Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837815
A. Uchida, M. Taguchi, M. Matsuura, A. Futamata, T. Uchiyama
{"title":"PRML read channel dealing with non-linearity for magnetically-induced super resolution media","authors":"A. Uchida, M. Taguchi, M. Matsuura, A. Futamata, T. Uchiyama","doi":"10.1109/INTMAG.1999.837815","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837815","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":"130226445","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.1999.837736
M. Birukawa, N. Miyatake, T. Suzuki
Recently, a magnetically-induced super resolution for read only memory disks (MSRROM), which utilizes the difference in coercivity between ‘’rough’’ and “smooth” areas in a disk has been proposed [l]. A double mask type MSR with high-resolulion for readout is realized. This method is advantageous for replication and for the compatibility with rewritable magnetooptical recording. This paper describes the recording performance in the MSR-ROM.
{"title":"Magnetically-induced super resolution for read only memory disks","authors":"M. Birukawa, N. Miyatake, T. Suzuki","doi":"10.1109/INTMAG.1999.837736","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837736","url":null,"abstract":"Recently, a magnetically-induced super resolution for read only memory disks (MSRROM), which utilizes the difference in coercivity between ‘’rough’’ and “smooth” areas in a disk has been proposed [l]. A double mask type MSR with high-resolulion for readout is realized. This method is advantageous for replication and for the compatibility with rewritable magnetooptical recording. This paper describes the recording performance in the MSR-ROM.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"61 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":"134196950","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.1999.837528
Bing Zhang, M. Song
{"title":"A systematic study of noise characteristics and overwrite in oriented and isotropic media","authors":"Bing Zhang, M. Song","doi":"10.1109/INTMAG.1999.837528","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837528","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"10 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":"130816791","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.1999.837497
O. Kitakami, N. Kikuchi, S. Okamoto, Y. Shimada, K. Oikawa, Y. Otani, K. Fukamichi
{"title":"Magnetocrystlline anisotropy of binary and ternary Co-Cr-X[X=Ta,Pt] alloys","authors":"O. Kitakami, N. Kikuchi, S. Okamoto, Y. Shimada, K. Oikawa, Y. Otani, K. Fukamichi","doi":"10.1109/INTMAG.1999.837497","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837497","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"27 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":"130951650","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.1999.837983
Yufeng Li
TA has bcen a critical issue for MR drives. From the point of view of user data integrity. TA can be generally classified into hvo categories: existing and new TA. In the first category, it is a result of a disk defect when the disk is manufactured. This defect can be caused by substrate noduleddents. organidinorganic contamination, texturelbumish sluny/scratches. or spuner splashlspits. Since this type of defect already exists on a disk before a drive is built, it can be mapped out during drive bum-in process. As a result, an exisling TA has a minimum effect on user data integrity although it may slightly affect the capacity of a drive. On the other hand, the consequence of having a new TA is very different. As its name implies, new TA occurs after a drive has passed all tests and has been shipped to customers. This type of TA is usually the result of loose particles from components, manufacturing process, or operation environment. The particle gets embedded into the head-media interface and induces a TA during normal operation. This can oecu in an area with existing data, and consequently causes user data loss. Obviously, the new TA is more catastrophic. This article addresses how to design an ABS to reduce this type of new TA.
{"title":"ABS design for new TA reduction","authors":"Yufeng Li","doi":"10.1109/INTMAG.1999.837983","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837983","url":null,"abstract":"TA has bcen a critical issue for MR drives. From the point of view of user data integrity. TA can be generally classified into hvo categories: existing and new TA. In the first category, it is a result of a disk defect when the disk is manufactured. This defect can be caused by substrate noduleddents. organidinorganic contamination, texturelbumish sluny/scratches. or spuner splashlspits. Since this type of defect already exists on a disk before a drive is built, it can be mapped out during drive bum-in process. As a result, an exisling TA has a minimum effect on user data integrity although it may slightly affect the capacity of a drive. On the other hand, the consequence of having a new TA is very different. As its name implies, new TA occurs after a drive has passed all tests and has been shipped to customers. This type of TA is usually the result of loose particles from components, manufacturing process, or operation environment. The particle gets embedded into the head-media interface and induces a TA during normal operation. This can oecu in an area with existing data, and consequently causes user data loss. Obviously, the new TA is more catastrophic. This article addresses how to design an ABS to reduce this type of new TA.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"27 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":"132884110","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.1999.837709
H. Yoda, H. Sakata, S. Hashimoto, K. Tateyama, M. Sahashi
{"title":"Narrow track self-aligned trench-pole writer having high writing efficiency","authors":"H. Yoda, H. Sakata, S. Hashimoto, K. Tateyama, M. Sahashi","doi":"10.1109/INTMAG.1999.837709","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837709","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"43 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":"133691781","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.1999.837817
T. Kato, H. Kimura, T. Nara, T. Nishiya
Introductipg PRbartial response) channels are widely used in high density magnetic recording. To w e PR channels. we need to boost the Nyquest frequency of the input signal. Consequently the SNR degrade. The MDFE(multileve1 dedBioo feedback equalizer) ia a simple detection scheme which dws not have this disadvantage[lI. An MDFE FFF(feed forward filter) c m mnrists of a continuous time filter which has low pass characteristics. There is no degradation caused by high frsquenq noise, end the power consumption of the MDFE FFF becomes lowar than that of the FFF Ior the PR channels. There arises a problem that it is diflieult to know output signs1 of the MDFE FFF. Thus it is not easy to train FFF paismetera adaptively. It in wecesaary to evaluate the performance degradation caused by the dispersion of the FFF. In this work, we describe the results of the performance evaluation for the MDFE by the dispersion of Qe and pole frequeneies af the FFF.
{"title":"Performance evaluation of MDFE with a simplified FFF","authors":"T. Kato, H. Kimura, T. Nara, T. Nishiya","doi":"10.1109/INTMAG.1999.837817","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837817","url":null,"abstract":"Introductipg PRbartial response) channels are widely used in high density magnetic recording. To w e PR channels. we need to boost the Nyquest frequency of the input signal. Consequently the SNR degrade. The MDFE(multileve1 dedBioo feedback equalizer) ia a simple detection scheme which dws not have this disadvantage[lI. An MDFE FFF(feed forward filter) c m mnrists of a continuous time filter which has low pass characteristics. There is no degradation caused by high frsquenq noise, end the power consumption of the MDFE FFF becomes lowar than that of the FFF Ior the PR channels. There arises a problem that it is diflieult to know output signs1 of the MDFE FFF. Thus it is not easy to train FFF paismetera adaptively. It in wecesaary to evaluate the performance degradation caused by the dispersion of the FFF. In this work, we describe the results of the performance evaluation for the MDFE by the dispersion of Qe and pole frequeneies af the FFF.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"203 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":"132151117","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.1999.837304
S. Harrison, R. Street, J. Budge, S. K. Jones
{"title":"A simple method of measuring magnetic rotational hysteresis losses in isotropic media","authors":"S. Harrison, R. Street, J. Budge, S. K. Jones","doi":"10.1109/INTMAG.1999.837304","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837304","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"16 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":"132386288","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.1999.837558
F. Profumo, A. Tenconi, G. Gianolio
Introduction Linear motor drive systems are becoming an alternative solution to standard rotational motor drives in several industrial applications. In practice. linear motors can be used to carry Out controlled l iear movements without using any mechanical interface. The principle of linear motors operation is the electromagnetic interaction between the stator and the cursor that origins the thrust jn the machine. On the other hand, the lateral force is the most important undesired effect generated by the same magnetic interaction To design a linear motor the traditional approach using design formula gives good results only in the preliminary design stage. the E M tools are required to compute the lateral force. In addition 2-D and 3-D finite element analyses can be performed to get the motor overall parameters and to verify the motor performance in any working conditions In industrial applications. synchronous linear motors seem to be the most attractive solution and this study is related to a contactless system based on a magnetic suspension Applications of these systems are in ultra clean and maintenance free rooms or where wear and maintenance would cause expensive plant out of Service In our study. because the motor has to work in an environment where the moving pan cannot be fed using a cable. this following innovative solution has been chosen the stator and not the cursor is supplied through a variable voltage, variable frequency supply As a consequence, a Double Side stator with and an internal IronLess cursor Motor @SUM) has been realised (Fig I): each stator side is composed by a three phase mil assembly encapsulated in the iron structure and the cursor is composed by an even number of permanent magnets (PM), mounted in alternated polarity and encapsulated in an amagnetic (ironless) structure [I] Peculiarity of this kind of structure is the reduced lateral force in comparison with other linear motor configurations [2].
{"title":"Novel PM linear motor for industrial applications: magnetic circuit design procedure","authors":"F. Profumo, A. Tenconi, G. Gianolio","doi":"10.1109/INTMAG.1999.837558","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837558","url":null,"abstract":"Introduction Linear motor drive systems are becoming an alternative solution to standard rotational motor drives in several industrial applications. In practice. linear motors can be used to carry Out controlled l iear movements without using any mechanical interface. The principle of linear motors operation is the electromagnetic interaction between the stator and the cursor that origins the thrust jn the machine. On the other hand, the lateral force is the most important undesired effect generated by the same magnetic interaction To design a linear motor the traditional approach using design formula gives good results only in the preliminary design stage. the E M tools are required to compute the lateral force. In addition 2-D and 3-D finite element analyses can be performed to get the motor overall parameters and to verify the motor performance in any working conditions In industrial applications. synchronous linear motors seem to be the most attractive solution and this study is related to a contactless system based on a magnetic suspension Applications of these systems are in ultra clean and maintenance free rooms or where wear and maintenance would cause expensive plant out of Service In our study. because the motor has to work in an environment where the moving pan cannot be fed using a cable. this following innovative solution has been chosen the stator and not the cursor is supplied through a variable voltage, variable frequency supply As a consequence, a Double Side stator with and an internal IronLess cursor Motor @SUM) has been realised (Fig I): each stator side is composed by a three phase mil assembly encapsulated in the iron structure and the cursor is composed by an even number of permanent magnets (PM), mounted in alternated polarity and encapsulated in an amagnetic (ironless) structure [I] Peculiarity of this kind of structure is the reduced lateral force in comparison with other linear motor configurations [2].","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"179 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":"132708276","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.1999.837287
B. Huang, K. Yamamoto, C. Kaido, Y. Yamashiro
{"title":"Effect of cold-rolling on magnetic properties of non-oriented silicon steel sheets","authors":"B. Huang, K. Yamamoto, C. Kaido, Y. Yamashiro","doi":"10.1109/INTMAG.1999.837287","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837287","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"106 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":"133127739","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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