Micromagnetics of side shielded perpendicular magnetic recording heads

Takano, K.; Liu, Yue; Liu, Kowang; Bai, D.; Min, Tai; Wu, Yan; Dovek, M.

doi:10.1016/j.phpro.2011.06.103

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Bold numbers indicate stack compositions with saturation magnetisation larger than the Slater-Pauling limit of l 0 M S ¼ 2. 45 plasma-sputter-deposited Gd/Cr/FeCo 351 have been investigated experimentally for their high-moment potential. Although FM coupling between those Gd and Fe MLs adjacent to the Cr spacer was proven by XMCD measurements 410 (shown in Fig.…”

Section: Re/ie/tm and Re/cr/tm Systemsmentioning

confidence: 99%

“…The Slater-Pauling limit gives the upper known saturation magnetisation M S of any bulk magnetic material at room temperature, known to date, with l 0 M S ¼ 2. 45 T for Fe 65-70 Co 35-30 binary alloys. Although HAMR could be successful in circumventing the need for higher magnetisations in pole tips, technical difficulties have delayed its introduction in commercial HDDs.…”

Section: Introductionmentioning

confidence: 99%

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A review of high magnetic moment thin films for microscale and nanotechnology applications

et al. 2016

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The creation of large magnetic fields is a necessary component in many technologies, ranging from magnetic resonance imaging, electric motors and generators, and magnetic hard disk drives in information storage. This is typically done by inserting a ferromagnetic pole piece with a large magnetisation density M S in a solenoid. In addition to large M S , it is usually required or desired that the ferromagnet is magnetically soft and has a Curie temperature well above the operating temperature of the device. A variety of ferromagnetic materials are currently in use, ranging from FeCo alloys in, for example, hard disk drives, to rare earth metals operating at cryogenic temperatures in superconducting solenoids. These latter can exceed the limit on M S for transition metal alloys given by the Slater-Pauling curve. This article reviews different materials and concepts in use or proposed for technological applications that require a large M S , with an emphasis on nanoscale material systems, such as thin and ultra-thin films. Attention is also paid to other requirements or properties, such as the Curie temperature and magnetic softness. In a final summary, we evaluate the actual applicability of the discussed materials for use as pole tips in electromagnets, in particular, in nanoscale magnetic hard disk drive read-write heads; the technological advancement of the latter has been a very strong driving force in the development of the field of nanomagnetism.

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Section: Re/ie/tm and Re/cr/tm Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%