Advancements in PMR thin-film media

Judy, J.

doi:10.1016/j.jmmm.2004.10.004

Cited by 43 publications

(10 citation statements)

References 58 publications

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“…[1][2][3] Strong anisotropy can result in switching magnetic field larger than the available magnetic field of the write heads. In order to reduce the switching field, exchange-coupled hard/soft bilayers with the constituent layers of particulate structure have been proposed 4,5 and fabricated.…”

Section: Magnetization Reversal Mechanism Of Perpendicularly Exchangementioning

confidence: 99%

Magnetization reversal mechanism of perpendicularly exchange-coupled composite L1-FePt/CoCrPt bilayers

Zhou

et al. 2009

Journal of Applied Physics

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Magnetization reversal mechanism in perpendicularly exchange-coupled composite hard/soft L10-FePt/CoCrPt bilayers with different soft layer thickness has been studied using magnetometry and magnetotransport measurements. For thin soft layers, the magnetization reversal process can be described by the rigid model. For thick soft layers, a different magnetization reversal process is observed which consists of three stages. An exchange-spring spin structure is first formed from the positive saturation magnetic field to small negative magnetic field. In the second stage, a Néel wall is driven and squeezed. In the last stage, multiple domain structure is formed laterally to reduce the dipolar interaction and the magnetization reversal is accomplished by the pinned domain wall motion in the hard layer.

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Section: Magnetization Reversal Mechanism Of Perpendicularly Exchangementioning

confidence: 99%

Magnetization reversal mechanism of perpendicularly exchange-coupled composite L1-FePt/CoCrPt bilayers

Zhou

et al. 2009

Journal of Applied Physics

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“…Since the middle of the 1970s, when Iwasaki et al proposed perpendicular magnetic recording as an alternative to conventional longitudinal magnetic recording [1][2][3], thin films with out-of-plane magnetic anisotropy have been widely studied for recording media applications [4][5][6][7] as well as for patterned magnetic media [8][9][10][11]. Magnetic films with perpendicular magnetic anisotropy (PMA) patterned into stripes and lines [12][13][14][15] have been also proposed for nanoscale spintronic devices such as those based on current-driven domain-wall motion [16,17].…”

Section: Introductionmentioning

confidence: 99%

Microscopic reversal magnetization mechanisms in CoCrPt thin films with perpendicular magnetic anisotropy: Fractal structure versus labyrinth stripe domains

et al. 2017

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The magnetization reversal of CoCrPt thin films has been examined as a function of thickness using magnetooptical Kerr effect (MOKE) microscopy and first-order reversal curves (FORC) techniques. MOKE images show differentiated magnetization reversal regimes for different film thicknesses: while the magnetic domains in 10-nm-thick CoCrPt film resemble a fractal structure, a labyrinth stripe domain configuration is observed for 20-nm-thick films. Although FORC distributions for both cases show two main features related to irreversible processes (propagation and annihilation fields) separated by a mostly flat region, this method can nonetheless distinguish which magnetization reversal process is active according to the horizontal profile of the first FORC peak, or propagation field. A single-peak FORC profile corresponds to the fractal magnetization reversal, whereas a flat-peak FORC profile corresponds to the labyrinth magnetization reversal.

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“…Ferromagnetic (FM) thin films with strong out-of-plane magnetic anisotropy have been widely studied for perpendicular magnetic recording media applications [1,2]. For this purpose, perpendicular anisotropy systems can be designed with high thermal stability to avoid superparamagnetic behavior [3] and with good writeability [1], but this may raise the switching field above that which can be produced by currently available write heads.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal and exchange bias effects in hard/soft ferromagnetic bilayers with orthogonal anisotropies

et al. 2012

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The magnetization reversal processes are discussed for exchangecoupled ferromagnetic hard/soft bilayers made from Co 0.66 Cr 0.22 Pt 0.12 (10 and 20 nm)/Ni (from 0 to 40 nm) films with out-of-plane and in-plane magnetic easy axes respectively, based on room temperature hysteresis loops and first-order reversal curve analysis. On increasing the Ni layer thicknesses, the easy axis of the bilayer reorients from out-of-plane to in-plane. An exchange bias effect, 2 consisting of a shift of the in-plane minor hysteresis loops along the field axis, was observed at room temperature after in-plane saturation. This effect was associated with specific ferromagnetic domain configurations experimentally determined by polarized neutron reflectivity. On the other hand, perpendicular exchange bias effect was revealed from the out-of-plane hysteresis loops and it was attributed to residual domains in the magnetically hard layer.

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Advancements in PMR thin-film media

Cited by 43 publications

References 58 publications

Magnetization reversal mechanism of perpendicularly exchange-coupled composite L1-FePt/CoCrPt bilayers

Magnetization reversal mechanism of perpendicularly exchange-coupled composite L1-FePt/CoCrPt bilayers

Microscopic reversal magnetization mechanisms in CoCrPt thin films with perpendicular magnetic anisotropy: Fractal structure versus labyrinth stripe domains

Magnetization reversal and exchange bias effects in hard/soft ferromagnetic bilayers with orthogonal anisotropies

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