Spin superfluid Josephson quantum devices

Takei, So; Tserkovnyak, Yaroslav; Mohseni, Masoud

doi:10.1103/physrevb.95.144402

Cited by 12 publications

(10 citation statements)

References 41 publications

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“…Heterostructures composed of an insulating magnet and a non-magnetic conductor (N) enable conversion of the magnonic spin current in the former to the electronic in the latter, thereby allowing for their integration with conventional electronics. In conjunction with the technological pull, these low dissipation systems have provided a fertile playground for fundamental physics [5][6][7].…”

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confidence: 99%

“…w, x → 0, lim T →0 S(0) → 2 I sz [Eqs. (6) and (7)] such that the dynamical spin correction factor S D → 1.…”

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confidence: 99%

“…[13], and detailed calculations demonstrating equivalence between Eqs. (1) and (6). [27] We emphasize that this expression is restricted to the z-component of spin, and may not be employed for the full spin vector.…”

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confidence: 99%

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Spin Pumping and Shot Noise in Ferrimagnets: Bridging Ferro- and Antiferromagnets

Kamra

Belzig

2017

Phys. Rev. Lett.

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A combination of novel technological and fundamental physics prospects has sparked a huge interest in pure spin transport in magnets, starting with ferromagnets and spreading to antiferro-and ferrimagnets. We present a theoretical study of spin transport across a ferrimagnet|non-magnetic conductor interface, when a magnetic eigenmode is driven into a coherent state. The obtained spin current expression includes intra-as well as cross-sublattice terms, both of which are essential for a quantitative understanding of spin-pumping. The dc current is found to be sensitive to the asymmetry in interfacial coupling between the two sublattice magnetizations and the mobile electrons, especially for antiferromagnets. We further find that the concomitant shot noise provides a useful tool for probing the quasiparticle spin and interfacial coupling.Introduction. The quest for energy efficient information technology has driven scientists to examine unconventional means of data transmission and processing. Pure spin current transport in magnetic insulators has emerged as one of the most promising candidates [1][2][3][4]. Heterostructures composed of an insulating magnet and a non-magnetic conductor (N) enable conversion of the magnonic spin current in the former to the electronic in the latter, thereby allowing for their integration with conventional electronics. In conjunction with the technological pull, these low dissipation systems have provided a fertile playground for fundamental physics [5][6][7].Commencing the exploration with ferromagnets (Fs), the focus in recent years has been shifting towards antiferromagnets (AFs) [8][9][10] due to their technological advantages [11]. While a qualitative understanding of some aspects of AFs, such as spin pumping [12,13], has been borrowed without much change from Fs, the leading order effects in several other phenomena, such as spin transfer torque [13] and magnetization dynamics [8], bear major qualitative differences. Thus, several phenomena, already known for Fs, are now being generalized for AFs [14].Although ferrimagnets (Fs) have been the subject of comparatively fewer works [7,15,16], their high potential is undoubted. The additional complexity of their magnetic structure comes hand in hand with broader possibilities and still newer phenomena. The spin Seebeck effect [17][18][19] in an F with magnetic compensation temperature has unveiled rich physics due to the interplay between the opposite spin excitations in the magnet [16]. Further studies have asserted an important role of the interfacial coupling between the magnet and the conductor [20]. While yttrium iron garnet is a ferrimagnet and has been the subject of several studies [1,3,4,[21][22][23], it is often treated as a ferromagnet on the grounds that only the low energy magnons are important [24].In this Letter, we evaluate the spin pumping current (I sz ) and the concomitant spin current shot noise [S(Ω)] in a F-N bilayer [ Fig. 1(a)], when one of the F eigenmodes is driven into a coherent sate. A two-sublattice mode...

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confidence: 99%

“…w, x → 0, lim T →0 S(0) → 2 I sz [Eqs. (6) and (7)] such that the dynamical spin correction factor S D → 1.…”

mentioning

confidence: 99%

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Spin Pumping and Shot Noise in Ferrimagnets: Bridging Ferro- and Antiferromagnets

Kamra

Belzig

2017

Phys. Rev. Lett.

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“…14 Recently we have proposed a spin-based macroscopic quantum device that is realizable and controllable with current spintronics technologies. 15 The work proposed a "magnetic phase qubit", which stores quantum information in the orientational degree of freedom of a macroscopic magnetic order parameter and offers the first alternative qubit of the macroscopic type to superconducting qubits. In principle, the upper bound for the operational temperature of a magnetic quantum device is set by magnetic ordering temperatures, which are typically much higher than the critical temperatures of superconducting Josephson devices.…”

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confidence: 99%

Quantum control of topological defects in magnetic systems

Takei

Mohseni

2018

Phys. Rev. B

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Energy-efficient classical information processing and storage based on topological defects in magnetic systems have been studied over past decade. In this work, we introduce a class of macroscopic quantum devices in which a quantum state is stored in a topological defect of a magnetic insulator. We propose non-invasive methods to coherently control and readout the quantum state using ac magnetic fields and magnetic force microscopy, respectively. This macroscopic quantum spintronic device realizes the magnetic analog of the threelevel rf-SQUID qubit and is built fully out of electrical insulators with no mobile electrons, thus eliminating decoherence due to the coupling of the quantum variable to an electronic continuum and energy dissipation due to Joule heating. For a domain wall sizes of 10 − 100 nm and reasonable material parameters, we estimate qubit operating temperatures in the range of 0.1 − 1 K, a decoherence time of about 0.01 − 1 µs, and the number of Rabi flops within the coherence time scale in the range of 10 2 − 10 4 .

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“…We can thus envision applications that may simply not be possible with traditional batteries, resulting in low-dissipation operations (including energy storage, logic, and memory) based purely on spin dynamics. Finally, it may be interesting to think of the extensions to (macroscopic) quantum information processing based on magnetic insulators [33].…”

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confidence: 99%

Energy Storage via Topological Spin Textures

Tserkovnyak

Xiao

2018

Phys. Rev. Lett.

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We formulate an energy-storage concept based on the free energy associated with metastable magnetic configurations. Despite the active, magnetic region of the battery being electrically insulating, it can sustain effective hydrodynamics of spin textures, whose conservation law is governed by topology. To illustrate the key physics and potential functionality, we focus here on the simplest quasi-one-dimensional case of planar winding of the magnetic order parameter. The energy is stored in the metastable winding number, which can be injected electrically by an appropriately tailored spin torque. Due to the nonvolatility and the endurance of magnetic systems, the injected energy can be stored essentially indefinitely, with charging/discharging cycles that do not degrade over time.arXiv:1808.02461v1 [cond-mat.mes-hall]

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Spin superfluid Josephson quantum devices

Cited by 12 publications

References 41 publications

Spin Pumping and Shot Noise in Ferrimagnets: Bridging Ferro- and Antiferromagnets

Spin Pumping and Shot Noise in Ferrimagnets: Bridging Ferro- and Antiferromagnets

Quantum control of topological defects in magnetic systems

Energy Storage via Topological Spin Textures

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