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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2019, Volume 110, Issue 12, Pages 799–805
DOI: https://doi.org/10.1134/S0370274X19240068
(Mi jetpl6070)
 

This article is cited in 8 scientific papers (total in 8 papers)

CONDENSED MATTER

Measurement of the stiffness of spin waves in amorphous ferromagnetic microwires by the small-angle neutron scattering method

S. V. Grigorievab, K. A. Pshenichnyiba, I. A. Barabanc, V. V. Rodionovac, K. A. Chichaic, A. Heinemannd

a Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, 188300 Russia
b St. Petersburg State University, St. Petersburg, 198504 Russia
c Immanuel Kant Baltic Federal University, Kaliningrad, 234041 Russia
d Helmholtz Zentrum Geesthacht, 21502 Geesthacht, Germany
Full-text PDF (528 kB) Citations (8)
References:
Abstract: The spin-wave stiffness of a ferromagnetic microwire in the form of an amorphous Fe$_{77.5}$Si$_{5.5}$B$_{15}$ strand with a diameter of $10\mu$m in a glass shell has been measured by the method of small-angle scattering of polarized neutrons. According to the quadratic dispersion relation for the ferromagnet, neutron scattering by spin waves is concentrated inside a cone with a cutoff angle $\theta_C$. The cutoff angle $\theta_C$ has been determined by comparing the antisymmetric contribution to the intensity of scattering of polarized neutrons and a model function for a magnetic field $H$ varied from $3.40$ to $41$ mT. The cutoff angle $\theta_C$ decreases according to the formula $\theta^2_C(H) = \theta_0^2-(g\mu_BH + \Delta)\theta_0/E_i$, where $\theta_0 = \hbar^2 / (2Am_n)$. The stiffness of spin waves and the energy gap in the spectrum of spin waves in the Fe$_{77.5}$Si$_{5.5}$B$_{15}$ ferromagnetic microwire at room temperature determined from the field dependence are meV $\theta^2_C(H)$ are $A =82(3)$ meV Å$^2$ and $\Delta=0.048(2)$ meV, respectively. It has been shown that this method for the measurement of the stiffness of spin waves can be successfully used in compact (with low and moderate fluxes) pulsed neutron sources based on accelerators.
Funding agency Grant number
Russian Science Foundation 19-12-00363
This work was supported by the Russian Science Foundation (project no. 19-12-00363).
Received: 20.10.2019
Revised: 13.11.2019
Accepted: 13.11.2019
English version:
Journal of Experimental and Theoretical Physics Letters, 2019, Volume 110, Issue 12, Pages 793–798
DOI: https://doi.org/10.1134/S0021364019240056
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: S. V. Grigoriev, K. A. Pshenichnyi, I. A. Baraban, V. V. Rodionova, K. A. Chichai, A. Heinemann, “Measurement of the stiffness of spin waves in amorphous ferromagnetic microwires by the small-angle neutron scattering method”, Pis'ma v Zh. Èksper. Teoret. Fiz., 110:12 (2019), 799–805; JETP Letters, 110:12 (2019), 793–798
Citation in format AMSBIB
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\paper Measurement of the stiffness of spin waves in amorphous ferromagnetic microwires by the small-angle neutron scattering method
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  • This publication is cited in the following 8 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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    Письма в Журнал экспериментальной и теоретической физики Pis'ma v Zhurnal Иksperimental'noi i Teoreticheskoi Fiziki
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