Magnetoresistance in a Constricted Domain Wall

Prieto, José Luis Rodríguez-Villasante y; Blamire, M. G.; Evetts, J.E.

doi:10.1103/physrevlett.90.027201

Cited by 45 publications

(38 citation statements)

References 21 publications

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“…Of course it is natural to wish to drive the current through the exchange spring walls in a current-perpendicular-to-the-plane (CPP) geometry. This is what has been done by Prieto et al using NiFe/Gd/NiFe trilayers patterned into pillars [245]. At room temperature the Gd will be barely magnetised at all (the Curie temperature is 293 K) and so the NiFe layers will adopt a fluxclosed antiparallel configuration.…”

Section: Heterostructuressupporting

confidence: 57%

“…(Similar measurements of individual Co nanowires were made by Vila et al [276].) Walls of controlled size were formed in Co wires by growing them on a GdCo 1.6 substrate to create an exchange spring structure [302], a similar technique to that employed in the multilayers [243,245] discussed above in §4.3.2. This structure gives just the same sort of domain wall parallel to the interface, which these authors call a Zeeman domain wall, the thickness of which can be controlled by varying the applied field -in this paper the range studied was from 10 down to 5 nm thickness.…”

Section: Mesoscopic Devicesmentioning

confidence: 76%

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Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

218

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: Heterostructuressupporting

confidence: 57%

Section: Mesoscopic Devicesmentioning

confidence: 76%

Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

218

163

View full text Add to dashboard Cite

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“…8 is the small negative intercept b = -1.02 ± 0.08 erg/cm 2 , suggesting a negative interfacial exchange energy. This value is of the same order of magnitude as in other RE-TM alloy multilayers such as Gd-Fe [31] and could be related to the composition change at the interface and the long range nature of exchange interactions in RE-TM systems [32].…”

Section: Interfacial Domain Wallsmentioning

confidence: 51%

Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

et al. 2015

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Spring magnets based on GdCo multilayers have been prepared to study the nucleation and evolution of interfacial domain walls (iDW) depending on layer composition and interlayer coupling. GdCo alloy compositions in each layer were chosen so that their net magnetization aligns either with the Gd (Gd 35 Co 65 ) or Co (Gd 11 Co 89 ) sublattices. This condition forces an antiparallel arrangement of the layers' net magnetization and leads to nucleation of iDWs above critical magnetic fields whose values are dictated by the interplay between Zeeman and exchange energies. By combining x-ray resonant magnetic scattering with Kerr magnetometry we provide detailed insight into the nucleation and spatial profile of the iDWs. For strong coupling (GdCo/GdCo' bilayer), iDWs are centered at the interface but with asymmetric width depending on each layer magnetization. When interlayer coupling is weakened by introducing a thin Gd interlayer, the exchange spring effect becomes restricted to a lower temperature and field range than observed in the bilayer structure. Due to the ferromagnetic alignment between the high magnetization Gd 35 Co 65 layer and the Gd interlayer, the iDW shrinks and moves into the lower exchange Gd interlayer causing a reduction of interfacial domain wall energy.2

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“…6 Other recent applications of REs and their alloys are the reduction of spin-transfer noise in reading heads, 7 tuning the resonance of a magnetic domain wall, 8 and the nucleation and characterization of an in-plane magnetic domain wall. 9,10 Any study or application related to thin films of REs and their alloys with TMs requires a careful characterization of their magnetic structure. This is usually done with techniques that are available only in a few sites around the world, such as resonant x-ray magnetic scattering or polarized neutron reflectometry.…”

Section: Introductionmentioning

confidence: 99%

Enhanced exchange and reduced magnetization of Gd in an Fe/Gd/Fe trilayer

et al. 2011

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The exchange interaction of Gd adjacent to Fe has been characterized by transport measurements on a double spin valve with a Fe/Gd/Fe trilayer as the middle layer. Our measurements show that the ferromagnetism of the Gd is enhanced by the presence of the Fe, and it remains ferromagnetic over its Curie temperature up to a thickness no smaller than 1 nm adjacent to the Fe. This thickness is more than double what has been reported before. Additionally, the saturation magnetization of the thin Gd layer sandwiched in Fe was found to be half of its bulk value. This reduced magnetization does not seem to be related to the proximity of Fe but rather to the incomplete saturation of Gd even for very high fields.

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Magnetoresistance in a Constricted Domain Wall

Cited by 45 publications

References 21 publications

Spin-polarised currents and magnetic domain walls

Spin-polarised currents and magnetic domain walls

Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

Enhanced exchange and reduced magnetization of Gd in an Fe/Gd/Fe trilayer

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