Impact of Complex Permeability Measurements Up to Millimeter-Wave Frequency Range

Yabukami, S.; Nozawa, Kouhei; Tonthat, Loi; Okita, K.; Sai, Ranajit

doi:10.1109/tmag.2020.3011971

Cited by 14 publications

(14 citation statements)

References 11 publications

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“…In conclusion, we applied two different originally developed techniques, short-circuited MSL 10 , 15 , 19 and MSL-probe 11 , 20 methods, to a Ni 0.5 Zn 0.5 Fe 2 O 4 powder/polymer composite sheet prepared from high-quality Ni 0.5 Zn 0.5 Fe 2 O 4 ceramic powder. Although the two techniques are based on different experimental setups/systems, the dynamic permeability behaviors at GHz bands are essentially consistent.…”

Section: Discussionmentioning

confidence: 99%

“…For the dynamic permeability in the GHz-frequency region, (i) short-circuited MSL 10 , 15 , 19 and (ii) MSL-probe 11 , 20 methods were employed and their results were compared. In the case of (i), originally developed sample jigs were used to produce electromagnetic radiation of suitable frequencies to irradiate the sample for the measurements.…”

Section: Methodsmentioning

confidence: 99%

“…In method (ii), a “self-developed” probe composed of a MSL on a flexible substrate was used for the measurements 11 , 20 . The MSL probe was set on the surface of sheet sample with a gap between the sample and the probe of approximately 200 μm.…”

Section: Methodsmentioning

confidence: 99%

“…Similar to method (i), we applied sufficiently strong after the sheet sample was placed in the measurement device in the method (ii). This procedure enables us to saturate the specimen 20 . After that, the permeability measurements were carried out.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we evaluate the dynamic permeability behavior of ferrites under the irradiation of an electromagnetic wave of GHz frequency through two different originally developed measurement techniques, (i) short-circuited MSL 10 , 15 , 19 , and (ii) MSL-probe 11 , 20 methods. Our aim is to provide a comprehensive understanding of the dynamical magnetic behaviors of ferrites in the GHz region.…”

Section: Introductionmentioning

confidence: 99%

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Dynamical magnetic behavior of anisotropic spinel-structured ferrite for GHz technologies

Yasukawa

Nozawa

Tiittanen

et al. 2021

Sci Rep

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We have fabricated a high quality magnetic Ni0.5Zn0.5Fe2O4 ferrite powder/polymer composite sheet consisting of common and environmentally friendly elements only. The sheet was then tested for its dynamic permeability by irradiating with electromagnetic waves with frequencies up to 50 GHz. Two different originally developed methods were used for the high-frequency permeability measurements, a short-circuited microstrip line method and a microstrip line-probe method. It is challenging to measure the dynamic permeability of magnetic thin films/sheets beyond 10 GHz because of the low response signal from these materials. However, the two methods produced essentially equivalent results. In the frequency dependent permeability profile, the maximum position of the profile, $$\mu ^{\prime \prime }_{max}$$ μ max ″ , shifted towards higher frequencies upon increasing an applied (strong) static external magnetic field, $$H_{dc}$$ H dc . A linear relationship between $$\mu^ {\prime \prime }_{max}$$ μ max ″ and $$H_{dc}$$ H dc for the entire range of $$H_{dc}$$ H dc was observed even at small $$H_{dc}$$ H dc . In general, the spinel-structured Ni-based ferrites exhibit low magnetic anisotropy, but the present sample showed a uniaxial-anisotropic behavior in the parallel direction of the sheet. Our Ni0.5Zn0.5Fe2O4 powder/polymer composite sheet thus exhibits high performance at GHz frequencies, and should be applicable e.g. as an anisotropic electromagnetic wave-interference material.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamical magnetic behavior of anisotropic spinel-structured ferrite for GHz technologies

Yasukawa

Nozawa

Tiittanen

et al. 2021

Sci Rep

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Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

Arackal

Nozawa

Kahmei

et al. 2022

Applied Physics Letters

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We investigate the frequency dispersion of complex permeability in the GHz range in superparamagnetic nickel–zinc ferrite thin films with different Ni/Zn ratios using a microstrip probe. The films, comprising crystallites as small as 3 nm and deposited by a microwave-irradiation-assisted solvothermal method, exhibit the coexistence of two resonance characteristics—a ferromagnetic resonance peak ([Formula: see text]) at ∼2 GHz and a superparamagnetic resonance peak ([Formula: see text]) above 20 GHz, breaching Snoek's limit. The high value of [Formula: see text] is attributed to the high surface anisotropy and far-from-equilibrium distribution of cations in the lattice, while [Formula: see text] is attributed to the thermally driven superparamagnetic relaxation of ferrite nanocrystallites in the thin films. This work demonstrates the feasibility of employing superparamagnetic ferrite thin films so deposited as excellent CMOS-integrable magnetic components for high-speed and high-frequency electromagnetic device applications.

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Method for measuring magnetic susceptibility of magnetic nanoparticles up to millimeter-wave frequency range

et al. 2023

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A novel method for measuring the complex magnetic susceptibility of magnetic nanoparticles (MNPs) has been developed by a broadband microstrip line-type probe with a frequency range of up to 50 GHz. Two external orthogonal DC fields, Hhard and Heasy, were applied to change the susceptibility of MNPs (Streptavidin coated, 200 nmϕ, number of MNPs about 1010) based on magnetization switching theory. The susceptibility of MNPs in the liquid, solid state, and after biotin-avidin reaction with polymer beads (2 μmϕ, number of polymer beads about 108) was evaluated. A clear FMR frequency of MNPs and the same FMR frequency shift trend as Hhard changed was observed around 2–10 GHz in both liquid and solid states. The susceptibility of MNPs reached maximum when Hhard was 0.1 T which is approximately equal to Heasy (0.135 T). The maximum values of real and imaginary parts increased by a factor of 3.39 and 1.66 compared to when Hhard was 0. The obtained results indicate that the magnetic anisotropy was successfully controlled in the liquid and solid states of MNPs aggregate. Furthermore, after the biotin-avidin reaction of MNPs with polymer beads, the imaginary part of susceptibility showed a decreasing trend regardless of the increase in Hhard, and its half-width expanded by 35.1% at maximum when Hhard was 0.15 T.

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Impact of Complex Permeability Measurements Up to Millimeter-Wave Frequency Range

Cited by 14 publications

References 11 publications

Dynamical magnetic behavior of anisotropic spinel-structured ferrite for GHz technologies

Dynamical magnetic behavior of anisotropic spinel-structured ferrite for GHz technologies

Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

Method for measuring magnetic susceptibility of magnetic nanoparticles up to millimeter-wave frequency range

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