Effect of bipolarons on spin polarized transport in magnetic permeated sublayer of organic spin device

Jiang, Lina; Zhang, Yubin; Dong, Shuai

doi:10.7498/aps.64.147104

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…In general, they show both classical and quantum properties, such as magnetization hysteresis, quantum coherence, spin tunneling of the magnetization, and quantum phase interference. [14][15][16][17][18][19] When such molecules are inserted into a device where a current flows, then the exchange interaction between the itinerant electrons and the SMMs can be used to write in and read out information, [20][21][22][23] namely it can be used to realize molecular electronics with spins, i.e., molecular spintronics. [24,25] Importantly, the typical length scale of these SMM junctions is rather close to that of materials used to perform quantum information processing with nuclear magnetic resonance (NMR) [26][27][28] or electron spinresonance (ESR).…”

Section: Introductionmentioning

confidence: 99%

Spin resonance transport properties of a single Au atom in S–Au–S junction and Au–Au–Au junction

Wang¹,

Li²

2016

Chinese Phys. B

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The spin transport properties of S-Au-S junction and Au-Au-Au junction between Au nanowires are investigated with density functional theory and the non-equilibrium Green's function. We mainly focus on the spin resonance transport properties of the center Au atom. The breaking of chemical bonds between anchor atoms and center Au atom significantly influences their spin transmission characteristics. We find the 0.8 eV orbital energy shift between anchor S atoms and the center Au atom can well protect the spin state stored in the S-Au-S junction and efficiently extract its spin state to the current by spin resonance mechanism, while the spin interaction of itinerant electrons and the valence electron of the center Au atom in the Au-Au-Au junction can extract the current spin information into the center Au atom. Fermi energy drift and bias-dependent spin filtering properties of the Au-Au-Au junction may transform information between distance, bias, and electron spin. Those unique properties make them potential candidates for a logical nanocircuit.

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Section: Introductionmentioning

confidence: 99%

Spin resonance transport properties of a single Au atom in S–Au–S junction and Au–Au–Au junction

Wang¹,

Li²

2016

Chinese Phys. B

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Precise Regulation of Carrier Concentration in Thermoelectric BiSbTe Alloys via Magnetic Doping

Wei

Wang

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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The Bi 2 Te 3 -based alloy is the best commercial thermoelectric material around room temperature, although it is extremely difficult to further improve its thermoelectric performance. In this work, we demonstrate that magnetic doping is an effective strategy to regulate the thermoelectric performance of p-type Bi 0.5 Sb 1.5 Te 3 . According to our experiments, it is much more difficult for ferromagnetic Fe/Co to enter the Bi 0.5 Sb 1.5 Te 3 lattice in comparison with diamagnetic Pb, which can be understood by the "like dissolves like" rule. At the same doping content, Fe and Co provide much lower hole carriers than Pb due to their larger carrier thermal activation energies, indicating that Fe and Co as dopants are very applicable for the fine regulation of the carrier concentration. The Fe/Co-doped samples have higher Seebeck coefficients but less carrier mobilities than the Pb-doped sample since the doped magnetic atoms induce additional carrier scattering. Beyond the solid solubility limit, excess Fe/ Co represents as the impurity, which can maintain a high carrier concentration due to the metal−semiconductor contact. Finally, the zT values of ∼1.05 and 1.15 near room temperature have been achieved for the samples with 1.71 at. % Co and 1.80 at. % Fe, respectively.

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Influence of thermal treatment on the ionic valence and the magnetic structure of perovskite manganites La0.95Sr0.05MnO3

Li-Qian¹,

Qi²,

Li³

et al. 2016

Acta Phys. Sin.

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In traditional views, the magnetic ordering of oxides may be explained using magnetic superexchange (SE) or double exchange (DE) interaction models. Both models are based on an assumption that the valences of all oxygen ions be -2. For example, both La and Mn in LaMnO3 are assumed to be trivalent, in which antiferromagnetic spin structure is explained using the SE interaction between Mn3+ cations mediated by oxygen anions. In La1-xSrxMnO3, there exists a part of Mn4+ cations with the content ratio of Mn4+/Mn3+ being x/(1-x), in which spin structure and electronic transport properties are explained by DE interaction. However, there is a part of monovalent oxygen ions existing in oxides. Cohen [Nature 358 136] has calculated the densities of states for valence electrons in the perovskite oxide BaTiO3 using density functional theory. Results indicate that the average valence of Ba is +2, being the same as that in the traditional one, but the average valences of Ti and O are +2.89 and -1.63 respectively, agreeing with the results obtained using ionicity investigation [Rev. Mod. Phys. 42 317] and X-ray photoelectron spectra (XPS) analysis, but different from the conventional results +4 and -2. In this paper, three samples with the nominal composition La0.95Sr0.05MnO3 are prepared by different thermal-treatments. Likewise, there are only Mn2+ and Mn3+ cations, but no Mn4+ cations in La0.95Sr0.05MnO3, a result obtained by XPS analysis, and the average valence of Mn in La0.95Sr0.05MnO3 samples increases with increaseing thermal-treatment. Although the crystal structures of the samples are the same, the magnetic moments per formula are obviously different. This magnetic structure cannot be explained using the conventional SE and DE interaction models. Using the O 2p itinerant electron model for spinel ferrites proposed recently by our group, we can explain this magnetic structure. The variation trend of the average valences of Mn cations calculated using the magnetic moments per formula of the samples at 10 K, is in accordance with the experiment results of XPS. The O 2p itinerant electron model is based on an assumption that there is a part of monovalent oxygen ions in the oxides, which is the fundamental difference from SE and DE interaction models.

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Effect of bipolarons on spin polarized transport in magnetic permeated sublayer of organic spin device

Cited by 3 publications

References 31 publications

Spin resonance transport properties of a single Au atom in S–Au–S junction and Au–Au–Au junction

Spin resonance transport properties of a single Au atom in S–Au–S junction and Au–Au–Au junction

Precise Regulation of Carrier Concentration in Thermoelectric BiSbTe Alloys via Magnetic Doping

Influence of thermal treatment on the ionic valence and the magnetic structure of perovskite manganites La0.95Sr0.05MnO3

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