Telegraph noise due to domain wall motion driven by spin current in perpendicular magnetized nanopillars

Cucchiara, J.; Henry, Y.; Ravelosona, D.; Lacour, Daniel; Fullerton, Eric E.; Katine, J. A.; Mangin, Stéphane

doi:10.1063/1.3089569

Cited by 28 publications

(17 citation statements)

References 24 publications

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“…The principal possibility of driving domain walls using currents was confirmed experimentally for L-shaped elements [63,64], for ring-shaped [65,66] and straight [67] structures with constrictions, and in multilayer wires [68]. While most studies were performed on Py, also magnetic semiconductors [69][70][71] and materials with out-of-plane magnetization [72][73][74][75][76][77][78][79][80] were investigated. The discovery of current-driven domain wall motion led to the suggestion that the effect might be employed as a new generation of storage devices (so-called Racetrack memory, see [81] for a review).…”

Section: Spin-torque In Lateral Structures: Current-induced Domain Wamentioning

confidence: 99%

Current-driven magnetization switching and domain wall motion in nanostructures—Survey of recent experiments

Lindner

2010

Superlattices and Microstructures

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Section: Spin-torque In Lateral Structures: Current-induced Domain Wamentioning

confidence: 99%

Current-driven magnetization switching and domain wall motion in nanostructures—Survey of recent experiments

Lindner

2010

Superlattices and Microstructures

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“…First of all it could be shown that by tuning the anisotropy of [Co/Ni] for nanopillars with spin valve structure, the critical currents for spin torque could be further reduced, while thermal stability was maintained, what is a key point towards applications [39,40]. Another studied effect was the creation of domain walls in nanostructures driven by spin-polarized currents [41] and concomitant telegraph noise [42].…”

Section: Introductionmentioning

confidence: 99%

Co/Ni(111) superlattices studied by microscopy, x-ray absorption, andab initiocalculations

et al. 2012

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We explore the origins of perpendicular magnetic anisotropy in epitaxial and textured Co/Ni (111) superlattices using a combination of thin film growth, structural characterization, x-ray magnetic circular dichroism (XMCD) and ab-initio calculations. Transmission electron microscopy and x-ray diffraction experiments allow us to show that the "bulk" magnetoelastic contribution to the total magnetic energy is small compared to the interface anisotropy. The magnetic properties are studied by using XMCD at the Co and Ni L 2,3 edges. Hysteresis loops performed at the Co L 3 edge confirm the perpendicular magnetization for Co thicknesses up to 4 monolayers. The spin and orbital moments were deduced using the XMCD sum rules. The results are explained by considering two kinds of magnetic moments for Co, distinguishing the interfaces from the rest of the layers. Both effective spin and orbital moments of Co atoms are found to be enhanced at the Co-Ni interfaces, whereas the magnetic moment of Co surrounded by Co is similar to the bulk values. Ab-initio calculations allow us to show a strong enhancement of the dipole operator contribution on Co atoms at the interface that is partly responsible for this high effective spin moment at the interface. Such a moment enhancement is not observed for Ni, the dipole operator contribution being close to zero. Finally, we observed a very surprising proportionality between the effective spin and orbital moments, independent of the absorption edge or deposition technique used. We assign this peculiar behavior to the fact that the magnetic dipole operator involved in the sum rules is closely linked to the increase of the Co orbital moment at the interface. Based on XMCD results obtained on both molecular beam epitaxy and sputter deposited samples, this link allows us to show the extreme sensitivity of the perpendicular anisotropy with the chemical ordering at the interface. 2

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“…This can occur either through direct reflection when DW width ∆ ∼ λ F [16], or by spin-dependent scattering of electrons by the disorder inside the DWs [17,18]. Recently, the fluctuations in R in different forms of nano-magnetic structures have been associated with the motion of DWs [19,20], although the details of the time dependence of R due motion of individual DWs remain unexplored.…”

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Tracking Random Walk of Individual Domain Walls in Cylindrical Nanomagnets with Resistance Noise

2010

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The stochasticity of domain wall (DW) motion in magnetic nanowires has been probed by measuring slow fluctuations, or noise, in electrical resistance at small magnetic fields. By controlled injection of DWs into isolated cylindrical nanowires of nickel, we have been able to track the motion of the DWs between the electrical leads by discrete steps in the resistance. Closer inspection of the time-dependence of noise reveals a diffusive random walk of the DWs with an universal kinetic exponent. Our experiments outline a method with which electrical resistance is able to detect the kinetic state of the DWs inside the nanowires, which can be useful in DW-based memory designs.

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Telegraph noise due to domain wall motion driven by spin current in perpendicular magnetized nanopillars

Cited by 28 publications

References 24 publications

Current-driven magnetization switching and domain wall motion in nanostructures—Survey of recent experiments

Current-driven magnetization switching and domain wall motion in nanostructures—Survey of recent experiments

Co/Ni(111) superlattices studied by microscopy, x-ray absorption, andab initiocalculations

Tracking Random Walk of Individual Domain Walls in Cylindrical Nanomagnets with Resistance Noise

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