Discontinuous Resistance Change and Domain Wall Scattering in Patterned NiFe Wires With a Nanoconstriction

Lepadatu, Serban; Xu, Yongbing

doi:10.1109/tmag.2004.832369

Cited by 6 publications

(3 citation statements)

References 14 publications

(27 reference statements)

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“…Lepadatu and Xu observed a drop in resistance of permalloy and Ni nanocontacts (down to ∼ 50 nm across) with increasing current that they ascribe to the removal of a domain wall by current induced wall motioncurrent densities of 10 11 A/m 2 were required to cause the resistance drop [382,383]. The largest drop observed was of the order of 0.1 per centequivalent to 3 per cent MR in the wall after correction for the current distribution and domain dilution in the device, substantially larger than the AMR.…”

Section: Experimental Explorationmentioning

confidence: 99%

Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

216

163

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Electrical currents flowing in ferromagnetic materials are spinpolarised as a result of the spin-dependent band structure. When the spatial direction of the polarisation changes, in a domain structure, the electrons must somehow accommodate the necessary change in direction of their spin angular momentum as they pass through the wall. Reflection, scattering, and a transfer of angular momentum to the lattice are all possible outcomes, depending on the circumstances. This gives rise to a variety of different physical effects, most importantly a contribution to the electrical resistance caused by the wall, and a motion of the wall driven by the spin-polarised current.Historical and recent research on these topics is reviewed. * Phone: +44(0)113 3433780

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Section: Experimental Explorationmentioning

confidence: 99%

Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

216

163

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“…This opened the possibility of using DWs as the source for a large magnetoresistance effect. Experiments on domain wall magnetoresistance (DWMR) showing a positive effect have been reported using different ferromagnetic structures such as thin films [4], cross-shaped junctions [5], zigzag wires [6], constricted wires [7,8], and micrometer-sized elements [9]. Micromagnetic simulation studies of constricted wires and nanobridges have already carried out [10,11].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and simulation of nanostructures for domain wall magnetoresistance studies on nickel

Claudio-Gonzalez¹,

Husain²,

Groot³

et al. 2010

Journal of Magnetism and Magnetic Materials

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We report the use of electron beam lithography and a bilayer liftoff process to fabricate magnetic Ni nanostructures with constriction widths in the range of 22 to 41 nm. The structures fabricated correspond to the nanobridge geometry. Reproducibility and control over the final nanostructure geometry were observed when using the fabrication process introduced, these two qualities are important in order to carry out a more systematic analysis of domain wall magnetoresistance (DWMR). On the other hand, micromagnetic simulations of structures with the nanobridge geometry were carried out using not only the dimensions of the fabricated nanostructures but also smaller dimensions thought to be achievable with further optimization of the fabrication process. It was found that domain walls with a reduced length of 42.5 nm can be obtained using the nanobridge geometry. Furthermore, the anisotropic magnetoresistance (AMR) effect was calculated numerically and it was found to be smaller than the DWMR, this makes the nanobridge geometry a good candidate for future measurements of the magnetoresistive effect due to domain wall scattering.

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“…Magnetoresistance (MR) measurement is useful for characterizing the spin properties of ferromagnetic nanostructures. 10,11 The detection of a MR signal from the artificial spin-ice may provide an insight into the unique magnetization dynamics in the lattice structure. 12,13 The DW nucleation and motion in the network structure occur at a field much lower than the saturation field.…”

Section: Introductionmentioning

confidence: 99%

Low field domain wall dynamics in artificial spin-ice basis structure

Kwon

Goolaup

Lim

et al. 2015

Journal of Applied Physics

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Artificial magnetic spin-ice nanostructures provide an ideal platform for the observation of magnetic monopoles. The formation of a magnetic monopole is governed by the motion of a magnetic charge carrier via the propagation of domain walls (DWs) in a lattice. To date, most experiments have been on the static visualization of DW propagation in the lattice. In this paper, we report on the low field dynamics of DW in a unit spin-ice structure measured by magnetoresistance changes. Our results show that reversible DW propagation can be initiated within the spin-ice basis. The initial magnetization configuration of the unit structure strongly influences the direction of DW motion in the branches. Single or multiple domain wall nucleation can be induced in the respective branches of the unit spin ice by the direction of the applied field. V

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Discontinuous Resistance Change and Domain Wall Scattering in Patterned NiFe Wires With a Nanoconstriction

Cited by 6 publications

References 14 publications

Spin-polarised currents and magnetic domain walls

Spin-polarised currents and magnetic domain walls

Fabrication and simulation of nanostructures for domain wall magnetoresistance studies on nickel

Low field domain wall dynamics in artificial spin-ice basis structure

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