Aluminum Nano-polycrystalline Substance with Ferromagnetics and Application to High-Frequency Core Inductor
Journal of Electrical and Electronic Engineering
Volume 5, Issue 3, June 2017, Pages: 98-103
Received: Apr. 11, 2017;
Accepted: Apr. 22, 2017;
Published: Jun. 21, 2017
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Mitsuru Inada, Faculty of Engineering Science, Kansai University, Osaka, Japan
Yukio Iida, Faculty of Engineering Science, Kansai University, Osaka, Japan
Taku Saiki, Faculty of Engineering Science, Kansai University, Osaka, Japan
Shinichirou Masuda, Faculty of Engineering Science, Kansai University, Osaka, Japan
It has showed in experiments that aluminum nano-polycrystalline substances are ferromagnetic. A magnetic hysteresis curve measured by SQUID suggested the ferromagnetism. Al bulk is normally thought to be non-magnetic body. Authors also fabricated core inductors using Al nano-polycrystalline substances and measured the inductances of cored inductors with frequency dependence. Al nano-polycrystalline substance was fabricated by sintering Al nanopaste with Al nanoparticles. Al nanoparticles were prepared by using laser ablation in liquid. The structures and components of the sintered Al nano-polycrystalline substances were analyzed by SEM and EDX. It has been shown that inductor using Al nano-polycrystalline substance with low volume resistivity, which is the same order of metal, works at low frequencies below 500 Hz, while inductor using substance with high volume resistivity works at high frequency of 5 MHz. Our analysis of Al nano-polycrystalline substance with high volume resistivity revealed relative permittivity of 7 at frequency of 1 MHz. It has been expected that these inductors to work at frequency of a few GHz because the magnetic resonance frequency of the Al nano-polycrystalline substances were evaluated to be 5.6 GHz and the high volume resistivity results in suppressing the eddy currents.
Aluminum Nano-polycrystalline Substance with Ferromagnetics and Application to High-Frequency Core Inductor, Journal of Electrical and Electronic Engineering.
Vol. 5, No. 3,
2017, pp. 98-103.
J. I. Martın, J. Nogues, K. Liu, J. L. Vicent, I. K. Schuller, “Ordered magnetic nanostructures: fabrication and properties”, J. of Magnetism and Magnetic Materials, 2003, 256, (1), pp. 449-501.
Function Investigation Committee of Nanoscale Magnetic Material.: “Nanostructured magnetic materials -physics, function, design-”, (Kyoritsu Publishing, Tokyo, JAPAN, 2010), Chapter 1 and 2.
Y. Shimada, M. Yamaguti, S. Okamoto, O. Kitakami, G. W. Qin, K. Oikawa, “Enhanced initial permeability of composite assembly of ferromagnetic particles”, J. Magn. Soc. Jpn., 2006, 30, pp.540-544 [in Japanese].
R. Tang, M. Mizuguchi, H. Wang, R. Yu, K. Takanashi, “Strong temperature dependence of magnetoresistance in Co-C granular thin films”, IEEE Trans. Magn., 2010, 46, pp.2144-2147.
S. Yoshida, S. Ando, Y. Shimada, K. Suzuki, K. Nomura, K. Fukamichi, “Crystal structure and microwave permeability of very thin Fe–Si–Al flakes produced by microforging”, J. Appl. Phys., 2003, 93, pp.6659-6661.
V. Korenivski, ”GHz magnetic film inductors”, J. of Magnetism and Magnetic Materials, 2000, 215-216, pp.800-806.
Y. Gao, S. Z. Zardareh, X. Yang, T. X. Nan, Z. Y. Zhou, M. Onabajo, M. Liu, A. Aronow, K. Mahalingam, B. M. Howe, G. J. Brown, and N. X. Sun, “Significantly Enhanced Inductance and Quality Factor of GHz Integrated Magnetic SolenoidInductors With FeGaB/Al2O3 Multilayer Films”, IEEE Trans. on Electron Devices, 2014, 61(5), pp.1470-1475.
P. Marín, D. Cortina, and A. Hernando, ”Electromagnetic Wave Absorbing Material Based on Magnetic Microwires”, IEEE Trans. on Magnetics, 2008, 44(11), pp.3934-3937.
G. Howatt, R. Breckenridge,J. Brownlow, “Fabrication of Thin Ceramic Sheets for Capacitors”, J. Am. Ceram. Soc., 1947, 30, pp.237-242.
G. Herzer, “Grain structure and magnetism of nanocrystalline ferromagnets”, IEEE Transactions on Magnetics, 1989, 25, (5). pp. 3327-3329.
Lou, L., Hou, F. C., Wang, Y., Li, H. L., Li, W., Guo, D. F., Li, X. H. and Zhang, X. Y.: ‘Texturing for bulk α-Fe/Nd2Fe14B nanocomposites with enhanced magnetic properties’, J. Magn. Magn. Mater., 2014, 352, pp.45-48.
K. Saitow and T. Yamamura, “Effective Cooling Generates Efficient Emission: Blue, Green, and Red Light-Emitting Si Nanocrystals”, J. Phys. Chem. C, 2009,113(19), pp.8465-8470.
V. Švrček, T. Sasaki, Y. Shimizu, and N. Koshizaki, “Blue Luminescent Silicon Nanocrystals Prepared by Ns Pulsed Laser Ablation in Water”, Appl. Phys. Lett., 2006, 89, 213113-1-3.
I. Umezu, A. Sugimura, M. Inada, T. Makino, K. Matsumoto, and M. Takata, "Formation of Nanoscale Fine-Structured Silicon by Pulsed Laser Ablation in Hydrogen Background Gas", Phys. Rev. B, 2007, 76, 045328-1-10.
T. Saiki, T. Okada, K. Nakamura, T. Karita, Y. Nishikawa, and Y. Iida, “Air Cells Using Negative Metal Electrodes Fabricated by Sintering Pastes with Base Metal Nanoparticles for Efficient Utilization of Solar Energy”, Int. J. of Energy Science, 2012, 2(6), pp. 228-234.
T. Saiki, Y. Iida, K. Ri, M. Yoshida,Y. Koga, “Electrical property of laser-sintered nanopastes with reduced metal nanoparticles prepared by laser ablation in liquids”, Adv. Materials, 2014, 3(6), pp.75-88.
T. Saiki and Y. Iida, "Fabrication of Sintered Si Nano-polycrystalline with Reduced Si Nanoparticles and Property of Photoluminescence in Visible Regime for Sintered Si Nano-polycrystalline by Violet Light Excitation", American Journal of Nano Research and Applications, 2015, 3(5), pp.82-88.
M. Sato, and Y. Ishii, “Simple and approximate expressions of demagnetizing factors of uniformly magnetized rectangular rod and cylinder”, J. Appl. Phys., 1989, 66, pp.983-98.