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Development of magnetic hyperthermia coil system for wide treatment temperature area on neck and breast cancer models
Aoi Yamazaki;Takayuki Kagami;Akihiro Kuwahatat;Shin Yabukami
IEEE Transactions on Magnetics
Year: 2025 | Early Access Article |
Magnetic hyperthermia (MH), based on heat generation through the magnetic relaxation mechanisms of magnetic nanoparticles (MNPs) under alternating magnetic fields (AMF), is a promising cancer treatment technology due to its non-invasiveness compared to other methods such as radiation, microwave irradiation, and chemotherapy. To enhance the therapeutic effect by expanding the area heated to the tre...Show More
Evaluation of cytokeratin in lymph node metastasis using magnetic nanoparticles and protein aggregates
Shin Yabukami;Toru Murayama;Koki Kaneko;Amane Ban;Loi Ton That;Yohei Ozawa;Hiroshi Okamoto;Takashi Kamei;Miyuki Tanaka;Yoshikazu Tanaka;Takaaki Abe
IEEE Transactions on Magnetics
Year: 2025 | Early Access Article |
We aim to apply protein sensors to rapid intraoperative diagnosis of lymph node metastasis. In the present study, cytokeratin, which is a biomarker of lymph node metastasis, was bound to protein G-coated magnetic nanoparticles (FG beads, 180 nmϕ) via primary antibody (Anti-Cytokeratin AE1/AE3 Antibody (Monoclonal Mouse IgG1)). The increase of the protein aggregated the magnetic nanoparticles and e...Show More
Parallel Line Type Permeameter for Thick Magnetic Material to Reduce the Error of Demagnetizing Field
2024 IEEE International Magnetic Conference - Short papers (INTERMAG Short papers)
Year: 2024 | Conference Paper |
We have developed a new high-frequency magnetic permeability evaluation method to suppress measurement errors due to demagnetizing fields of thick magnetic materials using parallel wires. The characteristic impedance of the parallel wires was designed to be around $\mathbf{50}\ \mathbf{\Omega}$. The magnetic field inside the sample has almost in-plane components, and even in thick samples, the per...Show More
An Ultra-Broadband Magnetic Susceptivity Evaluation of Magnetic Nanoparticle and Protein
Shin Yabukami;Junichi Honda;Toru Murayama;Loi Tonthat;Kazuhiko Okita
2024 IEEE International Magnetic Conference - Short papers (INTERMAG Short papers)
Year: 2024 | Conference Paper |
A new broad bandwidth detection of the GDF15 protein (Growth Differentiation Factor-15), which utilizes the broad bandwidth observation up to 67 GHz, has been proposed. We prepared the sandwich-type bound method using a primary and secondary antibody with additional magnetic nanoparticles on an Au film. A DC field application enhanced sharp ferromagnetic resonance, which improved the signal-to-noi...Show More
Parallel Line Type Permeameter for Thick Magnetic Material to Reduce the Error of Demagnetizing Field
We have developed a new high-frequency permeability evaluation method to suppress measurement errors due to demagnetizing fields of thick magnetic materials sandwiched by parallel wires. The magnetic field inside the sample has almost in-plane components, and even in thick samples, the perpendicular component of the magnetic field was reduced, and measurement errors due to demagnetizing fields wer...Show More
Enhanced Magneto-Optical Properties of Au–Fe₃O₄ Heterodimer Nanoparticles Synthesized With Triiron Dodecacarbonyl
This study presents a pioneering and efficient method for synthesizing Au–Fe3O4 heterodimer nanoparticles (NPs) with enhanced magneto-optical properties via a thermal decomposition route. By utilizing triiron dodecacarbonyl (Fe3(CO)12) as a safer alternative to the commonly used toxic iron pentacarbonyl (Fe(CO)5), a near 100% production yield was achieved through optimization of the molar ratio of...Show More
AC Magnetic Field Detection of Coplanar Line Type Thin Film Magnetic Field Sensor with Optimized Narrow Slits
Ryota Suzuki;Masaya Sakamoto;Tomoya Ishihara;Junichi Honda;Shin Yabukami
2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)
Year: 2023 | Conference Paper |
We have proposed coplanar line type thin-film magnetic field sensor with narrow slits. The slit is employed to flow more carrier current on the signal line by improving the impedance matching. Several sensors having 6, 10, 26, 36, and 50 μm slit widths were fabricated and evaluated from the phase and the amplitude of the transmission coefficient (S21) and reflection coefficient (S11) measured by t...Show More
Ultrasmall Fe3O4@Au Composite Nanoparticles with Different Sizes of Fe3O4 for Magnetic Hyperthermia
2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)
Year: 2023 | Conference Paper |
We reported the synthesis and characterization of ultrasmall iron oxide/gold composite nanoparticles (Fe3O4@Au NPs) with different sizes of Fe3O4, and the evaluation of their heating efficiency for potential use in magnetic hyperthermia application. The Fe3O4 NPs were synthesized using the thermal decomposition method with three types of sizes of ~5 nm, ~10 nm, and ~13 nm. Gold was then deposited ...Show More
Ultrafast Heating Rate of Ultrasmall Gold-coated Iron Oxide Magnetic Nanoparticles by Ferromagnetic Resonance
2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)
Year: 2023 | Conference Paper |
In this study, we experimentally demonstrated an ultrafast heating rate of ultrasmall gold-coated iron oxide magnetic nanoparticles (Fe3O4@Au NPs) by the ferromagnetic resonance (FMR) effect. Using the constructed setup, the ferromagnetic resonance and temperature increment of NPs under FMR were evaluated. The resonant frequency of Fe3O4@Au NPs and their uncoated Fe3O4 NPs was several GHz and incr...Show More
Magnetic Susceptibility-Based Detection of Fusobacterium Nucleatum in Human Saliva
Kazuhiko Okita;Youcheng Pu;Loi Tonthat;Toru Murayama;Shin Yabukami;Yohei Ozawa;Seji Asamitsu;Hiroshi Okamoto;Takashi Kamei
This letter presents an innovative method for rapid and precise measurement of bacteria in liquid samples for point-of-care testing. The method utilizes the bacteria concentration-dependent ac susceptibility of magnetic nanoparticles, allowing for efficient and practical bacterial detection. The ac susceptibility of the magnetic nanoparticles/bacteria aggregate exhibits a decrease proportional to ...Show More
Ultrasmall Fe₃O₄@Au Composite Nanoparticles With Different Sizes of Fe₃O₄ for Magnetic Hyperthermia
IEEE Transactions on Magnetics
Cited by: Papers (5)
We present the synthesis and characterization of ultrasmall iron oxide/gold composite nanoparticles (Fe3O4@Au NPs) with different Fe3O4 sizes, along with an evaluation of their heating efficiency for potential use in magnetic hyperthermia (MH) applications. The Fe3O4 NPs of approximately 5, 10, and 13 nm were synthesized using the thermal decomposition method, followed by gold deposition via the r...Show More
Ultrafast Heating Rate of Ultrasmall Gold-Coated Iron Oxide Magnetic Nanoparticles by Ferromagnetic Resonance
IEEE Transactions on Magnetics
Cited by: Papers (6)
In this study, we demonstrated experimental findings on the ultrafast heating capabilities of ultrasmall gold-coated iron oxide magnetic nanoparticles (MNPs) (Fe3O4 @ Au NPs) utilizing the ferromagnetic resonance (FMR) effect. A lab-made setup was employed to evaluate the FMR and temperature increment of NPs under FMR conditions. The resonant frequency of both Fe3O4 @ Au NPs and their uncoated Fe3...Show More
Ferromagnetic Resonance Heating of Magnetic Nanoparticles Resovist for Biomedical Applications
Akihiro Kuwahata;Weronika Szawro;Takayuki Kagami;Masaharu Takahashi;Shin Yabukami
IEEE Transactions on Magnetics
Cited by: Papers (2)
Ferromagnetic resonance (FMR)-based magnetic energy dissipation potentially generates effective heating for cancer therapy in magnetic hyperthermia. We demonstrated the FMR characteristics of normal/customized Resovist (particle sizes of 60 and 16 nm) for biomedical applications and revealed the bias magnetic field-dependent FMR spectrum in the range of 1–10 GHz under 0–2000 Oe. Moreover, an impro...Show More
Wide Microstrip Line Type Probe With Slits and Permeability Evaluation of Thick Magnetic Material
M. Sakamoto;A. Mashiko;Y. Watanabe;K. Sakuma;K. Okita;S. Yabukami;K. Chatani
We have developed a new microstrip line type probe with a wide conductor having some slits to eliminate the measurement error of the demagnetizing effect in thick samples. The slits enhanced the homogeneity of the high-frequency current in the wide direction of the microstrip conductor, which resulted in the application of a uniform high-frequency magnetic field to the sample. Complex relative per...Show More
Simplified Fabrication of Magnetic Nanoparticles With Directly Adsorbed Antibodies for Bacteria Detection
Tsuyoshi Yoneyama;Akihiro Kuwahata;Toru Murayama;Loi Tonthat;Shin Yabukami;Yuya Sato;Yuji Teramura;Wakako Ikeda-Ohtsubo;Tomoyuki Ogawa
IEEE Transactions on Magnetics
Cited by: Papers (10)
Antigen–antibody reactions with conjugated magnetic nanoparticles (MNPs) are widely used for detecting viruses, bacteria, and proteins. In this study, we proposed a novel method for adsorbing antibodies directly on the surface of MNPs without coating any proteins. MNPs (Fe3O4; average size 4 nm) were synthesized by a thermal decomposition method using oleyl amine as a surfactant, the fabricated MN...Show More
A Detection and Analysis of Fusobacterium Utilizing Changes in the Magnetic Properties of Magnetic Nanoparticles-Antibody–Antigen Aggregates
S. Yabukami;T. Murayama;S. Takahashi;S. Ohno;J. Washio;N. Takahashi
IEEE Transactions on Magnetics
Cited by: Papers (5)
A quick and easy method to detect Fusobacterium species has been developed to utilize magnetic nanoparticles’ magnetic response and is applied by switching magnetic fields. The bacterium can be detected without the washing process. The magnetic nanoparticles and Fusobacterium species are bound by an antigen–antibody reaction and aggregated into a spherical shape using a needle-shaped magnetic yoke...Show More
Simultaneous Evaluation of Permeability and Permittivity Using a Flexible Microstrip Line-Type Probe up to 67 GHz
S. Yabukami;C. Iwasaki;K. Okita;K. Nozawa;S. Takahashi;K. Chatani
IEEE Transactions on Magnetics
Cited by: Papers (6)
Complex relative permeability and permittivity were evaluated simultaneously in the band of 100 MHz–67 GHz using a flexible microstrip line-type probe. In principle, the probe can evaluate the permeability and permittivity of electromagnetic materials regardless of size. The measured permeability and permittivity were obtained from the transmission coefficient ( $S_{21}$ ). Since $S_{21}$ under ...Show More
Impact of Complex Permeability Measurements Up to Millimeter-Wave Frequency Range
IEEE Transactions on Magnetics
Cited by: Papers (13)
A highly sensitive microstrip-line-type probe using a flexible substrate was developed to measure thin-film permeability continuously up to the millimeter-wave frequency range (over 30 GHz). The probe enables broad bandwidth and highly sensitive permeability measurements without sample size limitations. The complex permeability of the CoFeB film (45 mm × 25 mm and 0.5 μm in thickness), CoNbZr film...Show More
Development of an Automatic Localization System of Magnetic Particles for Hyperthermia Therapy
IEEE Transactions on Magnetics
Cited by: Papers (9)
Magnetic hyperthermia is a promising cancer therapy gaining great interest in recent years. In this therapy, in addition to magnetic particles, important elements include techniques for detecting the position and temperature of magnetic particles in a tumor region in determining the effectiveness of therapeutic heating. In previous studies, we developed a low invasive heating and wireless temperat...Show More
Development of the New Measurement Techinque for Spin Dynamics of Magnetic Thin Films
2018 IEEE International Magnetics Conference (INTERMAG)
Year: 2018 | Conference Paper |
we proposed a new measurement technique, which employs a microstripe line probe to detect ferromagnetic resonance (FMR) spectra for a magnetic thin film either with tensile stress or stress free, which enables simultaneous evaluation. Furthermore, the damping constants (α) of these films were evaluated from FMR spectrum with stress free. These measurements were performed at room temperature. These...Show More
Wireless Magnetic Position-Detection System With Four Excitation Coils
Yutaro Osaki;Shuichiro Hashi;Shin Yabukami;Hiroyasu Kanetaka;Kazushi Ishiyama
For tracking position or motion of objects in small or shielded spaces, our wireless position-detection system using an LC resonant marker is considered to be effective. Generally, detection of the accurate position of the marker is difficult when reduction of the S/N ratio occurs due to the marker posture. To solve this problem, we propose a system with four excitation coils to generate four-dire...Show More
Magnetoimpedance Characteristics on Micromachined Thin-Film Elements Less Than 100-Micrometers Length
2016 International Conference of Asian Union of Magnetics Societies (ICAUMS)
Year: 2016 | Conference Paper |
Magnetoimpedance (MI) sensor has higher sensitivity, thus it is expected to be applied to the medical applications and the nondestructive evaluation, etc. With the demands for the detection of local and micro area, the miniaturization of the sensor element is strongly required. Though a thin-film MI element contributes to the miniaturization of the sensor elements, the demagnetizing effect becomes...Show More
Thin-film type magneto-impedance (MI) elements having widths and thicknesses of several micrometers and lengths less than 100 μm in a rectangular shape were fabricated to reduce the demagnetizing effect. Triangular-type MI elements with sensing parts less than 100 μm in length were also fabricated to facilitate near-field detection with a higher spatial resolution. Rectangular-type elements with w...Show More
Highly Sensitive Thin-Film Magnetic Field Sensor Meandering Coplanar Line
IEEE Transactions on Magnetics
Cited by: Papers (3)
A very sensitive thin-film sensor was developed using a meandering coplanar line fabricated from Sr33Ti16O51 film (3 μm thick), amorphous Co85Nb12Zr3 film (1 mm×2.45 mm, 0.3-2 μm thick), and Cu/Cr film (2/0.1 μm). The deposited SrTiO film enhanced the sensitivity of a magnetic held sensor, a phase change of more than 30°/Oe and a gain of over -40 dB being achieved simultaneously. The maximum phase...Show More
Highly Sensitive Coplanar Line Thin-Film Sensor Using SrTiO Film
Hiroaki Uetake;Toshiya Kawakami;Shin Yabukami;Tetsuya Ozawa;Nobukiyo Kobayashi;Ken Ichi Arai
IEEE Transactions on Magnetics
Cited by: Papers (6)
A very sensitive thin-film sensor was developed using a coplanar line fabricated from SrTiO (Sr33Ti16O51) film (0.5, 1, 2, 3, and 6 $\mu $ m thick), amorphous CoNbZr film (5 $\mu $ m thick), and Cu/Cr film (4 $\mu $ m/0.2 $\mu $ m). The deposited SrTiO film had high permittivity of around 31. This film enhanced the sensitivity of the magnetic field sensor, a phase change of more than 100°/Oe a...Show More
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