Spin Pumping and Torque Statistics in the Quantum Noise Limit
Virtanen, P., & Heikkilä, T. (2017). Spin Pumping and Torque Statistics in the Quantum Noise Limit. Physical Review Letters, 118(23), Article 237701. https://doi.org/10.1103/PhysRevLett.118.237701
Julkaistu sarjassa
Physical Review LettersPäivämäärä
2017Tekijänoikeudet
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.
We analyze the statistics of charge and energy currents and spin torque in a metallic nanomagnet coupled to a large magnetic metal via a tunnel contact. We derive a Keldysh action for the tunnel barrier, describing the stochastic currents in the presence of a magnetization precessing with the rate Ω. In contrast to some earlier approaches, our result is valid for an arbitrary ratio of ℏΩ/kBT. We illustrate the use of the action by deriving spintronic fluctuation relations, the quantum limit of pumped current noise, and consider the fluctuations in two specific cases: the situation with a stable precession of magnetization driven by spin transfer torque, and the torque-induced switching between the minima of a magnetic anisotropy. The quantum corrections are relevant when the precession rate exceeds the temperature T, i.e., for ℏΩ≳kBT.
Julkaisija
American Physical SocietyISSN Hae Julkaisufoorumista
0031-9007Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/27056896
Metadata
Näytä kaikki kuvailutiedotKokoelmat
Rahoittaja(t)
Suomen AkatemiaRahoitusohjelmat(t)
Huippuyksikkörahoitus, SALisätietoja rahoituksesta
This work was supported by the MIUR-FIRB2013-Project Coca (Grant No. RBFR1379UX), the Academy of Finland Centre of Excellence program (Project No. 284594) and the European Research Council (Grant No. 240362-Heattronics).Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk
Fermin, Remko; van Dinter, Dyon; Hubert, Michel; Woltjes, Bart; Silaev, Mikhail; Aarts, Jan; Lahabi, Kaveh (American Chemical Society (ACS), 2022)Since the discovery of the long-range superconducting proximity effect, the interaction between spin-triplet Cooper pairs and magnetic structures such as domain walls and vortices has been the subject of intense theoretical ... -
Toward Quaternary QCA : Novel Majority and XOR Fuzzy Gates
Akbari-Hasanjani, Reza; Sabbaghi-Nadooshan, Reza; Haghparast, Majid (Institute of Electrical and Electronics Engineers (IEEE), 2022)As an emerging nanotechnology, quantum-dot cellular automata (QCA) has been considered an alternative to CMOS technology that suffers from problems such as leakage current. Moreover, QCA is suitable for multi-valued logic ... -
Spin and charge currents driven by the Higgs mode in high-field superconductors
Silaev, Mikhail A.; Ojajärvi, Risto; Heikkilä, Tero T. (American Physical Society, 2020)The Higgs mode in superconducting materials describes slowly decaying oscillations of the order parameter amplitude. We demonstrate that in superconductors with a built-in spin-splitting field the Higgs mode is strongly ... -
Coupling the Higgs mode and ferromagnetic resonance in spin-split superconductors with Rashba spin-orbit coupling
Lu, Yao; Ojajärvi, Risto; Virtanen, P.; Silaev, M. A.; Heikkilä, Tero T. (American Physical Society (APS), 2022)We show that the Higgs mode of superconductors can couple with spin dynamics in the presence of a static spin-splitting field and Rashba spin-orbit coupling. The Higgs-spin coupling dramatically modifies the spin susceptibility ... -
Spectral analysis and quantum chaos in two-dimensional nanostructures
Luukko, Perttu (University of Jyväskylä, 2015)This thesis describes a study into the eigenvalues and eigenstates of twodimensional (2D) quantum systems. The research is summarized in four scientific publications by the author. The underlying motivation for this work ...
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.