Nonlinear spin torque, pumping, and cooling in superconductor/ferromagnet systems

Ojajärvi, Risto; Manninen, Juuso; Heikkilä, Tero T.; Virtanen, Pauli

doi:10.1103/physrevb.101.115406

Cited by 12 publications

(8 citation statements)

References 51 publications

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“…They are the building blocks of the modern digital technology revolution owing to their ability to manipulate electrical currents with exponential dependencies on the control parameters [1]. Motivated by this success story, enormous amounts of research efforts have been devoted to enhancing the functionalities of the next generation of nanoelectronic devices by exploiting the various ways to manipulate the electrical currents on the level of single electrons [2][3][4], the spin degree of freedom [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], the thermal properties of mesoscopic structures [20][21][22][23], as well as the mutual coupling of charge, spin, and energy modes [24,25].…”

Section: Introductionmentioning

confidence: 99%

Topological charge, spin, and heat transistor

2021

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Spin pumping consists in the injection of spin currents into a nonmagnetic material due to the precession of an adjacent ferromagnet. In addition to the pumping of spin the precession always leads to pumping of heat, but in the presence of spin-orbital entanglement it also leads to a charge current. We investigate the pumping of charge, spin, and heat in a device where a superconductor and a quantum spin Hall insulator are in proximity contact with a ferromagnetic insulator. We show that the device supports two robust operation regimes arising from topological effects. In one regime, the pumped charge, spin, and heat are quantized and related to each other due to a topological winding number of the reflection coefficient in the scattering matrix formalism, translating to a Chern number in the case of Hamiltonian formalism. In the second regime, a Majorana zero mode switches off the pumping of currents owing to the topologically protected perfect Andreev reflection. We show that the interplay of these two topological effects can be utilized so that the device operates as a robust charge, spin, and heat transistor.

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Section: Introductionmentioning

confidence: 99%

Topological charge, spin, and heat transistor

2021

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“…Though the static properties of the SFS structures are well studied both theoretically and experimentally, much less is known about the magnetic dynamics of these systems [28,[49][50][51][52][53][54][55][56][57][58][59][60] Different type of very simple and harmonic precessions of the magnetic moment were demonstrated in Ref. [61].…”

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confidence: 99%

Locking of magnetization and Josephson oscillations at ferromagnetic resonance in $φ_0$ junction under external radiation

Abdelmoneim,

Shukrinov,

Kulikov

et al. 2022

Preprint

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We demonstrate the locking by external electromagnetic radiation of magnetic precession in the ϕ0 Josephson junction through Josephson oscillations in the region of ferromagnetic resonance. This leads to a step in the dependence of the magnetization on the bias current, the position of which is determined by the radiation frequency and the shape of the resonance curve. In junctions with a strong spin-orbit coupling, states with negative differential resistance appear on the IVcharacteristic, resulting in an additional locking step. A detailed study of the time dependence of voltage and magnetization and their Fourier transforms shows that the corresponding oscillations have the same frequency as the oscillations at the first step, but they have a different amplitude and different dependence on the radiation frequency. This makes it possible to control not only the frequency, but also the amplitude of the magnetic precession in the locking region. It opens up unique perspectives for the control and manipulation of magnetic moment in hybrid systems such as anomalous Josephson junctions.

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“…Most of the experimental [13,15,16,[29][30][31][32][33][34] and theoretical works studying magnetization dynamics in superconductor/ferromagnet systems focus on the FMR properties [35][36][37][38][39][40][41] and spin torques [42,43]. Here we consider the spin battery effect [5] that is the static spin accumulation of Bogoliubov quasiparticles in a superconductor (SC) generated either by the coherent FMR drive or by the thermal magnons in the adjacent FI.…”

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confidence: 99%

Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems

et al. 2021

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We develop a theory of the spin battery effect in superconductor/ferromagnetic insulator (SC/FI) systems taking into account the magnetic proximity effect. We demonstrate that the spin-energy mixing enabled by the superconductivity leads to the enhancement of spin accumulation by several orders of magnitude relative to the normal state. This finding can explain the recently observed giant inverse spin Hall effect generated by thermal magnons in the SC/FI system. We suggest a nonlocal electrical detection scheme which can directly probe the spin accumulation driven by the magnetization dynamics. We predict a giant Seebeck effect converting the magnon temperature bias into the nonlocal voltage signal. We also show how this can be used to enhance the sensitivity of magnon detection even up to the single-magnon level.

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Nonlinear spin torque, pumping, and cooling in superconductor/ferromagnet systems

Cited by 12 publications

References 51 publications

Topological charge, spin, and heat transistor

Topological charge, spin, and heat transistor

Locking of magnetization and Josephson oscillations at ferromagnetic resonance in $φ_0$ junction under external radiation

Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems

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