Size optimization for complex permeability measurement of magnetic thin films using a short-circuited microstrip line up to 30 GHz

Takeda, Shigeru; Naoe, Masayuki

doi:10.1016/j.jmmm.2017.10.025

Cited by 15 publications

(3 citation statements)

References 15 publications

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“…Commonly, the magnetization precessions in magn etic materials are in-phase (namely the acoustic mode) in the low-frequency regions [6,11], which is already familiar to researchers. In recent years, due to technical innovation, the applications of ferromagnetic resonance have developed rapidly towards the high-frequency regions [16][17][18][19], and ultrahigh ferromagnetic resonance is in urgent demand as it has a great advantage in the research of more advanced devices [20]. The magnetization precessions in magnetic materials are out-of-phase (namely the optical mode) in the high-frequency regions because of the contribution of exchange-coupling interaction [21,22].…”

Section: Introductionmentioning

confidence: 99%

Thickness-dependent resonance frequency of non-uniform procession mode in CoZr stripe-domain magnetic films

Ma¹,

Li²,

Wang³

et al. 2018

J. Phys. D: Appl. Phys.

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The magnetic properties of CoZr magnetic thin films with stripe domains are investigated. The nanocrystalline grain size of 21.2 nm of CoZr thin film was obtained by x-ray diffraction spectra. The rotatable stripe-domain structure of the samples can be clearly observed from the magnetic force microscopy images. From the results of the M-H loop, the typical loops with domain structure of the samples can also be seen. The saturation magnetic fields of the thin films increase as a function of stripe half period in static magnetic properties. In dynamic magnetic properties, we find two precession modes, which include one traditional uniform precession mode with the resonance peak position in the low-frequency band and the other as the non-uniform precession mode with the resonance peak position in the high-frequency band. The ferromagnetic resonance frequencies of the non-uniform procession mode, which are driven by the exchange coupling between adjacent domains, show a decrease in behavior from 5.11to 3.52 GHz in the zero-field dynamic permeability spectra with the stripe domain's half period increasing, while the ferromagnetic resonance frequencies of the uniform procession mode nearly remain constant. Similar behavior of exchange coupling can be found by analyzing the field-dependent dynamic permeability spectra of CoZr films, which indicates that the main contribution of the thickness-dependent resonance frequency is the exchange coupling between neighboring stripe domains.

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Section: Introductionmentioning

confidence: 99%

Thickness-dependent resonance frequency of non-uniform procession mode in CoZr stripe-domain magnetic films

Ma¹,

Li²,

Wang³

et al. 2018

J. Phys. D: Appl. Phys.

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“…We have already reported such measurement results for the 10-30 GHz band using short-circuited microstrip line test fixtures. 1,2) Improving the present fixtures is crucial for performing measurements at higher frequencies. On the other hand, a short-circuited coaxial line can also be used, without the need to consider the external noise due to a perfectly shielded structure.…”

Section: Introductionmentioning

confidence: 99%

Permeability Measurement up to 30 GHz of a Magnetically Isotropic Thin Film Using a Short-Circuited Coaxial Line

Takeda¹,

Kijima-Aoki

Masumoto

et al. 2019

J. Magn. Soc. Jpn.

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In this study, the high frequency permeability () and ferromagnetic resonance(FMR) phenomena of a thin film with a strong perpendicular magnetic anisotropy and in-plane magnetically isotropic properties was measured using the short-circuited coaxial line technique; the analyzed sample had a toroidal shape. A field method was used for the background correction, where a strong magnetic bias field was applied and removed. However, when using a short-circuited coaxial line, the  =1 condition cannot be achieved beyond a few ten GHz frequencies, whereas ferromagnetic resonance (denoted as FMR2) occurred because of the insufficient bias field. This resonance was compensated using the Landau-Lifshitz-Gilbert (LLG) equation, and the net -f properties without the bias field (denoted as FMR1) up to 30 GHz successfully extracted. Finally, a good agreement between the experimental results and the calculations based on the assumption of a magnetic multi-domain structure in FMR1 was achieved.

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“…For these films, the in-plane magnetization curves were measured with a vibrating sample magnetometer (VSM), as shown in Figs. 2(a)-2(c), and the relative permeabilities were measured with a short-circuited MSL measurement, 29) as shown in Fig. 2(d)-2(f).…”

mentioning

confidence: 99%

Crosstalk suppression of magnetic films covered by two parallel microstrip lines

Muroga

Endo

et al. 2019

Jpn. J. Appl. Phys.

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This paper demonstrated crosstalk suppressions of three-type noise suppressors using Co–Zr–Nb, Ni–Fe, and (Co–Pd)–CaF2 soft magnetic films. Simple two parallel microstrip lines (MSLs) with the line width of 95 μm were fabricated and used as a test bench to evaluate crosstalk suppression. The films placed on the MSLs suppressed both near- and far-end crosstalks around effective ferromagnetic resonance (FMR) frequencies. By applying an external magnetic field to the films, the FMR contribution to crosstalk suppressions was clarified. These results indicate usefulness of the magnetic films to increase a design freedom of IC chips and packages.

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Size optimization for complex permeability measurement of magnetic thin films using a short-circuited microstrip line up to 30 GHz

Cited by 15 publications

References 15 publications

Thickness-dependent resonance frequency of non-uniform procession mode in CoZr stripe-domain magnetic films

Thickness-dependent resonance frequency of non-uniform procession mode in CoZr stripe-domain magnetic films

Permeability Measurement up to 30 GHz of a Magnetically Isotropic Thin Film Using a Short-Circuited Coaxial Line

Crosstalk suppression of magnetic films covered by two parallel microstrip lines

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Size optimization for complex permeability measurement of magnetic thin films using a short-circuited microstrip line up to 30 GHz

Cited by 15 publications

References 15 publications

Thickness-dependent resonance frequency of non-uniform procession mode in CoZr stripe-domain magnetic films

Thickness-dependent resonance frequency of non-uniform procession mode in CoZr stripe-domain magnetic films

Permeability Measurement up to 30 GHz of a Magnetically Isotropic Thin Film Using a Short-Circuited Coaxial Line

Crosstalk suppression of magnetic films covered by two parallel microstrip lines

Contact Info

Product

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Size optimization for complex permeability measurement of magnetic thin films using a short-circuited microstrip line up to 30 GHz