Spin transport in different oxide phases of copper

Sha, Rongxin; Liu, Qinxi; Wang, Mengyi; Liu, Min; Peng, Yibo; Zhang, Ziyang; Zou, Ailiang; Xu, Yuekui; Qiu, Zhiyong

doi:10.1103/physrevb.103.024432

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…The open shell nature of CuO enables good spin conductivity, but the filled 3d orbital of Cu2O makes it a spin insulator. 11 Mixing the CuO and Cu2O stoichiometries, or increasing defect and vacancy sites, enables its magnetic moment to be systematically tuned for spintronic applications. 12 The photodynamics measured in bulk copper oxides also show significant differences.…”

Section: Introductionmentioning

confidence: 99%

Sub-Picosecond Photodynamics of Small Neutral Copper Oxide Clusters

Rotteger,

Jarman,

Sobol

et al. 2024

Preprint

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The ultrafast dynamics of neutral copper oxide clusters (CnOx, n < 5) are reported using femtosecond pump probe spectroscopy in the gas phase. The transient spectra recorded for each cluster demonstrates they relax on a 100s of fs timescale followed by a long-lived (>50 ps) response. Density functional theory calculations are performed to determine the lowest energy structures and spin states. Topological descripters for the excited states are calculated (time-dependent density functional theory) to relate the measured excited state dynamics to changes in the cluster’s electronic structure with increasing oxidation. Strong field ionization is demonstrated here to be a soft form of ionization and able to record transient signals for clusters previously determined to be unstable to nanosecond multiphoton ionization. The relative cluster stability is further demonstrated by signal enhancement/depreciation that is recorded through the synergy from the two laser pulses. Once the oxygen atoms exceed the number of copper atoms, a weakly bound superoxide O2 unit forms, exhibiting a higher spin state. All clusters that are not in the lowest spin configuration demonstrate fragmentation.

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Section: Introductionmentioning

confidence: 99%

Sub-Picosecond Photodynamics of Small Neutral Copper Oxide Clusters

Rotteger,

Jarman,

Sobol

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The open shell nature of CuO enables good spin conductivity, but the filled 3d orbital of Cu 2 O makes it a spin insulator. 11 Mixing the CuO and Cu 2 O stoichiometries, or increasing defect and vacancy sites, enables its magnetic moment to be systematically tuned for spintronic applications. 12 The photodynamics measured in bulk copper oxides also show significant differences.…”

Section: Introductionmentioning

confidence: 99%

Sub-picosecond photodynamics of small neutral copper oxide clusters

Rotteger,

Jarman,

Sobol

et al. 2024

Phys. Chem. Chem. Phys.

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“…自旋电子学是以电子的量子自由度自旋为核心对象的研究领域，以自旋为信息或能量载体的器件研制是自旋电子学的核心研究课题之一 [1][2][3][4] 。与传统的基于电荷的电子器件相比，自旋电子器件具有非易失、高速度和低热损等特点，使其有望成为下一代电子学器件的发展方向。自旋流的产生、输运及检测是自旋电子器件及其相关研发的基本问题 [5][6][7][8][9][10] 。其中，由于自旋流与传输介质之间具有复杂的相互作用，导致自旋流输运相关现象长期成为自旋流研究的难点及热点 [11][12][13][14][15] 。不同的材料及界面状态对自旋流传输影响的研究对开发新型自旋电子学器件具有重要意义。正如诺贝尔物理学奖得主Herbert Kroemer的名言 [16] "界面即器件"所述，在现代电子器件中界面对其功能和性能的主导作用毋庸置疑，对自旋电子器件亦然。针对自旋流传输现象，金属与金属界面处发生的自旋流反射、损耗和透射现象(图 1(a))已被大量研究。Kurt [17] 等在分析Cu/Pt与Cu/Pd界面的自旋输运时，观察到自旋损耗导致的自旋流不连续现象。Nguyen [18] 等发现在Co/Pt界面处具有较大的自旋翻转系数，暗示了自旋极化电流在铁磁层和铂金属层界面处存在无法忽视的耗散。Rojas-Sánchez [19,20] 成正比 [26,27] [29] )情况下的逆为进一步分析 YIG/Ni/Pt 三层和 YIG/Ni 双层器件中 Ni 层及 Pt 层分别对逆自旋霍尔电流 I ISHE 的贡献，我们首先基于自旋泵浦理论建立以下的等效电路模型 [24,30] 。对于 YIG/Ni 双层器件而言：…”

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Spin blocking effect at Ni/Pt heterojunction

Du¹,

Qiu²

2023

Acta Phys. Sin.

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Spin current, the flow of spin angular momentum, can carry and transport energy and/or information without generating Joule heating, which makes spin-based devices expected to be one of the potential aspects for the next generation information processing devices. It is important to investigate the generation, transport, and detection of spins for the development of spin-based devices, in which the spin transport and its related phenomena attract ongoing interests due to the complex interactions between spins and condensed matter systems. Here, spin transport phenomenon is studied at a heterojunction consisting of ferromagnetic metal nickel and nonmagnetic heavy metal platinum, where transport spins are found to be totally blocked. Two series of spin-pumping devices were made in this work which were the yttrium iron garnet (YIG)/Ni/Pt trilayer devices and the contrastive YIG/Ni bilayer devices. YIG was employed as the substrate and the spin-pump layer, on which nickel and platinum films were deposited by dc magnetron sputtering system. Spin currents were generated from YIG and injected into nickel layers by spin pumping technology. Voltage signals corresponding to the inverse spin Hall effect were detected and analyzed comparably for both YIG/Ni/Pt trilayer and YIG/Ni bilayer devices. It is found that the platinum layers in YIG/Ni/Pt trilayer devices only play as charge current shunting but do not contribute to the spin-charge conversion. This implies that the spin current can not transport through the Ni/Pt interface even when the nickel layer is as thin as 1 nm, which means in other words that the spin current is blocked at the Ni/Pt interface. Our result proposes a heterojunction that can block transport spins totally has never been discussed before, which may expand the views and trigger new functions for the development of spin-based devices.

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Spin transport in different oxide phases of copper

Cited by 5 publications

References 30 publications

Sub-Picosecond Photodynamics of Small Neutral Copper Oxide Clusters

Sub-Picosecond Photodynamics of Small Neutral Copper Oxide Clusters

Sub-picosecond photodynamics of small neutral copper oxide clusters

Spin blocking effect at Ni/Pt heterojunction

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