Pub Date : 1994-07-01DOI: 10.1109/TJMJ.1994.4565910
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{"title":"[Advertisement]","authors":"","doi":"10.1109/TJMJ.1994.4565910","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565910","url":null,"abstract":"Advertisement.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"nil2-nil2"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565910","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857899","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565901
Y. Satoh;S. Shikama;M. Kataoka;Y. Nakamura
The LIPS (longitudinally oriented inside layer, perpendicularly oriented surface layer) method of film orientation was improved in order to enable preparation of obliquely oriented tapes with a definite orientation angle. The permanent magnet pairs previously used in LIPS perpendicular orientation were replaced by an electromagnet with long iron plates for extension of the magnetic poles. Obliquely oriented tapes are easily prepared by appropriately choosing the coating speed and drying conditions. Coatings dried in a perpendicular magnetic field with an intensity gradient were found to be oriented not perpendicularly, but obliquely. It is thought that inner-layer particles are more easily displaced by the field gradient force than surface particles because of the effect of the viscosity gradient in the coating drying process.
{"title":"Perpendicular Magnetic Field Orientation of Acicular Particles: Oblique Orientation with Field Gradient and Viscosity Gradient in Coating","authors":"Y. Satoh;S. Shikama;M. Kataoka;Y. Nakamura","doi":"10.1109/TJMJ.1994.4565901","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565901","url":null,"abstract":"The LIPS (longitudinally oriented inside layer, perpendicularly oriented surface layer) method of film orientation was improved in order to enable preparation of obliquely oriented tapes with a definite orientation angle. The permanent magnet pairs previously used in LIPS perpendicular orientation were replaced by an electromagnet with long iron plates for extension of the magnetic poles. Obliquely oriented tapes are easily prepared by appropriately choosing the coating speed and drying conditions. Coatings dried in a perpendicular magnetic field with an intensity gradient were found to be oriented not perpendicularly, but obliquely. It is thought that inner-layer particles are more easily displaced by the field gradient force than surface particles because of the effect of the viscosity gradient in the coating drying process.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"114-119"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565901","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857901","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565897
J. Nakamura;H. Awano;H. Miyamoto;M. Takahashi;M. Ojima
The write/erase cyclability of Co-rich Pt/Co disks was studied, along with factors limiting the cyclability. Annealing experiments suggested that a decrease in CNR results from degradation of the perpendicular magnetic anisotropy in a Pt/Co film heated by an erasing laser beam. The main mechanism of degradation is atomic intermixing at the interface in Pt/Co multilayers. In the case of a Pt/Co film exposed to air, Co might be oxidized during erase cycles. The higher peak temperature of Pt/Co films accelerates the intermixing. Therefore, the number of cycles was increased by adding a heat-diffusive layer to the Pt/Co film in order to lower the peak temperature. For example, Au-coated Pt/Co disks were capable of 10 5 cycles as a result of a lower peak temperature (430°C), whereas SiN-coated Pt/Co disks, with a peak temperature of 770°C, were capable of only 10 2 cycles.
{"title":"Write/Erase Cyclability of Pt/Co Magneto-Optical Disks","authors":"J. Nakamura;H. Awano;H. Miyamoto;M. Takahashi;M. Ojima","doi":"10.1109/TJMJ.1994.4565897","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565897","url":null,"abstract":"The write/erase cyclability of Co-rich Pt/Co disks was studied, along with factors limiting the cyclability. Annealing experiments suggested that a decrease in CNR results from degradation of the perpendicular magnetic anisotropy in a Pt/Co film heated by an erasing laser beam. The main mechanism of degradation is atomic intermixing at the interface in Pt/Co multilayers. In the case of a Pt/Co film exposed to air, Co might be oxidized during erase cycles. The higher peak temperature of Pt/Co films accelerates the intermixing. Therefore, the number of cycles was increased by adding a heat-diffusive layer to the Pt/Co film in order to lower the peak temperature. For example, Au-coated Pt/Co disks were capable of 10\u0000<sup>5</sup>\u0000 cycles as a result of a lower peak temperature (430°C), whereas SiN-coated Pt/Co disks, with a peak temperature of 770°C, were capable of only 10\u0000<sup>2</sup>\u0000 cycles.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"85-91"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565897","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857913","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565899
F. Sato;N. Tezuka;T. Sakurai;T. Miyazaki
The relationship between coercivity and grain diameter was investigated for pure Fe, Ni and Co metals. The grain diameter of samples was varied between 200Å and 5 μm by preparing sputtered films and rapidly quenched ribbons. The coercivity in all cases was roughly proportional to the sixth power of the grain diameter below a certain diameter (200Å, 400Å and 300Å for Fe, Ni and Co respectively), and was proportional to the reciprocal of the grain diameter at larger values. This behavior can be satisfactorily explained in terms of the random anisotropy model proposed by Herzer and Alben et al.
{"title":"Grain Diameter and Coercivity of Fe, Ni, and Co Metals","authors":"F. Sato;N. Tezuka;T. Sakurai;T. Miyazaki","doi":"10.1109/TJMJ.1994.4565899","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565899","url":null,"abstract":"The relationship between coercivity and grain diameter was investigated for pure Fe, Ni and Co metals. The grain diameter of samples was varied between 200Å and 5 μm by preparing sputtered films and rapidly quenched ribbons. The coercivity in all cases was roughly proportional to the sixth power of the grain diameter below a certain diameter (200Å, 400Å and 300Å for Fe, Ni and Co respectively), and was proportional to the reciprocal of the grain diameter at larger values. This behavior can be satisfactorily explained in terms of the random anisotropy model proposed by Herzer and Alben et al.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"100-106"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565899","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68025569","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565909
H. Nasuno;A. Haga;T. Kanbayashi;K. Yamane
It is well known that in color CRTs, color changes occur as the result of magnetization of the shadow mask and frame by an ambient magnetic field. In order to clarify the influence of the mask and frame quantitatively, we used an integral equation method to analyze the magnetization resulting when a shadow mask and frame are subjected to an ambient field. The electron beam trajectories were calculated using the derived magnetic field distributions, and the mislanding was computed to obtain a quantitative evaluation of the color change. The results of the numerical analysis agree well with experiment, and help to clarify the relation of the shielding to the amount of mislanding.
{"title":"A Simulation of the Influence of the Magnetization of the Shadow Mask on the Electron Beam Trajectory","authors":"H. Nasuno;A. Haga;T. Kanbayashi;K. Yamane","doi":"10.1109/TJMJ.1994.4565909","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565909","url":null,"abstract":"It is well known that in color CRTs, color changes occur as the result of magnetization of the shadow mask and frame by an ambient magnetic field. In order to clarify the influence of the mask and frame quantitatively, we used an integral equation method to analyze the magnetization resulting when a shadow mask and frame are subjected to an ambient field. The electron beam trajectories were calculated using the derived magnetic field distributions, and the mislanding was computed to obtain a quantitative evaluation of the color change. The results of the numerical analysis agree well with experiment, and help to clarify the relation of the shielding to the amount of mislanding.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"171-176"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565909","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857898","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565902
K. Yamasawa
Studies of microtransformer-based switching converters are reviewed in this paper. A multilayered planar device consisting of zigzag-shape coils and Co-Zr amorphous magnetic films is used as the converter's main transformer. A resonant-type microconverter driven at high frequencies (6 MHz) shows excellent characteristics suited to practical applications, including high efficiency (49.5%), high output (0.35 W) and small size (10×10×0.23 mm).
{"title":"A DC-DC Converter Using a Microtransformer","authors":"K. Yamasawa","doi":"10.1109/TJMJ.1994.4565902","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565902","url":null,"abstract":"Studies of microtransformer-based switching converters are reviewed in this paper. A multilayered planar device consisting of zigzag-shape coils and Co-Zr amorphous magnetic films is used as the converter's main transformer. A resonant-type microconverter driven at high frequencies (6 MHz) shows excellent characteristics suited to practical applications, including high efficiency (49.5%), high output (0.35 W) and small size (10×10×0.23 mm).","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"120-126"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565902","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857903","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565881
Contains an entry for each author and co-author included in this issue of the publication.
包含本期出版物中每位作者和合著者的条目。
{"title":"List of contributors","authors":"","doi":"10.1109/TJMJ.1994.4565881","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565881","url":null,"abstract":"Contains an entry for each author and co-author included in this issue of the publication.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"nil1-nil1"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565881","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857905","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565888
K. Nago;A. Natsui;H. Yohda;H. Sakakima;Y. Nakatani;I. Aokura
Substrate bias-sputtered FeTaN/SiO 2 multilayer films with a doublelayer structure were prepared from electrically insulated thick FeTaN layers. These were built up of thin FeTaN layers with alternating anisotropy direction. Such films, hereafter referred to as "Double-Structured substrate Bias-sputtered Multilayer" (DSBM) films, were developed for potential application in magnetic heads. Double-Structured Laminated (DSL) heads composed of DSBM films sandwiched between ceramic substrates have been developed. These heads exhibit excellent recording characteristics equal to those of heads composed of Conventional Laminated (CL) FeTaN film heads used with high-coercivity tape. However, their reproduction characteristics are superior to those of CL heads at high frequencies.
{"title":"Double-Structured Laminated Heads with Substrate Bias-Sputtered FeTaN Films","authors":"K. Nago;A. Natsui;H. Yohda;H. Sakakima;Y. Nakatani;I. Aokura","doi":"10.1109/TJMJ.1994.4565888","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565888","url":null,"abstract":"Substrate bias-sputtered FeTaN/SiO\u0000<inf>2</inf>\u0000 multilayer films with a doublelayer structure were prepared from electrically insulated thick FeTaN layers. These were built up of thin FeTaN layers with alternating anisotropy direction. Such films, hereafter referred to as \"Double-Structured substrate Bias-sputtered Multilayer\" (DSBM) films, were developed for potential application in magnetic heads. Double-Structured Laminated (DSL) heads composed of DSBM films sandwiched between ceramic substrates have been developed. These heads exhibit excellent recording characteristics equal to those of heads composed of Conventional Laminated (CL) FeTaN film heads used with high-coercivity tape. However, their reproduction characteristics are superior to those of CL heads at high frequencies.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"28-33"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565888","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857916","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565906
M. Enokizono;T. Todaka;K. Yuki
In conventional magnetic measurements, magnetization characteristics are measured under excitation in a single direction, and consequently the results represent the magnetization characteristics in the measured direction. However, these characteristics cannot be applied to analyses which assume a rotating magnetic field. In order to analyze such fields, we measured the magnetization characteristics as vector values using a two-dimensional magnetic measurement apparatus. This paper presents a magnetic reluctivity tensor expression for the two-dimensional magnetization characteristics in finite element analysis. We show that the expression is an effective tool for the analysis of rotating magnetic fields.
{"title":"Two-Dimensional Magnetization Characteristics and Magnetic Field Analysis","authors":"M. Enokizono;T. Todaka;K. Yuki","doi":"10.1109/TJMJ.1994.4565906","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565906","url":null,"abstract":"In conventional magnetic measurements, magnetization characteristics are measured under excitation in a single direction, and consequently the results represent the magnetization characteristics in the measured direction. However, these characteristics cannot be applied to analyses which assume a rotating magnetic field. In order to analyze such fields, we measured the magnetization characteristics as vector values using a two-dimensional magnetic measurement apparatus. This paper presents a magnetic reluctivity tensor expression for the two-dimensional magnetization characteristics in finite element analysis. We show that the expression is an effective tool for the analysis of rotating magnetic fields.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"147-153"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565906","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68025566","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 : 1994-07-01DOI: 10.1109/TJMJ.1994.4565893
M. Otagiri;H. Muraoka;I. Watanabe;Y. Nakamura
In order to achieve high linear density recording, an SPT (single pole type) head must be used with a thin main pole film. We confirmed that high resolution in reproduction is obtained by using a head with a main pole 0.1 μm in thickness, but found that the reproduced properties become worse when the head is less than 0.1 μm thick. We also found that these properties are closely related to the cross-tie domain wall structure.
{"title":"Domain Configuration Effect of a Thin Main-Pole Film for SPT Heads","authors":"M. Otagiri;H. Muraoka;I. Watanabe;Y. Nakamura","doi":"10.1109/TJMJ.1994.4565893","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565893","url":null,"abstract":"In order to achieve high linear density recording, an SPT (single pole type) head must be used with a thin main pole film. We confirmed that high resolution in reproduction is obtained by using a head with a main pole 0.1 μm in thickness, but found that the reproduced properties become worse when the head is less than 0.1 μm thick. We also found that these properties are closely related to the cross-tie domain wall structure.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 4","pages":"58-62"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565893","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67857909","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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