Electron spectroscopic imaging analysis of compositional inhomogeneity in CoCrTa longitudinal thin film media

Yahisa, Y.; Kimoto, Koji; Usami, Katsuhisa; Matsuda, Yukio; Inagaki, Jun-ichi; Furusawa, K.; Narishige, S.

doi:10.1109/20.490168

Cited by 35 publications

(10 citation statements)

References 14 publications

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“…4(a). The Cr content in the CO alloy layer is considered to be enriched at the crystal grain boundary because of Cr segregation, which has been observed by TEM combined with an electron-energy-loss analysis [8] in a sample prepared at high temperatures as in this study. And the activation volume of the 14-nm-thick magnetic layer, which is estimated to be 2 .…”

Section: Resultsmentioning

confidence: 98%

Experimental study of thermal decay in high-density magnetic recording media

et al. 1997

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Absiract -The thermal decay of written bits in CoCrPt/CrTi thin film media for high density longitudinal magnetic recording is examined using a magnetoresistive head at room temperature. A decay in signal output over time is observed for the media with a thin magnetic layer less than about 14 nm thick and the media noise increases. The thermal stability factor Ku.V/k.T of these media is estimated to be less than about 100. The signal decay and noise increase are more serious at higher linear recording densities. These results are consistent with the results of a micromagnetic simulation taking into account the thermal aftereffects. These characteristics suggest that media with a large magnetic anisotropy constant Ku will be required to realize high storage densities of over 10 Gbhn'.

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Section: Resultsmentioning

confidence: 98%

Experimental study of thermal decay in high-density magnetic recording media

et al. 1997

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“…Numerous studies have demonstrated that these CoCr-based films can be grown in such a way as to produce compositionally inhomogeneous Co-and Cr-enriched regions. [6][7][8][9][10][11][12] Although significant work has been performed over the past decade, demonstrating that compositional and structural inhomogeneities play an important role in determining the magnetic properties of these materials, [3][4][5]10,11,13 the most significant control of the films' magnetic properties is achieved through tailoring the Co and Cr concentrations. Interestingly, although the Cr is paramount in prescribing the magnetic response, no direct measure of the magnetic role of the essential Cr has been performed.…”

Section: ͓S0021-8979͑97͒00502-1͔mentioning

confidence: 99%

“…Although this measurement cannot identify the location of these magnetic Cr atoms, it is possible that these magnetic Cr atoms are the small percentage of Cr in the Co-enriched regions of CoCr-based films as suggested in previous studies. [10][11][12]32 This would then mean that the Cr-enriched regions of the film are indeed nonferromagnetic. However, our results do not preclude the possibility that the Cr MCD signal is due, in part, to the Cr atoms in the Cr-enriched regions of the film.…”

Section: Figmentioning

confidence: 99%

Direct observation of Cr magnetic order in CoCrTa and CoCrPt thin films

Kemner

Idzerda

Harris

et al. 1997

Journal of Applied Physics

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“…It was in late 1980's when a relation between the nonmagnetic Cr concentration in LMR-CoCrTa recording layer and the medium noise property was investigated and it was demonstrated that a Cr-rich CoCrTa thin film medium showed a lower noise property [61][62][63][64][65] . Magnetic crystal grain isolation while controlling the diameter in the recording layer was realized necessary for highdensity perpendicular magnetic recording to increase the coercivity, the recording resolution and to decrease the medium noise.…”

Section: Introductionmentioning

confidence: 99%

Development of Media Nanostructure for Perpendicular Magnetic Recording

Futamoto

Ohtake

2017

J. Magn. Soc. Jpn.

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The review covers the research and development of perpendicular media nanostructure focusing on the recording layer. The recording layer material includes the Co-alloys with hcp structure, the magnetic multilayers, and the alloys with ordered structures that have high magneto-crystalline anisotropies (Ku). The technologies of underlayer or interlayer for aligning the easy magnetization axis of magnetic crystal grain perpendicular to the film plane are briefly reviewed including the high Ku magnetic materials for future recording media.Observations of compositional and magnetization structures in sub-µm scale have played important roles in improving the recording layer. Typical data on these characteristics are explained in relation to the media structure improvements. Considering that high Ku magnetic materials will be employed in future recording media, basic experimental results related in controlling the easy magnetization axis and in keeping the surface flatness of L10-ordered magnetic materials are explained. Future possibilities for increasing the areal density beyond 1 Tb/in 2 by improving the magnetic material and the nanostructure of recording layer are also discussed.

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Electron spectroscopic imaging analysis of compositional inhomogeneity in CoCrTa longitudinal thin film media

Cited by 35 publications

References 14 publications

Experimental study of thermal decay in high-density magnetic recording media

Experimental study of thermal decay in high-density magnetic recording media

Direct observation of Cr magnetic order in CoCrTa and CoCrPt thin films

Development of Media Nanostructure for Perpendicular Magnetic Recording

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