The Elliott relation in pure metals

Beuneu, F.; Monod, P.

doi:10.1103/physrevb.18.2422

Cited by 138 publications

(76 citation statements)

References 6 publications

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“…In the widely investigated Ni 80 Fe 20 /Cu, for example, DR NL initially increases on cooling but then drops (by 10-40%, dependent on dimensions) below B40 K (refs 8,10,18,30-33). This is in stark contrast to expectations from the E-Y mechanism 17,38 , which posits t s pt p (where t s is the NM spin lifetime and t p the momentum relaxation time), that is, that spin relaxation occurs with finite probability at each momentum scattering event (B1 Â 10 À 3 for pure Cu 38 ). A monotonic decrease in NM resistivity (r N ) on cooling implies a monotonic increase in t p , and thus a monotonic increase in t s and l N , in direct contradiction with observations.…”

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confidence: 47%

Kondo physics in non-local metallic spin transport devices

et al. 2014

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The non-local spin-valve is pivotal in spintronics, enabling separation of charge and spin currents, disruptive potential applications and the study of pressing problems in the physics of spin injection and relaxation. Primary among these problems is the perplexing nonmonotonicity in the temperature-dependent spin accumulation in non-local ferromagnetic/ non-magnetic metal structures, where the spin signal decreases at low temperatures. Here we show that this effect is strongly correlated with the ability of the ferromagnetic to form dilute local magnetic moments in the NM. This we achieve by studying a significantly expanded range of ferromagnetic/non-magnetic combinations. We argue that local moments, formed by ferromagnetic/non-magnetic interdiffusion, suppress the injected spin polarization and diffusion length via a manifestation of the Kondo effect, thus explaining all observations. We further show that this suppression can be completely quenched, even at interfaces that are highly susceptible to the effect, by insertion of a thin non-moment-supporting interlayer.

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confidence: 47%

Kondo physics in non-local metallic spin transport devices

et al. 2014

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“…This allowed to study the temperature dependent spin relaxation of conduction electrons via the line width and gave the first insights into the time scales of spin relaxation. [95][96][97] It motivated the theoretical work. Later, the Kambersk y model 98 was developed for energy relaxation of the ferromagnetic resonance (FMR).…”

Section: Theoretical Perspectivesmentioning

confidence: 99%

Perspective: Ultrafast magnetism and THz spintronics

Walowski

Münzenberg

2016

Journal of Applied Physics

326

205

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This year the discovery of femtosecond demagnetization by laser pulses is 20 years old. For the first time, this milestone work by Bigot and coworkers gave insight directly into the time scales of microscopic interactions that connect the spin and electron system. While intense discussions in the field were fueled by the complexity of the processes in the past, it now became evident that it is a puzzle of many different parts. Rather than providing an overview that has been presented in previous reviews on ultrafast processes in ferromagnets, this perspective will show that with our current depth of knowledge the first applications are developed: THz spintronics and all-optical spin manipulation are becoming more and more feasible. The aim of this perspective is to point out where we can connect the different puzzle pieces of understanding gathered over 20 years to develop novel applications. Based on many observations in a large number of experiments. Differences in the theoretical models arise from the localized and delocalized nature of ferromagnetism. Transport effects are intrinsically non-local in spintronic devices and at interfaces. We review the need for multiscale modeling to address the processes starting from electronic excitation of the spin system on the picometer length scale and sub-femtosecond time scale, to spin wave generation, and towards the modeling of ultrafast phase transitions that altogether determine the response time of the ferromagnetic system. Today, our current understanding gives rise to the first usage of ultrafast spin physics for ultrafast magnetism control: THz spintronic devices. This makes the field of ultrafast spin-dynamics an emerging topic open for many researchers right now. Published by AIP Publishing. [http://dx

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“…The former of these equations is known as the Elliott relation. The EY theory 2 explained spin relaxation for most monovalent elemental metals, 4,5 later studies showed its validity in one-dimensional 6 and polyvalent 7,8 metals, and its generalization explained the spin relaxation in metals with strong correlations. 9,10 The recent discovery of graphene 11 directed the attention of spintronics research toward carbon nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Testing the Elliott-Yafet spin-relaxation mechanism in KC8: A model system of biased graphene

et al. 2012

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Temperature-dependent electron spin resonance (ESR) measurements are reported on stage-1 potassium-doped graphite, a model system of biased graphene. The ESR linewidth is nearly isotropic, and although the g factor has a sizable anisotropy, its majority is shown to arise due to macroscopic magnetization. Even though the homogeneous ESR linewidth shows an unusual, nonlinear temperature dependence, it appears to be proportional to the resistivity which is a quadratic function of the temperature. These observations suggests the validity of the Elliott-Yafet relaxation mechanism in KC 8 and allows us to place KC 8 on the empirical Beuneu-Monod plot among ordinary elemental metals.

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The Elliott relation in pure metals

Cited by 138 publications

References 6 publications

Kondo physics in non-local metallic spin transport devices

Kondo physics in non-local metallic spin transport devices

Perspective: Ultrafast magnetism and THz spintronics

Testing the Elliott-Yafet spin-relaxation mechanism in KC8: A model system of biased graphene

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