Effect of Microstructure and Magnetic Properties by Doping Ru element into Cr Underlayer of Cr/CoCrPtTaB Longitudinal Recording Media
Date Issued
2005
Date
2005
Author(s)
Sheng, Chung-Han
DOI
zh-TW
Abstract
In this thesis, we investigated the effect of microstructure and magnetic properties by doping Ru into Cr underlayer of Cr/CoCrPtTaB longitudinal recording media. At first, the thickness of magnetic layer were fixed at 500Å, and that of underlayer were changed from 150Å to 600Å. We discuss the effect of microstructure and magnetic properties after doping Ru into underlayer. Then, we choose a stable condition on magnetic property for further experiment. The thickness of underlayer layer were fixed at 400Å, and that of magnetic layer were changed from 100Å to 500Å.
All samples were made by dc magnetron sputtering on corning glass substrate. After depositing samples, we did composition analysis, structure identification, microstructure observation, and magnetic properties measurement for them. By X-ray diffraction, the peak of Cr(200) shift to low angle after Ru doping into Cr underlayer. It can be verified that some Ru atoms exist in Cr lattice site as substitutional solid solution. Grain size calculation in plane-view TEM images, after doping Ru into underlayer of Cr(250Å)/CoCrPtTaB(500Å) and Cr(500Å) /CoCrPtTaB(500Å) grain size can be reduced from 118Å to 103Å and from 112Å to 54Å, respectively. In high resolution cross-section TEM observation, we can verify that atomic stacking in interface is epitaxial growth. In high resolution plane-view TEM images, we can observe “texture line” in bi-layer structure of longitudinal recording media. By magnetic properties measurement, coercivity can be enhanced by increasing thickness of underlayer, especially Cr9Ru1 underlayer. Mrt calculating results indicated that underlayer with Ru or not won’t make an effective influence, and the value of Mrt is always fall into the range of 0.25 – 0.35 memu/cm2.Then, coercivity and Mrt product will increase with the increasing of Ru doping into Cr underlayer from 0 to 15 at%.
Subjects
水平紀錄
Ru
磁性
longitudinal recording
magnetic
Type
thesis
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