Spin-flip electron-phonon scattering
WebAug 17, 2024 · First, there is a thermally-excited electron spin current that traverses the interface. Second, there is a thermally-excited magnon spin current that is converted at the interface into an electronic spin current in the normal metal by interfacial electron–magnon spin-flip scattering. WebAug 2, 2012 · Figure 5 Analytical (solid lines) and numerical results (-× - lines) of spin-flip matrix element as a function of q = k 1 − k 2 along five different scattering directions, and with s ∥ [001].Each direction is represented by a different line color. The electron resides in the z valley and its spin is orientated along the valley axis. The analytical results for TA, …
Spin-flip electron-phonon scattering
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WebOct 27, 2024 · Therefore, the contribution of electron-electron spin-flip scattering to the ultrafast demagnetization of ferromagnets after an ultrashort laser excitation is … WebEnter the email address you signed up with and we'll email you a reset link.
WebAug 6, 2024 · The resonance can occur in the presence of a strong spin–phonon coupling when the two-level spin systems split by the Zeeman energy absorb phonon and subsequently emit another phonon of... WebDec 6, 2013 · The demagnetization time τ M and the demagnetization rate d M / d t due to spin-flip electron-phonon scattering is calculated for fcc Ni and bcc Fe. Thereby, the electronic states and phononic states are calculated ab initio. We find that the demagnetization rates for fcc Ni and bcc Fe are too small to explain experimental …
WebJan 21, 2024 · In pure crystalline ferromagnets, one of the main microscopic mechanism of spin relaxation is the electron-phonon (el-ph) driven spin-flip, or Elliott-Yafet, scattering. Unexpectedly, recent experiments with ferro- and ferrimagnetic alloys have shown different dynamics for the different sublattices. ... Thus, these results evidence that the ... WebSep 1, 1996 · From the dependence of the detection signal on the magnetic field in phonon spectroscopy and phonon pulse measurements it is concluded that quasiparticle-phonon transitions can be accompanied by a spin flip. {copyright} {ital 1996 The American Physical Society.} Authors: Lang, J; Eisenmenger, W [1]; Fulde, P [2]
WebThese scattering mechanisms are: Umklapp phonon-phonon scattering, phonon-impurity scattering, phonon-electron scattering, and phonon-boundary scattering. Each scattering mechanism can be characterised by a relaxation rate 1/ which is the inverse of the corresponding relaxation time.
WebJan 13, 2024 · We show that the spin-flip and momentum relaxation mechanisms are governed by distinct microscopic processes. Our work enables precise predictions of spin-phonon relaxation times in a wide range of materials, providing microscopic insight into spin relaxation and guiding the development of spin-based quantum technologies. Received 3 … bishop barnesWebNov 1, 2005 · As observed in Fig. 1, these spin-flip transition rates vary between 10 0 and 10 4 s −1, values that are significantly smaller than those reported for the charge relaxation with phonon emission via RM scattering [5] in CdS SQD's (10 9 –10 10 s −1).A very long spin-flip relaxation time leads to longer spin coherence, and may be of great importance for … bishop baraga school iron mountainWebJan 29, 2016 · While [ 9] introduced the name of EY spin dynamics as a mechanism for demagnetization, it assumed incoherent spin–flip scattering where the angular momentum is transferred to the phonons. In [ 10 – 14 ], the assumptions of Yafet for semiconductors have essentially been taken over. dark gray cabinet stainWebDec 14, 2013 · Spin relaxation due to polar optical phonon scattering in semiconductors was investigated. The relaxation of the electron spin was found to increase with increasing the … bishop barneyWebOct 19, 2024 · Instead, photon energy is transferred to the system in the form of an increased electronic and/or atomic temperature. This process can excite electron-hole pairs, lattice phonons and magnons, which will non-selectively spin-flip scatter with the electrons responsible for magnetisation, modifying their angular momenta [15,16,17,18]. bishop barnabas lekganyane snake picturesWebSpin-flip Raman scattering (SFRS) is an example of electronic process in a much broader field of inelastic light scattering. Unlike conventional Raman scattering by optical and … dark gray cabinets light gray wallsWebOct 19, 2024 · Instead, photon energy is transferred to the system in the form of an increased electronic and/or atomic temperature. This process can excite electron-hole … bishop bar and bistro howden