Conductance of ferro- and antiferro-magnetic single-atom contacts: A first-principles study

Tan, Zhiyun; Zheng, Xiaolong; Xiang, Yu‐Tao; Xie, Yuee; Ke, San-Huang

doi:10.1063/1.4817654

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…[84] that spin-polarized conductance for two-atom Co and Ni contacts is 14 and 45%, respectively, given their ferromagnetic ordering, because in both cases the spin-up electronic states are filled up and their density at the Fermi level is low. At the same time, densities of spin-down electronic states for Co and Ni are at the Fermi level and spindown electrons make a major contribution to the contact conductance.…”

Section: Spin Filtermentioning

confidence: 99%

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Formation and properties of metallic atomic contacts

Klavsyuk¹,

Saletsky²

2015

Phys.-Usp.

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One of the most topical and promising areas in present-day physics is the study of the physical properties of metallic few-atom contacts, which are attractive not only for their application prospects, but also because of the possibility to verify with their aid various theoretical approaches through theory-vs-experiment comparison. This review mainly focuses on theoretical approaches to understanding the formation processes and properties of metallic atomic contacts.

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Section: Spin Filtermentioning

confidence: 99%

“…Local density of states in a two-atom Ni contact situated between Ni(001) electrodes for ferromagnetic (FM) and antiferromagnetic (AFM) ordering of atoms in the contact[84].…”

mentioning

confidence: 99%

Formation and properties of metallic atomic contacts

Klavsyuk¹,

Saletsky²

2015

Phys.-Usp.

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Quantum transport in oxidized Ni nanocontacts under mechanical strain

Razavifar

Saffarzadeh

Palacios³

2020

Phys. Rev. B

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Orbital origin of the electrical conduction in ferromagnetic atomic-size contacts: Insights from shot noise measurements and theoretical simulations

et al. 2016

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With the goal to elucidate the nature of spin-dependent electronic transport in ferromagnetic atomic contacts, we present here a combined experimental and theoretical study of the conductance and shot noise of metallic atomic contacts made of the 3d ferromagnetic materials Fe, Co, and Ni. For comparison, we also present the corresponding results for the noble metal Cu. Conductance and shot noise measurements, performed using a low-temperature break junction setup, show that in these ferromagnetic nanowires: (i) there is no conductance quantization of any kind, (ii) transport is dominated by several partially-open conduction channels, even in the case of single-atom contacts, and (iii) the Fano factor of large contacts saturates to values that clearly differs from those of monovalent (nonmagnetic) metals. We rationalize these observations with the help of a theoretical approach that combines molecular dynamics simulations to describe the junction formation with nonequilibrium Green's function techniques to compute the transport properties within the Landauer-Büttiker framework. Our theoretical approach successfully reproduces all the basic experimental results and it shows that all the observations can be traced back to the fact that the d bands of the minority-spin electrons play a fundamental role in the transport through ferromagnetic atomic-size contacts. These d bands give rise to partially open conduction channels for any contact size, which in turn lead naturally to the different observations described above. Thus, the transport picture for these nanoscale ferromagnetic wires that emerges from the ensemble of our results is clearly at variance with the well established conduction mechanism that governs the transport in macroscopic ferromagnetic wires, where the d bands are responsible for the magnetism but do not take part in the charge flow. These insights provide a fundamental framework for ferromagneticbased spintronics at the nanoscale.

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Conductance of ferro- and antiferro-magnetic single-atom contacts: A first-principles study

Cited by 4 publications

References 29 publications

Formation and properties of metallic atomic contacts

Formation and properties of metallic atomic contacts

Quantum transport in oxidized Ni nanocontacts under mechanical strain

Orbital origin of the electrical conduction in ferromagnetic atomic-size contacts: Insights from shot noise measurements and theoretical simulations

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