Exchange coupling strength in synthetic ferrimagnetic media

Inomata, A.; Abarra, E.N.; Acharya, B.R.; Akimoto, H.; Okamoto, Iwao

doi:10.1109/20.950867

Cited by 18 publications

(7 citation statements)

References 9 publications

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“…SFM with larger tended to also have greater compared to SFM with smaller . Dynamic measurements showed the difference is more pronounced at longer field time exposures [10]. Torque magnetometer measurements of the magnetic anisotropy revealed the same value regardless of ; was unchanged.…”

Section: B Coercivitymentioning

confidence: 73%

“…is approximately 190 Oe which is low for this particular medium. The usual values are 400 Oe [8]- [10]. The magnetization versus field segments were also measured after positive field saturation.…”

Section: Resultsmentioning

confidence: 99%

“…Adequate thickness control in the optimum range of 0.6-0. 8 thickness control over a 3.5″ disk is sufficient to ensure uniformity in properties, especially thermal stability which is sensitive to exchange coupling between the layers [10]. Fig.…”

Section: B Fabricationmentioning

confidence: 99%

“…Minor loops were taken in the range of to 2000 Oe after initial saturation where layer is least affected and the stabilizing layer is reversed [8]. A detailed discussion of can be found in [10].…”

Section: B Exchange Fieldmentioning

confidence: 99%

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Synthetic ferrimagnetic media

et al. 2001

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The thermal stability and read-write performance of longitudinal magnetic recording media with antiferromagnetically coupled layers are investigated. The thermal stability is strongly dependent on the interaction between layers and the anisotropy energy of the stabilizing layer or layers. For media with two coupled layers, the energy barrier is increased by approximately 45% of the anisotropy energy of the stabilizing layer. Although the total thickness is larger compared to a conventional medium with the same remanence magnetization and thickness product , the resolution is higher and depends on a thickness proportional to the magnetization difference between the layers. With these "synthetic ferrimagnetic" structures, thermally stable, low and high resolution media are made possible.

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Section: B Coercivitymentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: B Fabricationmentioning

confidence: 99%

Section: B Exchange Fieldmentioning

confidence: 99%

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Synthetic ferrimagnetic media

et al. 2001

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“…H ex was determined from the center of a minor loop measured by application of a reverse field up to Ϫ500 Oe after saturation at above ϩ10 kOe. 9 Here, t 1 and M S1 are the total thickness and average magnetization of both L1 and the E-layer, respectively. Figure 2 shows the in-plane hysteresis loops of SFM with two different J values.…”

mentioning

confidence: 99%

Improved thermal stability of synthetic ferrimagnetic media with enhanced exchange coupling strength

Inomata

Abarra

Acharya

et al. 2002

Applied Physics Letters

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The effect of the antiferromagnetic interlayer exchange coupling strength J between the initial or stabilization magnetic layer L1 and the top magnetic layer L2 on the thermal stability of synthetic ferrimagnetic media (SFM) is investigated. Enhanced J is achieved by the insertion of a thin Co-rich hexagonal close-packed layer between the Ru layer and L1, and such a structure did not change the read/write properties significantly. The contribution of the anisotropy energy of L1 to the thermal stability of SFM is improved by increasing J. However, a significant increase in the contribution of L1 to the thermal stability is achieved at relatively low J values (0.14 erg/cm2) which translate into only a 3–4% increase in the switching field H0.

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