Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837856
Jun-Xian Zhang, Zhaohua Cheng, D. Goll, H. Kronmuller
The Srn2FelsGa2C2 compound can be used as raw material for high performance permanent magnets due to its high Curie temperature. strong uniaxial anisotropy, and high thermal stability [I]. High coercivity magnets have k e n obtained for Smz(Fe.Ga)& by meltspinning [Z]. In this work the hard magnetic properties and coercivity mechanism of melt-spun nanocrystalline Sm2Fe,5Ga2Zr.Cz 2 alloys are investigated. As-quenched ribbons with composition of Sm8elsGa2Zr.Czz (I = 0, 0.1, 0.3) were prepared by melt-spinning. The as-quenched ribbons show very low coercivities due to the amorphous state of the magnetic phase. In order to obtain good hard magnetic properties, the asquenched samples were annealed at temperatures between 760-850T for 15 min. The optimum annealing temperature for the samples x = 0. 0.1 and 0.3 are 775°C. 775T and 850"C, respectively. XRD patterns show that the crystallized alloys consist nearly of single Th2Znl,-type structure phase. From XRD patterns and thermomagnetic cnrves it can be Seen that the lattice constants a, c and the Curie temperature T, of the 217-phase keep constant with increasing Zrconcentration implying that the Zr atoms do not enter the ThzZnl,-type structure. The maenetization measurements ware carried out with a vibrating samole maenetometer in an . I a p & d field up to 7 T in the temperature range of 50-550 K.
{"title":"Magnetic hardening of nanocrystalline Sm/sub 2/Fe/sub 15/Ga/sub 2/Zr/sub x/C/sub 2.2/ permanent magnets","authors":"Jun-Xian Zhang, Zhaohua Cheng, D. Goll, H. Kronmuller","doi":"10.1109/INTMAG.1999.837856","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837856","url":null,"abstract":"The Srn2FelsGa2C2 compound can be used as raw material for high performance permanent magnets due to its high Curie temperature. strong uniaxial anisotropy, and high thermal stability [I]. High coercivity magnets have k e n obtained for Smz(Fe.Ga)& by meltspinning [Z]. In this work the hard magnetic properties and coercivity mechanism of melt-spun nanocrystalline Sm2Fe,5Ga2Zr.Cz 2 alloys are investigated. As-quenched ribbons with composition of Sm8elsGa2Zr.Czz (I = 0, 0.1, 0.3) were prepared by melt-spinning. The as-quenched ribbons show very low coercivities due to the amorphous state of the magnetic phase. In order to obtain good hard magnetic properties, the asquenched samples were annealed at temperatures between 760-850T for 15 min. The optimum annealing temperature for the samples x = 0. 0.1 and 0.3 are 775°C. 775T and 850\"C, respectively. XRD patterns show that the crystallized alloys consist nearly of single Th2Znl,-type structure phase. From XRD patterns and thermomagnetic cnrves it can be Seen that the lattice constants a, c and the Curie temperature T, of the 217-phase keep constant with increasing Zrconcentration implying that the Zr atoms do not enter the ThzZnl,-type structure. The maenetization measurements ware carried out with a vibrating samole maenetometer in an . I a p & d field up to 7 T in the temperature range of 50-550 K.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131965697","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837111
P. Bonyhard, R. Holmes, D. Lewis
One important requirement of any MR head off-track capability (OTC) model [1,2] is to predict OTC as a funclion of mite width (W) and read width (R). For practical purposes it is of more interest to predict the minimum of OTC and OTC, (where OTC, is OTC measured with the adjacent hscks at infinity), as OTOOTC, implies a value of OTC that is higher when adjacent tracks ate prfsent, which is not always the case in a drive. Thus, we detine X=min(OTC,OTC,) and we examine., by comparison with experimental data, how well the optimum values of nominal Wand R for maximum X are being predicted by modeling results
{"title":"Write and read track width optimization - data vs. model","authors":"P. Bonyhard, R. Holmes, D. Lewis","doi":"10.1109/INTMAG.1999.837111","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837111","url":null,"abstract":"One important requirement of any MR head off-track capability (OTC) model [1,2] is to predict OTC as a funclion of mite width (W) and read width (R). For practical purposes it is of more interest to predict the minimum of OTC and OTC, (where OTC, is OTC measured with the adjacent hscks at infinity), as OTOOTC, implies a value of OTC that is higher when adjacent tracks ate prfsent, which is not always the case in a drive. Thus, we detine X=min(OTC,OTC,) and we examine., by comparison with experimental data, how well the optimum values of nominal Wand R for maximum X are being predicted by modeling results","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131297055","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837103
H. Kanai, M. Kanamine, A. Hashimoto, K. Aoshima, K. Noma
Reducing the free layer thickness is needed to maintain high field sensitivity in spin-valve heads 1 recording densities over 10 GbiWin2. However, this increaser the readback amplitude asymmeq due to the demagnetizing field Gom the pinned layer and causes the readback instability due to the high field sensitivity of the h e layer. In this paper, ye describe the fabrication and the excellent readhnite performance of narmw mck-width spin-valve heads with thin free laym. CaFeB/RdCoFeB synthetic fenimagnet pinned layers were used to improve the as-cuy. Domain control was d i d by Copt magneb with exchange bias Fe underlayers.
{"title":"PdPtMn/CoFeB synthetic ferrimagnet spin-valve heads with exchange bias domain stabilization","authors":"H. Kanai, M. Kanamine, A. Hashimoto, K. Aoshima, K. Noma","doi":"10.1109/INTMAG.1999.837103","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837103","url":null,"abstract":"Reducing the free layer thickness is needed to maintain high field sensitivity in spin-valve heads 1 recording densities over 10 GbiWin2. However, this increaser the readback amplitude asymmeq due to the demagnetizing field Gom the pinned layer and causes the readback instability due to the high field sensitivity of the h e layer. In this paper, ye describe the fabrication and the excellent readhnite performance of narmw mck-width spin-valve heads with thin free laym. CaFeB/RdCoFeB synthetic fenimagnet pinned layers were used to improve the as-cuy. Domain control was d i d by Copt magneb with exchange bias Fe underlayers.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131755686","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837377
S.G. Kim, Y. Otani, K. Fukamichi, S. Yuasa, M. Nývlt, T. Katayama
Magnetoresistivity effects in association with the magnetic domain structure were studied by using 1 pm wide epitaxial (10.0) CO wires oriented parallel and perpendicular to the magnetic easy (Ol) axis. The parallel wire exhibited a large anisotropy magnetoresistivity ratio of -11 % at 5 K, which turned to be negative above 214 K due to the temperature variable anisotropic magneto- resistivity effect. A negative domain wall contribution to the resistivity was observed only in the temperature range from 200 K to 220 K. On the contrary, the perpendicular wire exhibited a small positive wall contribution ranging from 3 x mcm at 5 K to 6.9 x 10" pQcm at 300 K.
{"title":"Magnetoresistivity of micron size (10-0) epitaxial Co wire","authors":"S.G. Kim, Y. Otani, K. Fukamichi, S. Yuasa, M. Nývlt, T. Katayama","doi":"10.1109/INTMAG.1999.837377","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837377","url":null,"abstract":"Magnetoresistivity effects in association with the magnetic domain structure were studied by using 1 pm wide epitaxial (10.0) CO wires oriented parallel and perpendicular to the magnetic easy (Ol) axis. The parallel wire exhibited a large anisotropy magnetoresistivity ratio of -11 % at 5 K, which turned to be negative above 214 K due to the temperature variable anisotropic magneto- resistivity effect. A negative domain wall contribution to the resistivity was observed only in the temperature range from 200 K to 220 K. On the contrary, the perpendicular wire exhibited a small positive wall contribution ranging from 3 x mcm at 5 K to 6.9 x 10\" pQcm at 300 K.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129274743","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837963
H.W. Zhang, Z. Zhong, Y.L. Liu, H. Wang
{"title":"Structure and magneto-optical properties of fine -grain garnet thin film prepared by pyrolysis method","authors":"H.W. Zhang, Z. Zhong, Y.L. Liu, H. Wang","doi":"10.1109/INTMAG.1999.837963","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837963","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126294682","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837422
D. Ping, K. Hono, H. Kanekiyo, S. Hirosawa
{"title":"Effect of Cu andNb on the microstructure and magnetic properties of Fe/sub 2/B/Nd/sub 2/Fe/sub 14/B nanocomposite permanent magnets","authors":"D. Ping, K. Hono, H. Kanekiyo, S. Hirosawa","doi":"10.1109/INTMAG.1999.837422","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837422","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126052750","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837442
K. Han, H. Kim, J. Chun, Hyun-Kyo Jung
For the three-dimensional analysis of magnetic systems, Reluctance Network Method(RNM) can he used efficiently. RNM, a kind of modification of magnetic equivalent circuit method(MECM), ensures high accuracy similar to FEM and short computation time. Because of this feature, for the analysis that requires the consideration of some nonlinearity such as magnetic saturation of iron material and the magnetizing processes in permanent magnet, RNM can be used reasonably. In this paper, a permanent magnet lifter (PML) model i s analyzed with RNM,
{"title":"Analysis of the three dimensional magnetic system with nonlinearity using reluctance network method","authors":"K. Han, H. Kim, J. Chun, Hyun-Kyo Jung","doi":"10.1109/INTMAG.1999.837442","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837442","url":null,"abstract":"For the three-dimensional analysis of magnetic systems, Reluctance Network Method(RNM) can he used efficiently. RNM, a kind of modification of magnetic equivalent circuit method(MECM), ensures high accuracy similar to FEM and short computation time. Because of this feature, for the analysis that requires the consideration of some nonlinearity such as magnetic saturation of iron material and the magnetizing processes in permanent magnet, RNM can be used reasonably. In this paper, a permanent magnet lifter (PML) model i s analyzed with RNM,","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126780590","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837612
Y. Mori, S. Torii, D. Ebihara
On the other hand, the Wavelet transform technique allows transforming the wave to This feature enables high-accuracy analyzing So the purpose of this study is establish the method of analyzing being developed for the urban transportation systems. suspension and short-stator linear induction motor (LIM). increased, the performance of LIM is degraded in such system. end effect. problem [I]. high-accuracy in this technique, the number of calculates times increases.
{"title":"Development of analysis of linear induction motor based on the wavelet transform technique","authors":"Y. Mori, S. Torii, D. Ebihara","doi":"10.1109/INTMAG.1999.837612","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837612","url":null,"abstract":"On the other hand, the Wavelet transform technique allows transforming the wave to This feature enables high-accuracy analyzing So the purpose of this study is establish the method of analyzing being developed for the urban transportation systems. suspension and short-stator linear induction motor (LIM). increased, the performance of LIM is degraded in such system. end effect. problem [I]. high-accuracy in this technique, the number of calculates times increases.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114167343","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837122
M. Mochida, T. Yamauchi, Y. Arita
A laser diode(LD) is used for a laser texture ap- paratus to form bumps on the Ni-P plated aluminum substrate for hard disks. The laser diode module of the apparatus com- prises a LD, a collimator lens, a polarization beam splitter, a quarter wave plate and an,objective lens for irradiating a pulsed laser beam on a surface on the substrate. The power of the LD is 3OOmW and the numerical aperture of the objective lens is 0.8 for applying high power density. The shape of the bumps made by the apparatus is similar to that of the bumps which made by laser texture apparatus comprising a high power continuous wave laser and an electro-optic modulator. The bump height is adjustable from lOnm to 35nm by changing the scanning length and the spindle speed. Index Term-Diode, Hard disk, Laser, Texture.
{"title":"Laser texture apparatus using laser diode","authors":"M. Mochida, T. Yamauchi, Y. Arita","doi":"10.1109/INTMAG.1999.837122","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837122","url":null,"abstract":"A laser diode(LD) is used for a laser texture ap- paratus to form bumps on the Ni-P plated aluminum substrate for hard disks. The laser diode module of the apparatus com- prises a LD, a collimator lens, a polarization beam splitter, a quarter wave plate and an,objective lens for irradiating a pulsed laser beam on a surface on the substrate. The power of the LD is 3OOmW and the numerical aperture of the objective lens is 0.8 for applying high power density. The shape of the bumps made by the apparatus is similar to that of the bumps which made by laser texture apparatus comprising a high power continuous wave laser and an electro-optic modulator. The bump height is adjustable from lOnm to 35nm by changing the scanning length and the spindle speed. Index Term-Diode, Hard disk, Laser, Texture.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115960884","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}
Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837559
F. Profumo, A. Tencord, G. Gianolio, G. Falcitelli, N. Vasen
Introduction A new method to evaluate the parameters of the classical equivalent circuit for three-phase induction machines is presented. The method is based on a 2D transient simulation, performed by a Finite Element Method (FEM) software. The basic idea is to substitute the two classical laboratory tests (the short circuit and the no load tests) with a simulation test (not realisable in laboratory) to get the circuit parameters. It is nexssary to underline that it would be very difficult to simulate classical labratory test involving some motor parts in movement
{"title":"Induction motor model parameters evaluation using a new approach based on the finite element method","authors":"F. Profumo, A. Tencord, G. Gianolio, G. Falcitelli, N. Vasen","doi":"10.1109/INTMAG.1999.837559","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837559","url":null,"abstract":"Introduction A new method to evaluate the parameters of the classical equivalent circuit for three-phase induction machines is presented. The method is based on a 2D transient simulation, performed by a Finite Element Method (FEM) software. The basic idea is to substitute the two classical laboratory tests (the short circuit and the no load tests) with a simulation test (not realisable in laboratory) to get the circuit parameters. It is nexssary to underline that it would be very difficult to simulate classical labratory test involving some motor parts in movement","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"4 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113932560","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}
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