Magnetotransport and Trapping of Magnetic Domain Walls in Spin Valves With Nanoconstrictions

Noh, Su Jung; Chun, Byong Sun; Wu, Han; Shvets, I. V.; Chu, In Chang; Abid, Mohamed; Serrano-Guisan, S.; Kim, Y. K.

doi:10.1109/tmag.2011.2158400

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…On the other hand, this effect can be considered as a tool for precision scanning of nanowire thickness uniformity. For this purpose, one has to move a domain wall along the wire what can be done in different ways 10,11 . According to our results, noticeable jumps in T MR should be observed in the area of heterogeneity (thickening or thinning).…”

Section: Discussionmentioning

confidence: 99%

“…An order of magnitude smaller value of BMR (about 30 %) was observed in Fe-Fe contacts 8 . Some authors have studied the effects associated with the geometric parameters of the domain wall and its dynamics [9][10][11] , the geometry and electronic structure of the contacts 12 , as well as the type of the contact separating area 13,14 . In recent works 15,16 , the behavior of TMR in tunnel junctions with embedded nanoparticles was investigated.…”

Section: Introductionmentioning

confidence: 99%

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Jump of tunneling magnetoresistance in magnetic nanocontacts with mismatched cross section

Katkov,

Osipov

2020

Preprint

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We have studied the influence of the transverse size of a magnetic tunnel nanojunction on the magnitude of the magnetoresistance. During modeling, the size of the right contact was fixed, while the size of the left one gradually changed until they coincided. We found a sharp drop in the tunneling magnetoresistance (TMR) in nanocontacts with mismatched cross section. This can be explained by the peculiarities of the spatial distribution of the electron density, which is different for majority and minority-spin states. The discovered effect must be taken into account in the design of TMR-based nanodevices.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Jump of tunneling magnetoresistance in magnetic nanocontacts with mismatched cross section

Katkov,

Osipov

2020

Preprint

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“…Similar effects have been reported on nanosized contacts or constrictions in spinvalves. 7 Different techniques have been used to fabricate nanosized constrictions: most of them are created by e-beam lithography with various methods by placing notches on a magnetic wire. 8 thus, the resulting controlled v t /v b ratio allows us to create bi-conical track shapes with welldefined nanosized constrictions a few nanometers in diameter.…”

Section: P Brunomentioning

confidence: 99%

Magnetic nanoconstrictions made from nickel electrodeposition in polymeric bi-conical tracks: Magneto-transport behavior

Clochard¹,

Jouad²,

Biziere³

et al. 2014

Radiation Physics and Chemistry

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In a cylindrical magnetic nanowire, a magnetic domain wall (DW) can move along the wire when an applied magnetic field or a spin-polarized current is applied. We show that in a magnetic device composed of two conical nanowires connected by a nanosized constriction, a DW can be trapped and detrapped. The magnetoreistance and the relaxation processes of the DW exhibit a specific behaviour. Such a device has been fabricating by Ni electrodeposition in bi-conical tracks polymer membrane made of Swift Heavy Ions bombarded poly(VDF-co-TrFE) copolymer and poly(ethylene terephtalate) PET thin films.The latter method allows to monitor the conicity of the bi-conical wires and to give access to a panel of very well-defined structures.

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“…The difference in the pad size is pro-posed to facilitate a magnetic configuration, where a DW is formed at the constriction due to the shape anisotropy at which the magnetization in the pads switches. 16 To trap a DW, a V-shaped nanoconstriction with a size of 40 nm is located in the middle of two pads with different widths. The pads have two electrodes made of nonmagnetic material, 35 nm-thick Au, for measurement of magneto-transport properties ( Fig.…”

mentioning

confidence: 99%

“…Minor magneto-transport curves with the sweep field along the (e) easy and (f) perpendicular direction to the sample axis.FIG. 2.A SEM image of a (a) patterned device16 and (b) two electrodes for measurement of magnetotransport properties.242409-2Chun et al Appl. Phys.…”

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confidence: 99%

Domain wall configuration and magneto-transport properties in dual spin-valve with nanoconstriction

Chun

Noh

et al. 2012

Applied Physics Letters

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We investigated the effect of external field on magneto-transport properties of synthetic antiferromagnet dual spin-valve with nanoconstriction with focus on domain wall (DW) configuration and magnetization reversal process. As magnetic field rotated from in-plane to out-of-plane along hard axis configuration, the magnetization reversal mode changed from a vortex to a transverse type, and a multistep switching process appeared due to the development of a transverse magnetization reversal mode with DW pushing towards the higher anisotropy region. The difference in the shape of nanoconstriction made an asymmetric energy barrier to the DW propagation which resulted in an asymmetry depinning field.

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Magnetotransport and Trapping of Magnetic Domain Walls in Spin Valves With Nanoconstrictions

Cited by 6 publications

References 9 publications

Jump of tunneling magnetoresistance in magnetic nanocontacts with mismatched cross section

Jump of tunneling magnetoresistance in magnetic nanocontacts with mismatched cross section

Magnetic nanoconstrictions made from nickel electrodeposition in polymeric bi-conical tracks: Magneto-transport behavior

Domain wall configuration and magneto-transport properties in dual spin-valve with nanoconstriction

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