Composite media for perpendicular magnetic recording

Victora, R. H.; Shen, Xiao

doi:10.1109/tmag.2004.838075

Cited by 492 publications

(287 citation statements)

References 9 publications

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“…While high anisotropy ͑K u ͒ materials, such as L1 0 FePt alloys, 3 would dramatically improve thermal stability, the magnetic fields required for switching such a high K u bit far exceed the capabilities of the write head. Tilted, 4,5 and exchange coupled composite ͑ECC͒ media, 6 as well as heat-assisted magnetic recording, 7 and microwave-assisted magnetic recording techniques, 8 have been proposed to lower the necessary writing field. An extension of ECC media is termed graded media where the anisotropy is varied, either discretely or continuously, 9 over many layers and is predicted to provide additional gains in writabilty over conventional bi-layer hard/soft ECC media.…”

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confidence: 99%

Continuously graded anisotropy in single (Fe53Pt47)100−xCux films

Zha

Dumas

Fang

et al. 2010

Applied Physics Letters

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We report on continuously graded anisotropy. During deposition, a compositional gradient is achieved by varying the Cu concentration from Cu-rich (Fe53Pt47)70Cu30 to Cu-free Fe53Pt47. The anisotropy gradient is then realized after annealing using the composition dependence of the low-anisotropy (A1) to high-anisotropy (L10) ordering temperature. The critical role of the annealing temperature on the resultant anisotropy gradient is investigated. Magnetic measurements support the creation of an anisotropy gradient in properly annealed films which exhibit both a reduced coercivity and moderate thermal stability. These results demonstrate that an anisotropy gradient can be realized, and tailored, in single continuous films without the need for multilayers.

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confidence: 99%

Continuously graded anisotropy in single (Fe53Pt47)100−xCux films

Zha

Dumas

Fang

et al. 2010

Applied Physics Letters

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“…[3][4][5][6][7][8] The desired effect is to be able to use the very strong anisotropy of a hard layer to enhance the grains thermal stability and hence prevent data loss due to thermally activated grain reversal. The hard layer is then exchange coupled to a layer with lower anisotropy, the soft layer.…”

Section: Energy Landscapes and Rate Equations In Ecc Mediamentioning

confidence: 99%

“…[3][4][5][6][7][8] This can be defined as the ratio between the energy barrier E B (thermal stability) and saturation field (switching energy) at a particular sweep rate as,…”

Section: Figure Of Merit For Ecc Mediamentioning

confidence: 99%

“…Modern exchange-coupled composite (ECC) recording media is composed of a high anisotropy 'hard' layer exchange coupled to one or more lower anisotropy 'soft' layers. [3][4][5][6][7][8][9] One of the most important applications of micromagnetic modeling is the characterization of recording media through M H hysteresis loops. Often, model parameters are determined by fitting results to experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Thermally activated switching at long time scales in exchange-coupled magnetic grains

et al. 2015

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Rate coefficients of the Arrhenius-Néel form are calculated for thermally activated magnetic moment reversal for dual layer exchange-coupled composite (ECC) media based on the Langer formalism and are applied to study the sweep rate dependence of M H hysteresis loops as a function of the exchange coupling I between the layers. The individual grains are modelled as two exchange coupled Stoner-Wohlfarth particles from which the minimum energy paths connecting the minimum energy states are calculated using a variant of the string method and the energy barriers 2

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“…[1][2][3][4][5][6][7] Early work focussed on potential applications in permanent magnets. 3,4 But more recently, exchange spring media have been proposed for magnetic data storage.…”

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confidence: 99%

Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

Martin

Wang

Bowden

et al. 2006

Applied Physics Letters

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Abstract.Magnetization loops for (110) MBE grown ErFe 2 /YFe 2 multilayer films are presented and discussed. The magnetocrystalline easy axis for the Er layers is parallel to a <111> type crystal axis, with the out of plane <111> axes favoured by the strain. For fields applied along the (110) crystal growth axis, out-of-plane magnetic exchange springs are set up in the magnetically soft YFe 2 layers. For multilayer films that display exchange spring dominated reversal at low temperatures, there is a cross-over temperature above which there are additional transitions at high fields. These features are interpreted using micro-magnetic modelling. At sufficiently high fields, applied perpendicular to the multilayer film plane, the energy is minimized by an exchange spring driven multilayer spin flop. In this state, the average magnetization of the ErFe 2 layers switches into a nominally hard in-plane <111> axis, perpendicular to the applied field.

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Composite media for perpendicular magnetic recording

Cited by 492 publications

References 9 publications

Continuously graded anisotropy in single (Fe53Pt47)100−xCux films

Continuously graded anisotropy in single (Fe53Pt47)100−xCux films

Thermally activated switching at long time scales in exchange-coupled magnetic grains

Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

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