Effect of competing energies on the transition noise of oriented magnetic media

Hee, C. H.; Wang, J. P.

doi:10.1063/1.1506786

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…It is also noted that a similar conclusion was found in the highly oriented longitudinal media [19], [20]. It should be pointed out that even with the marginal increase of OR from 1.0 ( ) to 1.35 ( rad), SNR improvement is very significant from about 2 dB to about 20 dB.…”

Section: A In-plane or Effect On A Longitudinal Recording System Witsupporting

confidence: 62%

“…It was reported that in-plane magnetic orientation could improve the recording performance in longitudinal recording [19]. Since it is difficult to fabricate the ideal tilted media with magnetic easy axis either along the down-track or cross-track direction by normal sputtering techniques, in plane orientation may become one of the most critical factors to determine the feasibility of the fabrication of tilted media.…”

Section: In-plane Orientation Effect On Tilted Mediamentioning

confidence: 99%

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Approaches to tilted magnetic recording for extremely high areal density

Wang

Zou²,

Hee³

et al. 2003

IEEE Trans. Magn.

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In this paper, we systematically present the fundamental understandings of advantages of tilted magnetic recording. We investigate the various configurations of tilted magnetic recording including tilted longitudinal recording, tilted perpendicular recording with tilted media and normal single pole head, and tilted perpendicular recording with perpendicular media and tilted writing head. Tilted media with easy axis along the down-track and cross-track directions and tilted media with varied in-plane orientation ratios have been investigated and compared in detail. One important finding is that slight oriented (in-plane) tilted media shows a tremendous improvement in recording performance, which may release the pressure on the fabrication of perfect tilted hard disk magnetic media. Various fabrication methods for tilted media have also been discussed.

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Section: A In-plane or Effect On A Longitudinal Recording System Witsupporting

confidence: 62%

Section: In-plane Orientation Effect On Tilted Mediamentioning

confidence: 99%

Approaches to tilted magnetic recording for extremely high areal density

Wang

Zou²,

Hee³

et al. 2003

IEEE Trans. Magn.

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“…[50][51][52][53] While the simulation of Charap and Lu used isotropic media, later work on simulation and experimental studies pointed out that oriented media ͑ORϾ 1͒ showed larger thermal stability than isotropic media. 2 .…”

Section: A Oriented Mediamentioning

confidence: 99%

Perpendicular recording media for hard disk drives

Piramanayagam

2007

Journal of Applied Physics

415

168

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Perpendicular recording technology has recently been introduced in hard disk drives for computer and consumer electronics applications. Although conceptualized in the late 1970s, making a product with perpendicular recording that has competing performance, reliability, and price advantage over the prevalent longitudinal recording technology has taken about three decades. One reason for the late entry of perpendicular recording is that the longitudinal recording technology was quite successful in overcoming many of its problems and in staying competitive. Other reasons are the risks, problems, and investment needed in making a successful transition to perpendicular recording technology. Iwasaki and co-workers came up with many inventions in the late 1970s, such as single-pole head, CoCr alloy media with a perpendicular anisotropy, and recording media with soft magnetic underlayers [S. Iwasaki and K. Takemura, IEEE Trans. Magn. 11, 1173 (1975); S. Iwasaki and Y. Nakamura, IEEE Trans. Magn. 14, 436 (1978); S. Iwasaki, Y. Nakamura, and K. Ouchi, IEEE Trans. Magn. 15, 1456 (1979)]. Nevertheless, the research on perpendicular recording media has been intense only in the past five years or so. The main reason for the current interest comes from the need to find an alternative technology to get away from the superparamagnetic limit faced by the longitudinal recording. Out of the several recording media materials investigated in the past, oxide based CoCrPt media have been considered a blessing. The media developed with CoCrPt-oxide or CoCrPt–SiO2 have shown much smaller grain sizes, lower noise, and larger thermal stability than the perpendicular recording media of the past, which is one of the reasons for the success of perpendicular recording. Moreover, oxide-based perpendicular media have also overtaken the current longitudinal recording media in terms of better recording performance. Several issues that were faced with the soft underlayers have also been solved by the use of antiferromagnetically coupled soft underlayers and soft underlayers that are exchange coupled with an antiferromagnetic layer. Significant improvements have also been made in the head design. All these factors now make perpendicular recording more competitive. It is expected that the current materials could theoretically support areal densities of up to 500–600Gbits∕in.2. In this paper, the technologies associated with perpendicular recording media are reviewed. A brief background of magnetic recording and the challenges faced by longitudinal recording technology are presented first, followed by the discussions on perpendicular recording media. Detailed discussions on various layers in the perpendicular recording media and the recent advances in these layers have been made. Some of the future technologies that might help the industry beyond the conventional perpendicular recording technology are discussed at the end of the paper.

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“…The monodispersed L1 0 -FePt NPs are promising candidates for high-density magnetic recording, which could push the superparamagnetic limit. − Sun and co-workers pioneered the use of L1 0 -FePt nanocrystals for magnetic recording . Because the ordered temperature of L1 0 -FePt is above 550 °C, they prepared A1-FePt NPs and then converted them to L1 0 -FePt nanocrystal superlattices with the thickness of 180 nm (Figure C) by the annealing treatment.…”

Section: Synthesis and Magnetism Exploration Of Mnssmentioning

confidence: 99%

Magnetic Nanostructures: Rational Design and Fabrication Strategies toward Diverse Applications

Wang

et al. 2022

Chem. Rev.

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In recent years, the continuous development of magnetic nanostructures (MNSs) has tremendously promoted both fundamental scientific research and technological applications. Different from the bulk magnet, the systematic engineering on MNSs has brought a great breakthrough in some emerging fields such as the construction of MNSs, the magnetism exploration of multidimensional MNSs, and their potential translational applications. In this review, we give a detailed description of the synthetic strategies of MNSs based on the fundamental features and application potential of MNSs and discuss the recent progress of MNSs in the fields of nanomedicines, advanced nanobiotechnology, catalysis, and electromagnetic wave adsorption (EMWA), aiming to provide guidance for fabrication strategies of MNSs toward diverse applications.

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Effect of competing energies on the transition noise of oriented magnetic media

Cited by 8 publications

References 22 publications

Approaches to tilted magnetic recording for extremely high areal density

Approaches to tilted magnetic recording for extremely high areal density

Perpendicular recording media for hard disk drives

Magnetic Nanostructures: Rational Design and Fabrication Strategies toward Diverse Applications

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