Co-based alloy media with a high coercivity prepared by heat treatment after sputtering

Sato, M.; Onishi, Y.; Nakaue, A.

doi:10.1109/20.281269

Cited by 22 publications

(8 citation statements)

References 2 publications

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“…In order to reduce medium noise, it is necessary that the grains of the magnetic layer should be magnetically isolated from each other. The heat-treatment effect on CoCrTa or CoCr in-plane magnetic films was already reported by previous works [2,3]. They concluded that the isolation of magnetic particles could be enhanced by heat-treatment and that the coercivity of Coternary alloy/Cr double layered films was increased after heat-treatment [3].…”

Section: Introductionmentioning

confidence: 50%

“…The heat-treatment effect on CoCrTa or CoCr in-plane magnetic films was already reported by previous works [2,3]. They concluded that the isolation of magnetic particles could be enhanced by heat-treatment and that the coercivity of Coternary alloy/Cr double layered films was increased after heat-treatment [3]. We already attempted the Si (100) substrate instead of NiP/AI substrate or glass substrate and reported that the pre-treatment of HF on Si (100) substrate clearly improved magnetic properties and crystalline orientation [4].…”

Section: Introductionmentioning

confidence: 80%

“…The difference in the Cr concentration in the magnetic upperlayer after the heattreatment could be attribute to the difference between the diffusion of the Cr and that of the Cr silicide. It was reported that diffusion of Cr into magnetic upperlayer enhanced the isolation of magnetic particle, resulting in the increase in Hc [2,3]. In order to investigate this point in detail, the AM measurement was carried out.…”

Section: Methodsmentioning

confidence: 99%

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et al. 1997

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Abstract---In CoCrTa/Cr double-layered thin films deposited on Si single crystalline substrates, the effect of Ti addition in the Cr underlayer on magnetic properties and microstructural properties of the films before and after heat-treatment was investigated. The CoCrTa/Cr films turned to be nonmagnetic after heattreatment at 550°C. On the other hand, the coercivity of CoCrTa/CrTi films was greatly increased by the heat-treatment at 550°C. X-ray diffraction patterns indicated that Cr silicide was formed for the film with Cr underlayer and not formed for the film with Cr 94 Ti 6 underlayer after the heat-treatment at 550°C. The grain size of the film with the Cr underlayer was decreased. However, the grains seemed to be Cr silicide, CrSi z , from the result of the XRD patterns. In the case of the CoCrTa/Cr 94 Ti 6 , the distribution of the grain size was narrowed and the region around the grains seemed to be amorphous-like structure after the heaf-treatment at 550°C. It was shown with Auger Electron Spectroscopic depth profiles that, in the film with the Cr underlayer, the Si diffusion into the magnetic upperlayer occurred after the heat-treatment at 550°C, whereas with the CrTi underlayer, no diffusion of Si occurred and Cr concentration in magnetic upperlayer was increased in the films. Furthermore, the ~M value of CoCrTa/Cr 94 Ti 6 film shifted from a positive to a negative region with the increase in the heat-treatment temperature. After the heat-treatment at 550°C, the surface morphology of the film with the Cr underlayer became rougher by precipitate, whereas those of the film with the Cr 94 Ti 6 underlayer was kept smooth. These results imply that the increase in coercivity of the CoCrTa/CrTi film after the heat-treatment is attributed to the suppression of the Si diffusion into the magnetic upperlayer and to the enhancement of the magnetic isolation between the grains in the upperlayer by the Cr diffusion.

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Section: Introductionmentioning

confidence: 50%

Section: Introductionmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

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et al. 1997

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“…The magnetic moment was measured at 509, 501, and 476 emu/cm 3 for xϭ100%, 80%, and 60% respectively. The Cr diffusion from the underlayer into the Co alloy has been reported for longitudinal media 8 and is expected to be the cause of the decrease in H c in these materials.…”

Section: Resultsmentioning

confidence: 75%

Ru x Cr 1−x / Ta underlayer for Co-alloy perpendicular magnetic recording

Wierman

Klemmer

Lü

et al. 2002

Journal of Applied Physics

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The effects of the Ru x Cr 1Ϫx /Ta underlayer on the microstructural and magnetic properties of CoCrPtB perpendicular films were investigated. The hcp Ru x Cr 1Ϫx ͑0002͒ texture was observed to grow perpendicular to the film plane with narrow rocking curves of 2°-3°. High-resolution transmission electron microscopy indicated epitaxial growth of the CoCrPtB on top of the Ru x Cr 1Ϫx /Ta underlayer. In-plane x-ray diffraction scans indicate that as the Cr atomic composition increases in the Ru x Cr 1Ϫx underlayer, the a-lattice parameter was found to contract more closely matching the CoCrPtB a-lattice parameter ͓measured with (112 0)͔. In addition, the rocking curves for the CoCrPtB ͑0002͒-texture induced by the ͑0002͒ textured Ru x Cr 1Ϫx buffer showed narrowing peaks (4.5°-3.5°) as the Cr concentration increased from 0% to 40%.

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“…These processes occur within a magnetic layer. Recently, T. Kawanabe et al [8] and M. Sat0 et al [9] found that the coercivity of CO-ternary alloy/Cr films increased after annealing. This increase in coercivity was considered to be caused by grain isolation, which is enhanced by Cr atoms diffused from the underlayer into the grain boundaries in the CO alloy layer.…”

Section: Introductionmentioning

confidence: 99%

Interdiffusion and grain isolation in Co/Cr thin films

1994

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A bstact--In this work, interdiffusion and grain isolation in Co/Cr films have been investigated by studying the dependence of the magnetic properties on the substrate preheating temperature as well as on post-deposition annealing processes. By choosing pure CO instead of a Co-alloy, the possibility of grain isolation caused by the segregation of solute atoms from within the magnetic layer has been eliminated. It is found that both post-deposition thermal annealing and substrate preheating can effectively increase the isolation of the C O grains.

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Co-based alloy media with a high coercivity prepared by heat treatment after sputtering

Cited by 22 publications

References 2 publications

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Ru x Cr 1−x / Ta underlayer for Co-alloy perpendicular magnetic recording

Interdiffusion and grain isolation in Co/Cr thin films

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