of 2 nm metal layer (M=Al, Cu, Ni, Cr, Ag, Mg, Fe, Co, Pd, Au, Pt, Mo and Hf) were sputtered to increase Hc and Ku of CoCrPt/Ti perpendicular media. Among them Ag was very effective to increase Hc of (Co_78Cr_22)_100-xPt_x/Ti (x= 14, 20) films when 2 nm Ag, 18 nm Ti layer and 10 - 20 nm CoCrPt films were subsequently sputtered on Coming 7059 glass at 4000℃. However, the effect was more pronounced when thickness of (Co_78Cr_22)_100-xPt_x film was reduced to 10 nm. In addition a decreased when Ag layer was used. The film thickness below which Ag was effective was reduced if Pt content was decreased to 14 at %. However, normal XRD experiment revealed that Ag did not promote c-axis growth of Ti and CoCrPt layer in the perpendicular direction. In the MFM observation domain size was reduced when Ag layer was introduced, which showed that films with good c-axis alignment could give lower Hc and wide domain width because of strong magnetic coupling between grains.
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2002-11-01