Journal of the Magnetics Society of Japan最新文献_第10页

Perpendicular Magnetic Anisotropy in Full-Heusler Co2FeSi Alloy and MgO Bilayers Co2FeSi合金和MgO双分子层的垂直磁各向异性

Journal of the Magnetics Society of Japan Pub Date : 2019-11-01 DOI: 10.3379/msjmag.1911r004

Y. Takamura, Y. Stutler, E. Matsushita, K. Shinohara, Taiji Suzuki, S. Nakagawa

引用次数: 5

Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate 利用磁包覆技术提高铝板轻型无线传输线圈的传输效率

Journal of the Magnetics Society of Japan Pub Date : 2019-11-01 DOI: 10.3379/msjmag.1911r005

S. Endo, Mitsuhide Sato, Y. Bu, T. Mizuno

{"title":"Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate","authors":"S. Endo, Mitsuhide Sato, Y. Bu, T. Mizuno","doi":"10.3379/msjmag.1911r005","DOIUrl":"https://doi.org/10.3379/msjmag.1911r005","url":null,"abstract":"As a power supply method for electric vehicles (EVs), wireless power transmission is attracting attention because it allows to charge stationary EVs seamlessly and is not associated with cable-related problems such as forgetting to charge or leakage1-3). Wireless power transmission for EVs operates at a high frequency of 85 kHz. Since a high-frequency loss typically occurs in wireless power transfer coils4), the litz copper wire (LCW) with good high-frequency characteristics is generally used in wireless power transfer coils for EVs5-11). To improve the fuel efficiency of EVs, a weight reduction of the embedded coil is highly desirable. Furthermore, a coil that is inexpensive and easy to manufacture is required. To meet these requirements, we examined a relatively facile fabrication of a coil using an aluminum plate. However, the aluminum plate (AP) coil has a large AC resistance due to the proximity effect12). At the same time, this resistance can be reduced by coating the coil with a magnetic layer13-15). Therefore, we coated the AP coil with a magnetic composite material using a low-loss amorphous alloy powder achieving a magnetically coated plate (MCP) coil. In this study, the optimal magnetic composite material was analyzed using the finite element method (FEM). Furthermore, the impedance characteristics of the coil were evaluated, and the transmission efficiencies of the AP and MCP coils were measured using the double-LCC resonant circuit. (b) (a)","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81542511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of Cap-Layer on the Structure of FePt Alloy Thin Film Formed on VN and VC Underlayers 帽层对VN和VC底层形成FePt合金薄膜结构的影响

Journal of the Magnetics Society of Japan Pub Date : 2019-11-01 DOI: 10.3379/msjmag.1911r002

Tomoki Shimizu, M. Ohtake, M. Futamoto, F. Kirino, N. Inaba

引用次数: 1

Representation of Magnetic Hysteresis Phenomena Under Inverter Excitation in a Circuit Simulator Using Coupling Analysis of Electricity and Magnetism 电路模拟器中逆变器励磁磁滞现象的电、磁耦合分析

Journal of the Magnetics Society of Japan Pub Date : 2019-11-01 DOI: 10.3379/msjmag.1911r001

A. Yao, T. Funaki, T. Hatakeyama

引用次数: 1

Permeability Measurement up to 30 GHz of a Magnetically Isotropic Thin Film Using a Short-Circuited Coaxial Line 利用同轴短路线测量30 GHz以下磁各向同性薄膜的磁导率

Journal of the Magnetics Society of Japan Pub Date : 2019-09-01 DOI: 10.3379/MSJMAG.1909R001

S. Takeda, H. Kijima-Aoki, H. Masumoto, H. Suzuki

引用次数: 1

Heating Performance of Soft-heating Element with LC-booster for Invasive Hyperthermia Therapy lc -助推器软加热元件在有创热疗中的加热性能

Journal of the Magnetics Society of Japan Pub Date : 2019-09-01 DOI: 10.3379/MSJMAG.1909R002

T. Takura, S. Kajiwara, H. Kikuchi, H. Matsuki

引用次数: 0

Suppression of Heat Generation in Magnetic Stimulation Coil Applied for Treating Dysphagia 抑制磁刺激线圈发热治疗吞咽困难

Journal of the Magnetics Society of Japan Pub Date : 2019-07-01 DOI: 10.3379/MSJMAG.1907R003

M. Hitoshi, H. Kagaya, S. Izumi, K. Yashima, T. Takagi

{"title":"Suppression of Heat Generation in Magnetic Stimulation Coil Applied for Treating Dysphagia","authors":"M. Hitoshi, H. Kagaya, S. Izumi, K. Yashima, T. Takagi","doi":"10.3379/MSJMAG.1907R003","DOIUrl":"https://doi.org/10.3379/MSJMAG.1907R003","url":null,"abstract":"The authors are developing magnetic stimulation coils for use in the treatment of dysphagia. The prototype coil manufactured in our previous research can induce large contraction of the suprahyoid muscles, which should be trained for normal swallowing. In this study, the heat generation in the coil during magnetic stimulation is investigated and suppressed. A numerical analysis showed that the main cause of the generated heat is the eddy current in the coil conductor induced by magnetic flux from the tip of the magnetic core. The analysis also showed that a parallel coil with a cross connection has an ideal current distribution in the coil conductor and thus best suppresses heat generation during magnetic stimulation. The heat-suppressing coil has parallel divided coil conductors and an appropriate connection between the conductors to level the current in each conductor. Moreover, measurements of the temperature rise in prototype coils during magnetic stimulation confirm that heat generation can be greatly suppressed by dividing the conductor and using an appropriate connection between the divided conductors.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77451481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Fabrication of L10-FeNi films by denitriding FeNiN films 反氮化FeNiN薄膜制备L10-FeNi薄膜

Journal of the Magnetics Society of Japan Pub Date : 2019-07-01 DOI: 10.3379/MSJMAG.1907R002

K. Ito, M. Hayashida, M. Mizuguchi, T. Suemasu, H. Yanagihara, K. Takanashi

引用次数: 4

Impact of Curie Temperature Variation on Bit Error Rate in Heat-Assisted Magnetic Recording 居里温度变化对热辅助磁记录误码率的影响

Journal of the Magnetics Society of Japan Pub Date : 2019-07-01 DOI: 10.3379/MSJMAG.1907R001

T. Kobayashi, Y. Nakatani, Y. Fujiwara

{"title":"Impact of Curie Temperature Variation on Bit Error Rate in Heat-Assisted Magnetic Recording","authors":"T. Kobayashi, Y. Nakatani, Y. Fujiwara","doi":"10.3379/MSJMAG.1907R001","DOIUrl":"https://doi.org/10.3379/MSJMAG.1907R001","url":null,"abstract":"Heat-assisted magnetic recording (HAMR) is a promising candidate as a next generation magnetic recording method that can operate beyond the trilemma limit1). We have already proposed a new HAMR model calculation2)~4). We have also shown in our improved model calculation that the signal-to-noise ratio derived by the conventionally used micromagnetic calculation can be explained using the temperature dependences of the grain magnetization reversal probability and the attempt period, whose inverse is the attempt frequency5). A feature of our model calculation is that it is easy to grasp the physical implication of the HAMR writing process and the calculation time is short. Since HAMR is a writing method in which the medium is heated to reduce coercivity at the time of writing, the coercivity of the medium can be reduced by any amount. However, micromagnetic simulation has shown that a relatively high writing field is necessary6). The actual HAMR system is very complicated, and various problems are intertwined. Therefore, we have separated problems in a simplified model using our model calculation. We have divided the topic of increasing writing field sensitivity into four problems using the bit error rate calculated with our model for HAMR, and we have discussed the calculation parameters related to the problems7). The four problems are write-error, erasure-after-write6), a statistical problem7), and the damping constant3). It has been reported that variation in the Curie temperature","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90903133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Iron Loss and Hysteresis Properties under High-Temperature Inverter Excitation 高温逆变器励磁下的铁损和磁滞特性

Journal of the Magnetics Society of Japan Pub Date : 2019-05-01 DOI: 10.3379/MSJMAG.1905R002

A. Yao, T. Hatakeyama

引用次数: 0