Experimental observation of solute segregation in longitudinal CoPtCr/Cr magnetic thin films

Kim, Myong R.; Guruswamy, Sivaraman; Johnson, Kenneth E.

doi:10.1109/20.281265

Cited by 19 publications

(7 citation statements)

References 8 publications

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“…The grain are more isolated with the increase in the width. On the other hand, no boundary phase was observed in the CoNiCr and the CoCrPt films in this experiment, though Cr segregation was reported to be observed [5]. Figure 3 shows high resolution TEM (HRTEM) images of Co-12at%Cr-2at%Ta films.…”

Section: A Magnetic Propertiesmentioning

confidence: 59%

Relation between microstructure of grain boundary and the intergranular exchange in CoCrTa thin film for longitudinal recording media

et al. 1994

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In CoCrTa "s, the relationship between the microstrnctnre of grain boundaries and degree of intergranular exchange coupling was investigated. The degree of intergranular exchange coupling decreases as Ta content increases. By TEM observation, it was revealed that the boundary phase, which appears to be amorphous, surrounds the grains. The width of this boundary phase tends to become thicker as Ta content increases From the result of an E M analysis, the Cr content at the grain boundaries is higher than that in the grains. The bonndary phase may be non-magnetic due to its high concentration of Cr. On the other hand, in this experiment, no boundary phase was observed in CoNiCr and CoCrPt filum which have the higher degree of intergranular exchange coupling than CoCrTa flhna Therefore, the change in the boundary phase may be effective in redncing the degree of intergranuhr exchange coupling.

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Section: A Magnetic Propertiesmentioning

confidence: 59%

Relation between microstructure of grain boundary and the intergranular exchange in CoCrTa thin film for longitudinal recording media

et al. 1994

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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%

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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“…On the other hand, it is well-known that in conventional Co alloy media, Cr rich regions forming at grain boundaries are found to reduce exchange coupling, resulting in lower media noise. 8 Therefore it might be expected that similar segregation mechanism would work in Cr-doped fct CoPt films. In this study, (Co 86 Cr 14 ) x Pt 1Ϫx :C nanocomposite films were prepared and studied.…”

mentioning

confidence: 99%

CoPtCr:C nanocomposite films for high density recording

Zeng

Liu

Sellmyer

2001

Journal of Applied Physics

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We report results on the magnetic properties of nanocomposite films of the form (Co86Cr14)xPt1−x:C, which were prepared by magnetron sputtering and subsequent annealing. X-ray diffraction shows that these films consist of CoPtCr grains with the face-centered-tetragonal structure embedded in an amorphous C matrix. Magnetic properties such as coercivity (Hc), remanence ratio (S), and coercive squareness (S*) are strongly dependent on the Pt and C composition and annealing temperatures. Compared with previously reported CoPt:C films with a equiatomic Co and Pt ratio, lower exchange coupling and higher S and S* at the same C concentration were obtained. Hc values ranging from 2 to 10 kOe and S close to 1 were achieved for film thicknesses down to 10 nm. These features make CoPtCr:C nanocomposite films very attractive for next-generation high-density recording.

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Experimental observation of solute segregation in longitudinal CoPtCr/Cr magnetic thin films

Cited by 19 publications

References 8 publications

Relation between microstructure of grain boundary and the intergranular exchange in CoCrTa thin film for longitudinal recording media

Relation between microstructure of grain boundary and the intergranular exchange in CoCrTa thin film for longitudinal recording media

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

CoPtCr:C nanocomposite films for high density recording

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