International Conference on Magnetics最新文献

{"title":"Frequency response of thin film heads with longitudinal and transverse anistropy","authors":"M. Mallary, A. Torabi, S. Batra, A. Smith, L. Cappabianca, W. Goller","doi":"10.1109/20.104366","DOIUrl":"https://doi.org/10.1109/20.104366","url":null,"abstract":"A transmission surface model (TSM) that analyzes the conduction of flux by rotation and wall motion is reported. It has been used to quantitatively compare the predicted performance of thin-film heads with longitudinal and transverse magnetic anisotropy. The TSM analysis predicts that a transversely oriented type of thin-film head can be operated at much higher frequencies than a longitudinally oriented head. In addition, its group delay dispersion is much less. Finally, its susceptibility to wall pinning is an order of magnitude less. Therefore, it is concluded that the traditional aversion of head designers to the longitudinal orientation is justified for frequencies above several megahertz. >","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125212307","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}

{"title":"Sputtered Tb/FeCoTi Multilayered Films for magneto-optical recording","authors":"K. Toki, E. Kariyada, M. Shimada, S. Yumoto, O. Okada","doi":"10.1109/20.104500","DOIUrl":"https://doi.org/10.1109/20.104500","url":null,"abstract":"The magnetic properties of Tb/FeCoTi multilayered films, prepared by two-source DC magnetron sputtering, have been investigated as a function of the layer thickness to improve the recording sensitivity of magnetooptical disks. For a fixed bilayer thickness ratio, the Curie temperature, T/sub c/, was strongly dependent on the Tb layer thickness and reached a maximum near 4 AA. The Kerr rotation theta /sub k/ is almost constant, independent of the Tb layer thickness. The effective composition shifts to the transition-metal-rich side with increase in Tb layer thickness, greater than 4 AA, made possible a pronounced reduction in T/sub c/ and effective composition adjustment, without decreasing theta /sub k/. Studies on recording characteristics revealed that recording sensitivity and bias magnetic fields are controlled by the Tb layer thickness, without sacrificing carrier-to-noise ratio. >","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121201286","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}

{"title":"Comparison between various hysteresis models and experimetnal data","authors":"F. Ossart, G. Meunier","doi":"10.1063/1.344585","DOIUrl":"https://doi.org/10.1063/1.344585","url":null,"abstract":"We propose a comparison between results predicted by two mathematical models of magnetic hysteresis and experimental data. The first model is based on the Preisach model, the second consists in solving a differential equation between B and H. Those models are very different in their principles and the properties they exhibit. In particular, the second one models the accommodation of minor loops and the anhysteresis curve when the first does not. The magnetic material we study is a CoNiCr alloy for longitudinal digital recording. We give some results showing that, for this material, the Mayergoyz model fits better the experimental behavior.","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129458325","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}

{"title":"Calculation of forces and torques in permanent magnet machines with small air gaps","authors":"E. S. Hamdi, A.F. Licario-Nogueira, S. Hopkins","doi":"10.1109/INTMAG.1990.734924","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734924","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"6 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":"115004903","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}

{"title":"Anisotropic Pr-Fe-B Melt-Spun Ribbons","authors":"C. Paik, M. Okada, M. Homma","doi":"10.1109/20.104507","DOIUrl":"https://doi.org/10.1109/20.104507","url":null,"abstract":"Magnetic properties and microstructures of Pr-Fe-B-(Ga) melt-spun ribbons prepared by single or twin rollers have been studied. Strong intensities of","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":"115427298","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}

{"title":"Study of corrosion stability in metal particulate media","authors":"Y. Yamamoto, K. Sumiya, A. Miyake, M. Kishimoto, T. Taniguchi","doi":"10.1109/20.104631","DOIUrl":"https://doi.org/10.1109/20.104631","url":null,"abstract":"Metal particulate tape was prepared using stabilized metal particles, and the corrosion stability of the tape was examined under various environmental atmospheres. The decrease of magnetization after exposure to 60 degrees C/90% RH (relative humidity) for four weeks was bout 7%. When the tape was stored in a low concentration of pollutants of Cl/sub 2/, H/sub 2/S, and NO/sub 2/ gases, the change of magnetic properties was within about 0.6%. These stable characteristics show that the stabilized metal particulate tape is suitable for data-storage media. >","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":"123082095","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}

{"title":"Magnetic and magneto-optical properties and crystallization kinetics of rapid-thermally crystallized Bi-substituted garnet films","authors":"T. Suzuki, G. Zaharchuk, G. Gorman, F. Sequeda, P. Labun","doi":"10.1109/20.104572","DOIUrl":"https://doi.org/10.1109/20.104572","url":null,"abstract":"A rapid thermal anneal for forming films of garnet phase deposited by sputtering is discussed, and the magnetic, magnetooptical, and optical properties of the annealed materials are examined. It was found that the rapid thermal anneal kinetics in the temperature range from 620 to 680 degrees C involves a high activation energy for crystallization which is diffusion-controlled growth, whereas in a higher temperature range it has a relatively low activation energy. It is concluded that the controllability of magnetic properties can be achieved through the rapid thermal annealing method. >","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"12 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":"127189312","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}

{"title":"Time-periodic non-linear analysis using equivalent sine wave method","authors":"T. Ueyama, K. Umetsu, R. Ueda","doi":"10.1109/INTMAG.1990.734352","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.734352","url":null,"abstract":"For the numerical analysis of time-periodic non-linear magnetic field, the well-known complex function analysis, which replaces time deri vati ve operator by jw, cannot be used. Therefore in general, the so-called step-by­ step methods have been used!. Although the ingenious means is adopted, the method is never practical because it requires much computing time. This paper presents an equivalent sine wave method. The method is composed of the follow­ ing three procedures: (1) Replace the magnetic flux or magnetic field distorted by the non-linearity of B-H curve by the corresponding sine wave of which ef­ fective value is equal to that of'the original distorted wave; (Z) Analyze the equivalently replaced wave with jw method; (3) Transform the analyzed results into time domain by taking into account the B-H curve. The proposed method can make the analysis of the distorted wave caused by the non-linearity implemented through the convergence calculation of one time. 1. Analysis Procedure Let us assume that the non-linear B-H characteristics of magnetic material is given by Curve 1 in Fig.l. When this material is magnetized by current source and mmf is sine wave, the magnetic flux is distorted (Curve Z in Fig.Z). On the contrary, if the material is magnetized by voltage source and the flux is sine wave, mmf is distorted (Curve 2 in Fig.3). Curve 2 in Fig.2 obtained from Curve 1 in Fig.1 shows the magnetic flux density wave when the peak value of mmf shown as Curve 1 in Fig.2 has an arbitrary value H.. This flux density contains higher harmonics and its effective value Br�. can be calculated from B.,·\" ,B., \" ',B, and H.,\" ',H.,'·',H,. The sine wave whose effective value is equal to that of Br •• has the peak value /2Br •• (Curve 3 in Fig. 2). Now, similar to the calculation of \",'2Brras corresponding to Ha, the peak values of equivalent sine wave flux corresponding to 0H .. are calculated. They produce Curve 2 in Fig. 1 . While Curve 1 in Fig. 1 shows the B-H curve caused by OC current, Curve 2 is regarded as tl at caused by AC current. Non-linear analysis is then implemented with jw methcxl using the time periodic B-H curve. The resultant magnetic flux density is represented by the equivalent sine wave, and the distorted wave can be obtained by using B-H curve in Fig.1. 2. Analyzed Example Fig.4 shows an example of tiJne-periodic f i,��sitY non-linear analysis with the above procedure. B. Fig.4(d) illustrates each magnetic flux denB.-. �_-_-��=, -­ sity wave at three points A, B and C in Bk ----C�;;.-2--, : Fig.4(c). The proposed method reduces the Bk-< --------Cur,vo 1 ! computing time at least one by tenth of the B'r---. -: : I step-by-step methods without l()sing the : I i : required accuracy. It can be am.lyzed with B. : : : I the salDe procedure for magnetizati()n by vol t: : : : : . I ! I age source. Reference-l T.Nakata,et.al, IEEE Trans. on Mag. ,vol 25, No.5, pp.4150-4152, Sept., 1989. ,, ' ' I\" H2'( Hk-t Hk 'Hm-t H.MMF Flg.t. 8-H Curve 80-","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"51 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":"125073107","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}

{"title":"Theoretical and numerical difficulties in 3D-Vector potential methods in finite element magnetostatic computations","authors":"N. Demerdash, R. Wang","doi":"10.1109/20.104481","DOIUrl":"https://doi.org/10.1109/20.104481","url":null,"abstract":"The results of the application of three well-known 3-D magnetic vector potential (MVP)-based finite-element formulations for computation of magnetostatic fields in electrical devices are discussed. The three methods were identically applied to three practical examples, the first of which contained only one medium (free space), while the second and third examples contained a mix of free space and iron. The first of these methods is based on the unconstrained curl-curl of the MVP, while the second and third methods are predicated upon constraining the divergence of the MVP to zero (Coulomb's gauge). It was found that the two latter methods cease to give useful and meaningful results when the global solution region contains a mix of media of high and low permeabilities. Furthermore, it was found that their results do not achieve the intended zero constraint on the divergence of the MVP. >","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"12 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":"123551462","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}

{"title":"Review of the Kerr Magneto-Optic Effect of Thin Magnetic Films","authors":"M. Parker","doi":"10.1109/INTMAG.1990.733859","DOIUrl":"https://doi.org/10.1109/INTMAG.1990.733859","url":null,"abstract":"","PeriodicalId":289239,"journal":{"name":"International Conference on Magnetics","volume":"43 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":"123597272","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}