Digital record theory for a thin medium with easy magnetisation direction tilted out of its plane

Cumpson, S.R.; Middleton, B.K.; Miles, J.J.

doi:10.1016/0304-8853(95)00647-8

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…During the read-back process, a magnetic recording head is used to sense the leakage flux. SNR is calculated based on the summation of read-back voltages generated by and component of magnetization respectively [13], [14]. The read-back voltage generated by component of magnetization is omitted due to wide track width.…”

Section: Theoretical Modelmentioning

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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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: Theoretical Modelmentioning

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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“…Tilted magnetic recording was initially used with magnetic tapes, and better recording performance has been achieved [29,30]. Theoretical studies have shown a 62% increase in recording density for tilted media (easy axis inclination: 45 • ) made from high K u materials in comparison to perpendicular recording media [27].…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal in a preferred oriented (111) L1₀FePt grown on a soft magnetic metallic glass for tilted magnetic recording

Wang

Sharma

Makino

2012

J. Phys.: Condens. Matter

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L1(0) FePt is an important material for the fabrication of high density perpendicular recording media, but the ultrahigh coercivity of L1(0) FePt restricts its use. Tilting of the magnetic easy axis and the introduction of a soft magnetic underlayer can solve this problem. However, high temperature processing and the requirement of epitaxial growth conditions for obtaining an L1(0) FePt phase are the main hurdles to be overcome. Here, we introduce a bilayered magnetic structure ((111) L1(0) FePt/glassy Fe(71)Nb(4)Hf(3)Y(2)B(20)/SiO(2)/Si) in which the magnetic easy axis of L1(0) FePt is tilted by ~36° from the film plane and epitaxial growth conditions are not required. The soft magnetic underlayer not only promotes the growth of L1(0) FePt with the preferred orientation but also provides an easy cost-effective micro/nanopatterning of recording bits. A detailed magnetic characterization of the bilayered structure in which the thickness of (111) L1(0) FePt with the soft magnetic Fe(71)Nb(4)Hf(3)Y(2)B(20) glassy underlayer varied from 5 to 60 nm is carried out in an effort to understand the magnetization switching mechanism. The magnetization switching behavior is almost the same for bilayered structures in which FePt layer thickness is >10 nm (greater than the domain wall thickness of FePt). For FePt film ~10 nm thick, magnetization reversal takes place in a very narrow field range. Magnetization reversal first takes place in the soft magnetic underlayer. On further increase in the reverse magnetic field, the domain wall in the soft magnetic layer compresses at the interface of the hard and soft layers. Once the domain wall energy becomes sufficiently large to overcome the nucleation energy of the domain wall in L1(0) FePt, the magnetization of the whole bilayer is reversed. This process takes place quickly because the domain walls in the hard layer do not need to move, and the formation of a narrower domain wall may not be favorable energetically. Our results showed that the present bilayered structure is very promising for the fabrication of tilted bit-patterned magnetic recording media.

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Information Storage Materials

Wochele

Middleton

Houten

et al. 2004

Ullmann's Encyclopedia of Industrial Chemistry

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Digital record theory for a thin medium with easy magnetisation direction tilted out of its plane

Cited by 9 publications

References 7 publications

Approaches to tilted magnetic recording for extremely high areal density

Approaches to tilted magnetic recording for extremely high areal density

Magnetization reversal in a preferred oriented (111) L1₀FePt grown on a soft magnetic metallic glass for tilted magnetic recording

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Digital record theory for a thin medium with easy magnetisation direction tilted out of its plane

Cited by 9 publications

References 7 publications

Approaches to tilted magnetic recording for extremely high areal density

Approaches to tilted magnetic recording for extremely high areal density

Magnetization reversal in a preferred oriented (111) L10FePt grown on a soft magnetic metallic glass for tilted magnetic recording

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Magnetization reversal in a preferred oriented (111) L1₀FePt grown on a soft magnetic metallic glass for tilted magnetic recording