2e
                  2
              /h
           to e2/h switching of quantum conductance associated with a change in nanoscale ferromagnetic domain structure

Ono, Teruo; Ooka, Yutaka; Miyajima, H.; Otani, Y.

doi:10.1063/1.124774

Cited by 129 publications

(108 citation statements)

References 17 publications

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“…4 It was recently predicted that quantum confinement of the electronic states in metallic atomic chains should lead to a magnetic ground state, and to a superparamagnetic state at finite temperatures, in Ru, Rh, Pd, Os and Pt. 5,6,7,8 In the present paper, we build on those results, also stimulated by some recent intriguing experimental results indicating unexpectedly low fractional conductance through Co, Pd and Pt nanocontacts and nanowires observed at room temperature 9,10,11 (note however that at low temperature, the uncontaminated break junctions fail to show fractional conductance and even nanowires in the case group III and IV transition metals. 10 ) Assuming that, as in the room temperature experiments, short nanowires could easily form at the nanocontact, we wish to explore the possible effects of strong correlations on the electronic structure of the wires, and if and in what way strong correlations might relate to these recent experimental results.…”

Section: Introductionmentioning

confidence: 95%

Effect of electron correlations in Pd, Ni, and Co monowires

Wierzbowska

Delin²,

Tosatti

2005

Phys. Rev. B

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We investigated the effect of mean-field electron correlations on the band electronic structure of Co, Ni, and Pd ultra-thin monatomic nanowires, at the breaking point, by means of densityfunctional calculations in the self-interaction corrected LDA approach (LDA+SIC) and alternatively by the LDA+U scheme. We find that adding static electron correlations increases the magnetic moment in Pd monowires, but has negligible effect on the magnetic moment in Co and Ni. Furthermore, the number of d-dominated conductance channels decreases somewhat compared to the LDA value, but the number of s-dominated channels is unaffected, and remains equal to one per spin.

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Section: Introductionmentioning

confidence: 95%

Effect of electron correlations in Pd, Ni, and Co monowires

Wierzbowska

Delin²,

Tosatti

2005

Phys. Rev. B

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“…Oshima et al [2], who worked in vacuum, at variable temperature, and with the possibility of an external magnetic field, found conductance steps in Ni nanocontacts preferentially near 2G 0 and 4G 0 at room temperature (RT) and zero field, near 4G 0 at 770 K and zero field, and near 3G 0 (occasionally near G 0 ) at RT with a field. Ono et al [3] reported again 2G 0 for Ni in zero field, and G 0 for Ni in a field. Recently, Rodrigues et al [4] observed 1 conductance quantum at RT and zero field in a Co atomic chain.…”

Section: Introductionmentioning

confidence: 99%

Ballistic conductance of magnetic Co and Ni nanowires with ultrasoft pseudopotentials

2004

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The scattering-based approach for calculating the ballistic conductance of open quantum systems is generalized to deal with magnetic transition metals as described by ultrasoft pseudo-potentials. As an application we present quantum-mechanical conductance calculations for monatomic Co and Ni nanowires with a magnetization reversal. We find that in both Co and Ni nanowires, at the Fermi energy, the conductance of d electrons is blocked by a magnetization reversal, while the s states (one per spin) are perfectly transmitted. d electrons have a non-vanishing transmission in a small energy window below the Fermi level. Here, transmission is larger in Ni than in Co.

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“…∆G = G 0 2 = e 2 h . Indeed, half-integer conductance quanta have been observed in both magnetic-and non-magnetic point contacts, particularly in external magnetic fields [43][44][45][46][47][48][49][50].…”

Section: Electron Transport Through Atomic-sized Contactsmentioning

confidence: 99%

Electron Transport in Magnetic Quantum Point Contacts

et al. 2012

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In recent years, the fabrication of novel building blocks for quantum computation-and spintronics devices gained significant attention. The ultimate goal in terms of miniaturization is the creation of single-atom functional elements. Practically, quantum point contacts are frequently used as model systems to study the fundamental electronic transport properties of such mesoscopic systems. A quantum point contact is characterised by a narrow constriction coupling two larger electron reservoirs. In the absence of a magnetic field, the conductance of these quantum point contacts is quantised in multiples of 2e 2 /h, the so-called conductance quantum (G 0 ). However, in the presence of magnetic fields the increased spin-degeneracy often gives rise to a deviation from the idealized behaviour and therefore leads to a change in the characteristic conductance of the quantum point contact. Herein, we illustrate the complex magnetotransport characteristics in quantum point contacts and magnetic heterojunctions. The theoretical framework and experimental concepts are discussed briefly together with the experimental results as well as potential applications.

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2e 2 /h to e2/h switching of quantum conductance associated with a change in nanoscale ferromagnetic domain structure

Abstract: Negative resistance contribution of a domain-wall structure in a constricted geometry

Cited by 129 publications

References 17 publications

Effect of electron correlations in Pd, Ni, and Co monowires

Effect of electron correlations in Pd, Ni, and Co monowires

Ballistic conductance of magnetic Co and Ni nanowires with ultrasoft pseudopotentials

Electron Transport in Magnetic Quantum Point Contacts

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