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Elimination of finite element spurious modes using a modal transformation technique 利用模态变换技术消除有限元杂散模态
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/20.104517
B. MacNeal, L. A. Larkin, J. Brauer, A. Cifuentes
{"title":"Elimination of finite element spurious modes using a modal transformation technique","authors":"B. MacNeal, L. A. Larkin, J. Brauer, A. Cifuentes","doi":"10.1109/20.104517","DOIUrl":"https://doi.org/10.1109/20.104517","url":null,"abstract":"Spurious modes are eliminated from finite-element vector potential electromagnetic field calculations by transforming the basic dynamic equation into modal coordinates. First, model basis functions are obtained by solving the dynamic equation for its characteristic eigenvectors. The direct solution is then expressed as a sum of these basis vectors multiplied by unknown modal amplitudes. Matrices and loads are also transformed into modal coordinates. The resulting modal dynamic equation may then be solved using a variety of analysis techniques. If the basis is chosen to be divergence-free, then solutions are free of spurious modes. The standard penalty function method is shown to be an efficient means of constructing a divergence-free basis. Examples of modal eigenvalue analysis are discussed. Results are independent of the penalty parameter used. >","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126758080","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: 2
Viscosity effects in multi-wire HGMS 多线HGMS中的粘度效应
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734449
P. Lawson, R. Gerber
{"title":"Viscosity effects in multi-wire HGMS","authors":"P. Lawson, R. Gerber","doi":"10.1109/INTMAG.1990.734449","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734449","url":null,"abstract":"The effects of viscosity and velocity of flow upon the performance of multi-wire HGMS filters are experimentally investigated. The results of mequrements are analysed and found in agreement with the theoretical model based upon the HGMS filter performance exponental law. The differences in detail are probably due to the approximation of flow conditions.","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115198371","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
High correctivity and circumferencial magnetic anistrophy hard disk with glass substrate 采用玻璃基板的高正确率、周向磁非均匀硬盘
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734305
M. Ishikawa, K. Terao, M. Hashimoto, N. Tani, Y. Ota, K. Nakamura
{"title":"High correctivity and circumferencial magnetic anistrophy hard disk with glass substrate","authors":"M. Ishikawa, K. Terao, M. Hashimoto, N. Tani, Y. Ota, K. Nakamura","doi":"10.1109/INTMAG.1990.734305","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734305","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122944699","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
Correlations between magnetic microstructure and noise spectra for CoNi and CoCrTa thin film media CoNi和CoCrTa薄膜介质的磁微结构与噪声谱的相关性
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734901
M.R. Khan, S.Y. Lee, J. Pressesky, D. Williams, R. Fisher, N. Heiman
{"title":"Correlations between magnetic microstructure and noise spectra for CoNi and CoCrTa thin film media","authors":"M.R. Khan, S.Y. Lee, J. Pressesky, D. Williams, R. Fisher, N. Heiman","doi":"10.1109/INTMAG.1990.734901","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734901","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122996939","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
Flexible transactaneous trnaformer forartificial heart system 人工心脏系统用柔性经皮变压器
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734283
H. Matsuki, M. Shiki, K. Murakami, K. Nadehara, T. Yamamoto
{"title":"Flexible transactaneous trnaformer forartificial heart system","authors":"H. Matsuki, M. Shiki, K. Murakami, K. Nadehara, T. Yamamoto","doi":"10.1109/INTMAG.1990.734283","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734283","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114150148","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
The nonlinear optical susceptibility of a magnetic layer 磁性层的非线性光学磁化率
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734932
J. Kociński
{"title":"The nonlinear optical susceptibility of a magnetic layer","authors":"J. Kociński","doi":"10.1109/INTMAG.1990.734932","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734932","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122040963","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
Unwinding Bloch line pair writing 开卷布洛赫行对写入
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734813
L. Zimmerman, J. Miltat, L. Arnaud, F. Boileau, M. Vaudaine
{"title":"Unwinding Bloch line pair writing","authors":"L. Zimmerman, J. Miltat, L. Arnaud, F. Boileau, M. Vaudaine","doi":"10.1109/INTMAG.1990.734813","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734813","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122120883","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
On the magnetic analysis of As-Cast rare earth-rich binary alloys: RE/sub 100-x/-Fe/sub x/ (RE=Pr, Nd:2.5 铸态富稀土二元合金RE/sub - 100-x/-Fe/sub -x/ (RE=Pr, Nd:2.5)的磁性分析
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.734860
J. Sánchez, F. Calderón, F. Leccabue, F. Bolzoni, J. Nozieres
{"title":"On the magnetic analysis of As-Cast rare earth-rich binary alloys: RE/sub 100-x/-Fe/sub x/ (RE=Pr, Nd:2.5","authors":"J. Sánchez, F. Calderón, F. Leccabue, F. Bolzoni, J. Nozieres","doi":"10.1109/INTMAG.1990.734860","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734860","url":null,"abstract":"Recently, several reports have appeared dealing with the formation of a new highly anisotropic ternary phase in the Nd-Fe binary system 1-3 . The aim of this work is both to provide a systematic magnetic analysis of as-cast RE100-xFex polycrystalline alloys (with RE= Pr, Nd; 2.5 :>; x :>; 40) and to report the magnetic properties of the hard ferromagnetic phases present. The samples were prepared in an arc melting furnace. The magnetic characterization was made by means of thermomagnetic analysis (TMA), extraction and vibrating sample magnetometry (from 2 K to the ordering temperature), and the singular point detection technique (SPD). The dependence of the saturation magnetization (as), intrinsic coercivity (iHc) and Curie temperature (Tcl on iron content for RE100xFe x alloys are given in Figs. 1a,b. Thermomagnetic data of as-cast R E 1 OO-xFex alloys revealed the existence, in the composition range 2.5 :>; x :>; 20, of a hard magnetic phase called A1. In the Pr-based system, in the composition range 25 :>; x :>; 27.5, a soft paramagnetic phase is present, while the RE2Fe17 compound is present when the iron content is x � 30. In alloys in which the new hard anisotropic phase is the only magnetic phase detected, the iHc is strongly increased at low temperatures and go down to zero near Tc. Despite the fact that these new hard magnetic phases have not been yet isolated, we have used the SPD technique to determine the anisotropy field on magnetic particles randomly distributed in a non-magnetic matrix; the temperature dependence of the anisotropy field for RE100-xFsx from 128 to 300 K is shown in Fig. 2. A highly anisotropic material, with a RT anisotropy field value of 19.5 and 18.3 kOe for Ndand Pr-systems, respectively, exists as the only ferromagnetic phase in the composition range of 2.5 :>; x :>; 20. The origin of the high coercivities, observed in as-cast alloys, can be hence explained as due to the formation of a fine particle assembly of the new","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122183048","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
Structural and magnetic amisotropy in amorphous rare earth transition metal alloys 非晶稀土过渡金属合金的结构和磁性各向异性
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/INTMAG.1990.733856
E. Marinero, M. Hirscher, T. Egami
{"title":"Structural and magnetic amisotropy in amorphous rare earth transition metal alloys","authors":"E. Marinero, M. Hirscher, T. Egami","doi":"10.1109/INTMAG.1990.733856","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.733856","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129707016","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
Line element for efficient computation of the magnetic field created by thin iron plates 有效计算由薄铁板产生的磁场的线元
International Conference on Magnetics Pub Date : 1990-04-17 DOI: 10.1109/20.104667
X. Brunotte, Gérard Meunier
{"title":"Line element for efficient computation of the magnetic field created by thin iron plates","authors":"X. Brunotte, Gérard Meunier","doi":"10.1109/20.104667","DOIUrl":"https://doi.org/10.1109/20.104667","url":null,"abstract":"The problem of computing the magnetic anomaly created by iron ships in the Earth's field is considered. From a modeling point of view, one of the major characteristics of this problem is the external and uniform magnetic source (the Earth's field). A good way of taking this into account is to simulate infinity and to use the reduced scalar potential as the state function. The major difficulty in modeling ships is the presence of sophisticated 3-D geometries due to the disproportion between the global size of a ship and the thickness of the iron plates. The modeling of the thin iron plates is examined, and it is shown that an efficient method is to use line elements in 2-D and surface elements in 3-D. The authors present the finite-element formulations used, applied to scalar potentials (reduced or total). The formulations using line elements have been successfully applied, even to a magnetic region with small permeability values. Results in 2-D and comparisons with analytical solutions and actual measurements are presented. >","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129731067","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: 47
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