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Pseudo-anomalous size-dependent electron-phonon interaction in graded energy band: Solving the Fano paradox / M. Tanwar, D. K. Pathak, A. Chaudhary [et al.] // J. Phys. Chem. Lett. - 2021. - Vol. 12, Is. 8. - P. 2044-2051, DOI 10.1021/acs.jpclett.1c00217. - Cited References: 77 . - ISSN 1948-7185
Кл.слова (ненормированные):
Fano parameters -- Local variations -- Longitudinal variations -- Nanocrystallite size -- Quantum confinement effects -- Quantum size effects -- Raman line shapes -- Raman spectromicroscopy -- Electron-phonon interactions
Аннотация: Quantum size effects on interferons (electron-phonon bound states), confined in fractal silicon (Si) nanostructures (NSs), have been studied by using Raman spectromicroscopy. A paradoxical size dependence of Fano parameters, estimated from Raman spectra, has been observed as a consequence of longitudinal variation of nanocrystallite size along the Si wires leading to local variations in the dopants' density which actually starts governing the Fano coupling, thus liberating the interferons to exhibit the typical quantum size effect. These interferons are more dominated by the effective reduction in dopants' density rather than the quantum confinement effect. Detailed experimental and theoretical Raman line shape analyses have been performed to solve the paradox by establishing that the increasing size effect actually is accompanied by receding Fano coupling due to the weakened electronic continuum. The latter has been validated by observing a consequent variation in the Raman signal from dopants which was found to be consistent with the above conclusion.

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Держатели документа:
Materials and Device Laboratory, Discipline of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institut fur Festkorperphysik, Leibniz Universitat Hannover, Appelstr. 2, Hannover, D-30167, Germany
Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
Department of Materials Science and Engineering, Hanbat National University, Daejeon, 34158, South Korea
Centre for Advanced Electronics, Indian Institute of Technology Indore, Simrol, 453552, India

Доп.точки доступа:
Tanwar, M.; Pathak, D. K.; Chaudhary, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Pfnur, H.; Sharma, A.; Ahn, B.; Lee, S.; Kumar, R.
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    Ferromagnetic resonance line broadening and shift effect in nanocrystalline thin magnetic films: Relation with crystalline and magnetic structure / A. V. Izotov, B. A. Belyaev, N. M. Boev [et al.] // J. Alloy. Compd. - 2022. - Vol. 900. - Ст. 163416, DOI 10.1016/j.jallcom.2021.163416. - Cited References: 52. - The reported study was funded by RFBR, the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund and JSC "NPP "Radiosviaz", project number 20-42-242901 and was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement number 075-11-2019-054 dated 22.11.2019.; The electron microscopy investigations were conducted in the SFU Joint Scientific Center whose infrastructure was supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation . - ISSN 0925-8388. - ISSN 1873-4669
   Перевод заглавия: Уширение линии ферромагнитного резонанса и эффект сдвига в нанокристаллических тонких магнитных пленках: Связь с кристаллической и магнитной структурой

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical
Рубрики:
SUSCEPTIBILITY
   RIPPLE
   ANISOTROPIES
   ALLOYS
Кл.слова (ненормированные):
Nanocrystallite -- Magnetization ripple -- Ferromagnetic resonance (FMR) -- Two-magnon scattering process -- Micromagnetic simulation
Аннотация: With the rapid development of telecommunication technologies and highly integrated electronic devices, researchers show great interest in nanocrystalline soft magnetic thin films with unique characteristics for microwave applications. An important direction of the current research in this field is the study of high-frequency magnetization dynamics that directly depends on the damping processes in a magnetic medium. This paper reports on the effect of sharp broadening and shift of the ferromagnetic resonance (FMR) line revealed experimentally in a 40-nm-thick nanocrystalline permalloy (Fe20Ni80) thin film at a frequency of about 5 GHz. The effect arises only in films with crystallite size exceeding some critical value Dcr. The micromagnetic simulation demonstrates that exchange and dipolar interactions between randomly oriented crystallites form in the film a quasiperiodic magnetic structure with a characteristic wavelength in the range from 36 nm to 3.3 µm. An analysis of the two-magnon scattering model and simulation results shows that the formed magnetic structure provides the energy transfer from uniform magnetization oscillations (uniform FMR) to spin waves, which results in an additional energy dissipation channel and, consequently, sharp FMR line broadening. A theoretical estimate of the critical crystallite size Dcr based on this model yields a value of ~14.3 nm for 40-nm-thick Fe20Ni80 films.

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Держатели документа:
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, 50-38 Akademgorodok, Akademgorodok 5038, Russia.

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Burmitskikh, A. V.; Бурмитских, Антон Владимирович; Skomorokhov, G. V.; Скоморохов, Георгий Витальевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Solovev, P. N.; Соловьев, Платон Николаевич; RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund; JSC "NPP "Radiosviaz" [20-42-242901]; Ministry of Science and Higher Education of the Russian Federation [075-11-2019-054, FSRZ-2020-0011]
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