Magnetization switching behavior in nanostructured NiFe/Co/Cu/Co spin-valve

Asada, Hironori; Matsuyama, K.; Hosokawa, Y.; Taniguchi, Kouji

doi:10.1109/20.706378

IEEE Trans. Magn.

1998

DOI: 10.1109/20.706378

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Magnetization switching behavior in nanostructured NiFe/Co/Cu/Co spin-valve

Hironori Asada

K. Matsuyama

Y. Hosokawa

et al.

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Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The narrowest multilayer or spin-valve structures previously studied were approximately 200 nm in width. 3 We have developed a technique utilizing a combination of electron beam lithography and ion milling which has been used to pattern Cu/Co wires to widths as narrow as 35 nm.…”

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confidence: 99%

“…This is attributable to a magnetostatic broadening effect, similar to that reported in unannealed NiFe/Ag multilayer stripes 6 and NiFe/Co/Cu/Co spin valves. 3 In the case of the first maxima, the interlayer exchange coupling dominates the energetics, so it is not surprising that increasing the wire aspect ratio from 40:1 to 120:1 produces no discernible change in H s . When the strength of the interlayer exchange coupling is reduced, as in Figs.…”

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confidence: 99%

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Width dependence of giant magnetoresistance in Cu/Co multilayer nanowires

Katine

Palanisami

Buhrman

1999

Applied Physics Letters

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mentioning

confidence: 99%

mentioning

confidence: 99%

Width dependence of giant magnetoresistance in Cu/Co multilayer nanowires

Katine

Palanisami

Buhrman

1999

Applied Physics Letters

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Magnetic properties of patterned tunnel junctions

Warot

Petford‐Long

Anthony

2003

Journal of Applied Physics

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Patterned magnetic tunnel junctions are being actively studied for their application in magnetic random access memory (MRAM) and read-heads. For MRAM application purposes, a clean magnetization reversal is one of the required properties. Various parameters such as junction size, shape or layer sequence are being investigated to optimize element properties. In this article, we report the results of Lorentz transmission electron microscopy used to study the magnetization reversal mechanism of (Ta/NiFe/MnFe/NiFe/Al2O3/NiFeCo) tunnel junction elements. Single layer NiFeCo element properties have also been investigated for comparison with the tunnel junctions. The results on tunnel junctions show the influence of size and aspect ratio of the patterned elements on magnetic properties. For the wider elements, domain formation and propagation is the dominant reversal mechanism and no asymmetry is observed between the antiparallel (AP) to parallel (P) and P–AP reversal measured as a function of aspect ratio. Single-domain reversal is the main process for narrower elements and there is an asymmetry in reversal field between the AP–P and P–AP reversals as a function of aspect ratio. Many energy terms (such as Néel coupling, stray field coupling, and the internal demagnetizing field) need to be taken into account to explain this behavior.

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Giant magnetoresistance properties of patterned IrMn exchange biased spin valves

Mao

Giusti

Amin

et al. 1999

Journal of Applied Physics

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Giant magnetoresistance (GMR) responses were studied in micron-sized IrMn pinned spin valve stripes. As the stripe height is decreased both the pinning field and free layer bias field increase while the GMR ratio stays almost constant. The free layer coercivity becomes zero for the shortest stripe while the pinned layer coercivity drops slightly at high aspect ratio. The pinned layer switching field is enhanced in the patterned films, indicating a strong magnetostatic coupling between the free and pinned layer that was further simulated micromagnetically.

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Magnetization switching behavior in nanostructured NiFe/Co/Cu/Co spin-valve

Cited by 3 publications

References 6 publications

Width dependence of giant magnetoresistance in Cu/Co multilayer nanowires

Width dependence of giant magnetoresistance in Cu/Co multilayer nanowires

Magnetic properties of patterned tunnel junctions

Giant magnetoresistance properties of patterned IrMn exchange biased spin valves

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