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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babitskii A. N., Belyaev B. A., Boev N. M., Skomorokhov G. V., Izotov A. V., Galeev R. G.
Заглавие : A magnetometer of weak quasi-stationary and high-frequency fields on resonator microstrip transducers with thin magnetic fields
Место публикации : Instrum. Exp. Tech.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 59, Is. 3. - P.425-432. - ISSN 00204412 (ISSN), DOI 10.1134/S0020441216030131
Примечания : Cited References: 23. - This study was performed within the framework of the State Job of the Ministry of Education and Science of the Russian Federation for the research at the Siberian Federal University in 2014 (project no. 3.528.2014K).
Предметные рубрики: Ferromagnetic-resonance
Films
Susceptibility
Anisotropy
Sensors
Trends
Аннотация: A high-sensitivity magnetometer for simultaneous measurements of three components of a weak quasi-stationary or high-frequency magnetic-field vector was developed and investigated. Microstrip structures that are based on irregular resonators serve as the magnetometer transducers. An anisotropic thin-film magnetic structure is used as the sensing element. This structure consists of two thin magnetic films that are prepared by magnetron sputtering of a Ni75Fe25 permalloy target and separated by a silicon monoxide layer. It is demonstrated that the transducer exhibits the maximum sensitivity, when the easy magnetization axis of the film structure is orthogonal to the polarization direction of the pumping microwave magnetic field in the microstrip resonator and at an optimal value of a constant magnetic bias field and its optimal deflection from the pumping-field polarization direction which is parallel to it. The magnetometer is characterized by a wide dynamic range of measured magnetic fields, 10–10–10–4 Т, and a wide frequency range, 10–1–105 Hz. © 2016, Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babitskii A. N., Belyaev B. A., Skomorokhov G. V., Izotov A. V., Galeev R. G.
Заглавие : A weak-field magnetometer based on a resonator microstrip transducer with thin magnetic films
Коллективы : Ministry of Education and Science of the Russian Federation, state order for Siberian Federal University [3.528.2014K]
Место публикации : Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 41, Is. 4. - P.324-327. - ISSN 1063, DOI 10.1134/S1063785015040021. - ISSN 10906533(eISSN)
Примечания : Cited References:12. - This study was supported by the Ministry of Education and Science of the Russian Federation, state order for Siberian Federal University in 2014, task no. 3.528.2014K.
Аннотация: A high-sensitivity magnetometer of weak quasi-stationary magnetic fields is developed and investigated. The magnetometer transducer is a microstrip resonator with an active medium from thin magnetic films prepared by magnetron sputtering of a Ni75Fe25 permalloy target. It is demonstrated that the transducer exhibits the maximum sensitivity not only in the optimal dc magnetic field, but also at the optimal deviation of this field from the rf pump field polarization direction. The magnetometer operates in a wide dynamic range of measured magnetic fields from 10−4 to 10−2 μT at frequencies of 10−1–105 Hz.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Izotov A. V., Skomorokhov G. V., Solovev P. N.
Заглавие : Experimental study of the magnetic characteristics of nanocrystalline thin films: the role of edge effects
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [18-32-00086]; Ministry of Science and Higher Education of the Russian Federation [3.1031.2017/PCh]
Место публикации : Mater. Res. Express. - 2019. - Vol. 6, Is. 11. - Ст.116105. - ISSN 2053-1591, DOI 10.1088/2053-1591/ab4456
Примечания : Cited References: 37. - This work was supported by RFBR according to the research project no. 18-32-00086 and by the Ministry of Science and Higher Education of the Russian Federation no. 3.1031.2017/PCh.
Предметные рубрики: FERROMAGNETIC-RESONANCE
ANISOTROPIES
ROUGHNESS
SUBSTRATE
Аннотация: Magnetic characteristics and their spatial distribution of magnetron sputtered nanocrystalline NiFe thin films of various compositions were investigated by ferromagnetic resonance (FMR) and magneto-optical Kerr effect microscopy. A sharp increase in the FMR line width and a strong deviation of the uniaxial magnetic anisotropy field were observed near the film edges. It was shown that the observed magnetic anisotropy behavior can be explained by assuming that besides the field-induced uniaxial magnetic anisotropy an additional source of the uniaxial anisotropy near the film edges exists, with the easy axis parallel to the edges. The possible origins of this additional contribution were discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Izotov A. V., Belyaev B. A., Boev N. M., Burmitskikh A. V., Skomorokhov G. V., Zharkov S. M., Solovev P. N.
Заглавие : Ferromagnetic resonance line broadening and shift effect in nanocrystalline thin magnetic films: Relation with crystalline and magnetic structure
Коллективы : 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]
Место публикации : J. Alloy. Compd. - 2022. - Vol. 900. - Ст.163416. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2021.163416. - ISSN 1873-4669(eISSN)
Примечания : 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
Предметные рубрики: SUSCEPTIBILITY
RIPPLE
ANISOTROPIES
ALLOYS
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Belyaev B. A., Boev N. M., Skomorokhov G. V., Izotov A. V.
Заглавие : Magnetic anisotropy and ferromagnetic resonance in inhomogeneous demagnetizing fields near edges of thin magnetic films
Колич.характеристики :12 с
Место публикации : J. Phys. Condens. Matter. - 2024. - Vol. 36, Is. 19. - Ст.195803. - ISSN 09538984 (ISSN), DOI 10.1088/1361-648X/ad258c. - ISSN 1361648X (eISSN)
Примечания : Cited References: 38
Аннотация: Using local ferromagnetic resonance spectroscopy, we have studied the magnetic properties near edges of thin tangentially magnetized permalloy films, in which a well-defined uniaxial magnetic anisotropy was induced perpendicular to one of the edges. In the experiment, two samples with thicknesses of 90 and 300 nm and with slightly different compositions were examined. To explain the magnetization dynamics near edges, we propose a simple yet effective model of a film in the form of a rectangular prism, which yields the modified Kittel formula for the resonance frequency. In this formula, the locally averaged distance-dependent demagnetizing field that emerges near the edges is included as an additional uniaxial anisotropy term. The measurements reveal that at a certain distance from the edge, the resulting (apparent) anisotropy, determined from the angular dependencies of the resonance field, almost vanishes. Moreover, its easy axis reorients to become parallel to the edge. The model predictions agree well with these results, proving that the main resonance mode behavior near the film edges can be accurately described by introducing additional effective uniaxial anisotropy, provided the measuring area is relatively large. However, for the thick (300 nm) sample, additional precession modes are also observed. These modes distort the angular dependence of the main mode, thus demonstrating the limitations of the model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Boev N. M., Izotov A. V., Skomorokhov G. V., Solovev P. N.
Заглавие : Magnetic properties of permalloy thin film edges
Коллективы : Ministry of Science and Higher Education of the Russian Federation [02, G25.31.0313]
Место публикации : Russ. Phys. J. - 2020. - Vol. 63, Is. 1. - P.16-22. - ISSN 1064-8887, DOI 10.1007/s11182-020-01997-6. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 23. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation (Project No. 02.G25.31.0313).
Предметные рубрики: ANISOTROPIES
Аннотация: The paper presents the results of ferromagnetic resonance (FMR) spectrometry of magnetic properties of nanocrystalline thin films obtained by magnetron sputtering of permalloy targets of various composition (NixFe1-x, x = 0.6-0.85). The behavior of the main magnetic properties of the thin film edges is analyzed. Near the film edges, not only the fluctuation of the uniaxial magnetic anisotropy field is observed, but also a drastic widening of the FMR line and the decrease in the effective saturation magnetization.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Izotov A. V., Skomorokhov G. V., Solovev P. N.
Заглавие : Micromagnetic analysis of edge effects in a thin magnetic film during local excitation of magnetization oscillations
Место публикации : Russ. Phys. J. - 2020. - Vol. 63, Is. 5. - P.837-843. - ISSN 1064-8887, DOI 10.1007/s11182-020-02106-3. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 19. - This research was performed with financial support of the Russian Foundation for Basic Research within the research project No. 18-32-00086
Предметные рубрики: ANISOTROPIES
SIMULATIONS
FIELDS
Аннотация: The method of numerical micromagnetic simulation was used to study the magnetization dynamics of a thin film with uniaxial magnetic anisotropy during ferromagnetic resonance (FMR) excitation in it on the local sites by a linearly polarized high-frequency magnetic field emitted from the 1 mm opening in the metallic screen of the transmission line. It was established that non-uniformities of demagnetizing fields emerging near the film edges lead not only to the change in the FMR field, but also to the change in the value and direction of the uniaxial anisotropy field. The distribution of non-uniformities of the magnetic anisotropy characteristics over the area of 60 nm thick permalloy film that was measured on the scanning FMR spectrometer agrees well with the micromagnetic simulation results. Demagnetizing fields were proved to be the main cause for the edge effects in magnetic films.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Izotov A. V., Babitskii A. N., Belyaev B. A., Boev, N. M., Skomorokhov G. V., Galeev R. G.
Заглавие : Microstrip construction of weak-field magnetometer
Коллективы : International scientific conference magnetic measurements
Место публикации : International Scientific Conference "Magnetic Measurements": program. - 2015. - Ст.P8-01
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Govorun I. V., Solovev P. N., Boev N. M., Afonin A. O., Ugryumov A. V., Skomorokhov G. V.
Заглавие : Microstrip frequency doublers based on a thin magnetic film
Коллективы : Ural Symposium on Biomedical Engineering, Radioelectronics and Information Technology
Место публикации : Ural Symposium on Biomedical Engineering, Radioelectronics and Information Technology, USBEREIT 2022: Proceedings: IEEE, 2022. - P.126-130. - , DOI 10.1109/USBEREIT56278.2022.9923409
Примечания : Cited References: 11. - This work is supported by the Russian Science Foundation under grant 19-72-10047
Аннотация: The article presents the results of measuring the generation of the second harmonic in a microstrip transmission line and in a quarter-wavelength stepped-impedance microstrip resonator with a thin permalloy magnetic film (Ni80Fe20 ). The measurements were carried out for three samples with different thicknesses – 50 nm, 75 nm and 100 nm, at an input signal excitation frequency of 1 GHz and maximum input power of ~3500 mW. It was shown that the level of the second harmonic rises as the TMF thickness increases. It was found that a 100-nm sample generates the second harmonic more efficiently due to the larger ΔH FMR and the larger amount of magnetic material involved in the process of nonlinear conversion of the input power. It was shown that the resonator-based frequency doubler has a conversion factor ~4500 times higher than that of the doubler based on the microstrip line due to the higher value of the loaded Q-factor. Therefore, a quarter-wavelength stepped-impedance microstrip resonator can be used as a frequency doubler.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Izotov A. V., Kiparisov S. Y., Skomorokhov G. V.
Заглавие : Synthesis and study of the magnetic characteristics of nanocrystalline cobalt films
Место публикации : Phys. Solid State. - 2008. - Vol. 50, Is. 4. - P.676-683. - ISSN 1063-7834, DOI 10.1134/S1063783408040136
Примечания : Cited References: 13
Предметные рубрики: FERROMAGNETIC-RESONANCE
SPECTROMETER
Аннотация: The effect of various technological factors on the main magnetic characteristics of nanocrystalline cobalt films obtained by chemical deposition is studied. The effective saturation magnetization, uniaxial anisotropy, coercive force, and other characteristics of local spots of films were measured using a scanning FMR spectrometer over the decimeter wavelength range. A technique for preparing substrates is developed, and the optimum technological conditions of thin-film synthesis are found making it possible to significantly decrease magnetic inhomogeneities across the area and thickness of samples. It is shown that one can significantly decrease the FMR linewidth and increase the magnetic permeability of films in a given microwave frequency range.
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