Features of the spectrum of exchange spin waves in planar Fe Ni/Dy/Fe Ni composites in the temperature range 4–300 K

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The spin-wave resonance in a magnetic planar composite FeNi/Dy/FeNi on exchange spin waves with a wave vector along the normal to the surface in the temperature range of 4–290 K. It is established that in the region of 90–290 K, resonant absorption of high-frequency field energy is observed on individual layers of FeNi; the coupling of ferromagnetic layers is manifested in the appearance of optical satellites in acoustic spin-wave modes, the field coordinates of optical satellites indicate a positive interlayer coupling. A single spin-wave spectrum of a planar nanocomposite is observed in the 4–85 K region, which made it possible to measure the values of spin-wave stiffness for it. The features of the spin-wave spectrum are due to modifications of the magnetic structure of Dy and a change in the temperature of the dominant interaction of REM/PM on interfaces.

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作者简介

R. Iskhakov

Kirensky Institute of Physics, Federal Research Center KSC SB RAS

Email: irina-vazhenina@mail.ru
俄罗斯联邦, Krasnoyarsk

I. Vazhenina

Kirensky Institute of Physics, Federal Research Center KSC SB RAS

Email: irina-vazhenina@mail.ru
俄罗斯联邦, Krasnoyarsk

S. Stolyar

Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences"

编辑信件的主要联系方式.
Email: irina-vazhenina@mail.ru

   

俄罗斯联邦, Krasnoyarsk

V. Yakovchuk

Kirensky Institute of Physics, Federal Research Center KSC SB RAS

Email: irina-vazhenina@mail.ru
俄罗斯联邦, Krasnoyarsk

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2. Fig. 1. SEM image of a three-layer film with tDy ≈ 10 nm.

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3. Fig. 2. Diagram illustrating the geometry of the experiment.

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4. Fig. 3. Angular dependence of the positions of resonance fields for a single-layer Fe20Ni80 film (a), experimental SWR spectrum at ΘH = 0° and T = 290 K (b), the inset shows the experimental values ​​of resonance fields from the square of the mode number, described by a linear dependence. Arabic numerals on the spectrum indicate the numbers of standing exchange modes.

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5. Fig. 4. Experimental SWR spectrum of the three-layer Fe20Ni80/Dy/Fe20Ni80 film at ΘH = 0° and T = 290 K (a) and the angular dependence of the resonance fields of the acoustic and optical peaks (b) in the FMR spectrum of the planar composite.

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6. Fig. 5. Angular dependence of the resonance field of the acoustic mode and the angular dependence of its intensity on the insert for the Fe20Ni80/Dy/Fe20Ni80 film (a), dependence of the values ​​of the resonance fields of the acoustic (b) and optical (c) peaks in the spectrum on the square of the mode number at ΘH = 0°.

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7. Fig. 6. Examples of individual microwave spectra of the three-layer system Fe20Ni80/Dy/Fe20Ni80 at different temperatures in the presence of interlayer exchange interaction in temperature region II.

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8. Fig. 7. Examples of microwave spectra of the three-layer system Fe20Ni80/Dy/Fe20Ni80 at 40 and 80 K with the formation of standing waves along the entire thickness of the planar system. The curves in fragments (a, b) and (d, e) differ in gain factors. The dependence of the intensities of the spectrum modes on the mode number (c, g) is demonstrated, as well as the linear dependence of the position of the resonance fields on the square of the mode number (d, h).

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9. Fig. 8. Temperature dependences of the difference in resonance fields between the acoustic and optical peaks (a) and their intensity (b).

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10. Fig. 9. Temperature dependence of the exchange rigidity for a single-layer Fe20Ni80 film and a three-layer Fe20Ni80/Dy/Fe20Ni80 film (a). Temperature dependence of the FMR line width for the acoustic and optical peaks at ΘH = 90° (b).

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11. Fig. 10. Scheme of magnetization orientations in a three-layer structure for two experimental geometries (FMR and SVR) and different magnetic orders of Dy (ferromagnetic and helical antiferromagnetic) at different temperatures.

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