Pub Date : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177044
V. Minuhin
This paper gives a theoretical discussion on the subject of correlation versus convolution in magnetic recording, and outlines various misconceptions which have arisen in the signal processing field. It details errors in the usage of convolution and how this technique does not apply to perpendicular magnetic recording.
{"title":"Superposition in magnetic readback","authors":"V. Minuhin","doi":"10.1109/NAPMRC.2003.1177044","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177044","url":null,"abstract":"This paper gives a theoretical discussion on the subject of correlation versus convolution in magnetic recording, and outlines various misconceptions which have arisen in the signal processing field. It details errors in the usage of convolution and how this technique does not apply to perpendicular magnetic recording.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121430587","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177037
M. Xiao, K. Takano, H. Rosen, S. Faruque
With decreasing trackwidth, track density increases while jitter goes up, limiting the linear density. Overall, we expect a gain in areal density with reducing bit aspect ratio (BAR). In order to create narrow trackwidths thereby achieve small BAR, we utilized the microtrack technique. This novel approach enabled us to produce narrow tracks with varying widths without using special heads. We measured the jitter of microtracks, verified jitter dependence on the effective reader width and established the areal density relationship with BAR.
{"title":"Studies of bit aspect ratio and areal density using microtracks","authors":"M. Xiao, K. Takano, H. Rosen, S. Faruque","doi":"10.1109/NAPMRC.2003.1177037","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177037","url":null,"abstract":"With decreasing trackwidth, track density increases while jitter goes up, limiting the linear density. Overall, we expect a gain in areal density with reducing bit aspect ratio (BAR). In order to create narrow trackwidths thereby achieve small BAR, we utilized the microtrack technique. This novel approach enabled us to produce narrow tracks with varying widths without using special heads. We measured the jitter of microtracks, verified jitter dependence on the effective reader width and established the areal density relationship with BAR.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131097268","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177054
T. Suzuki, K. Ouchi
Perpendicular recording is fundamentally characterized by demagnetizing field free transitions. This principal feature is a great advantage not only for granular type media but also laterally exchange-coupled (LEC) film media with enhanced wall-pinning effects. Recently, it has been first reported that larger M/sub s/ and K/sub u/, high density pinning sites, and thinner recording layer of LEC film media are effective for coexistence of a larger hysteresis loop slope parameter, /spl alpha/, and a smaller domain size. Thus, higher recording and reproducing resolutions and lower media noise are expected to be realized by the media. Since an ordered Fe-Pt alloy of L1/sub 0/ phase satisfies the requirements for the LEC film media, we discuss the potential of thinner Fe-Pt film media for perpendicular magnetic recording.
{"title":"Possibilities of Fe-Pt media for ultra-high density perpendicular magnetic recording","authors":"T. Suzuki, K. Ouchi","doi":"10.1109/NAPMRC.2003.1177054","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177054","url":null,"abstract":"Perpendicular recording is fundamentally characterized by demagnetizing field free transitions. This principal feature is a great advantage not only for granular type media but also laterally exchange-coupled (LEC) film media with enhanced wall-pinning effects. Recently, it has been first reported that larger M/sub s/ and K/sub u/, high density pinning sites, and thinner recording layer of LEC film media are effective for coexistence of a larger hysteresis loop slope parameter, /spl alpha/, and a smaller domain size. Thus, higher recording and reproducing resolutions and lower media noise are expected to be realized by the media. Since an ordered Fe-Pt alloy of L1/sub 0/ phase satisfies the requirements for the LEC film media, we discuss the potential of thinner Fe-Pt film media for perpendicular magnetic recording.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133139070","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177016
Wen Jiang, M. Williams, N. Smith, W. Weresin, K. Kuroki, Y. Ikeda, K. Takano, G. Khera, R. Wood
As areal densities increase and track-widths become narrower, adjacent-track interference (ATI) is becoming a major engineering concern in magnetic recording systems. In perpendicular recording, the nature of ATI is more complex due to the novel head designs and the soft underlayer. ATI arises when stray fields from the sides of a head cause erasure or create interference on an adjacent track. To uncover the sources of ATI in perpendicular systems, we developed a method using DC erase noise to identify the polarity as well as the extent and magnitude of the stray fields. This paper extends this earlier work to explain some of the puzzling phenomena that were observed and explores further the general ATI issues such as rate of signal decay with multiple writes and ultimately the impact on error-rate.
{"title":"Investigations on adjacent-track interference in perpendicular recording systems","authors":"Wen Jiang, M. Williams, N. Smith, W. Weresin, K. Kuroki, Y. Ikeda, K. Takano, G. Khera, R. Wood","doi":"10.1109/NAPMRC.2003.1177016","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177016","url":null,"abstract":"As areal densities increase and track-widths become narrower, adjacent-track interference (ATI) is becoming a major engineering concern in magnetic recording systems. In perpendicular recording, the nature of ATI is more complex due to the novel head designs and the soft underlayer. ATI arises when stray fields from the sides of a head cause erasure or create interference on an adjacent track. To uncover the sources of ATI in perpendicular systems, we developed a method using DC erase noise to identify the polarity as well as the extent and magnitude of the stray fields. This paper extends this earlier work to explain some of the puzzling phenomena that were observed and explores further the general ATI issues such as rate of signal decay with multiple writes and ultimately the impact on error-rate.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115721560","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177053
K. Takano, M. Xiao, H. Do, S. Faruque, E. Fullerton
The authors discuss work on the magnetic characterization and recording performance of Co/Pd multilayers deposited on various soft underlayer (SUL) and exchange break layer (EBL) structures. The dependence of various recording parametrics were measured as a function of the SUL and EBL thickness and the dimensions of the pole head were investigated. Significant issues behind the transition from dual layer to single layer perpendicular recording are also discussed.
{"title":"Multilayer media:role of the exchange break layer and soft underlayer thicknesses","authors":"K. Takano, M. Xiao, H. Do, S. Faruque, E. Fullerton","doi":"10.1109/NAPMRC.2003.1177053","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177053","url":null,"abstract":"The authors discuss work on the magnetic characterization and recording performance of Co/Pd multilayers deposited on various soft underlayer (SUL) and exchange break layer (EBL) structures. The dependence of various recording parametrics were measured as a function of the SUL and EBL thickness and the dimensions of the pole head were investigated. Significant issues behind the transition from dual layer to single layer perpendicular recording are also discussed.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117153886","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177008
S. Iwasaki
One hundred years of magnetic recording from the invention of "Telegraphone" by V. Poulsen in 1898 is the history of continuous development that has migrated from wires to tapes to disks. From the historical view of the magnetic recording, it was deduced that an invention needs more than 20 years before its worldwide application and that major technological innovations take place with a periodicity of about 40 years. The latter period would be related to the generation change. The change from in-plane to perpendicular magnetic recording system seems very reasonable from the historical view. The technology should play a fundamental role in information storage systems in the first half of 21st century.
{"title":"Learning from historical view of the progress in magnetic recording","authors":"S. Iwasaki","doi":"10.1109/NAPMRC.2003.1177008","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177008","url":null,"abstract":"One hundred years of magnetic recording from the invention of \"Telegraphone\" by V. Poulsen in 1898 is the history of continuous development that has migrated from wires to tapes to disks. From the historical view of the magnetic recording, it was deduced that an invention needs more than 20 years before its worldwide application and that major technological innovations take place with a periodicity of about 40 years. The latter period would be related to the generation change. The change from in-plane to perpendicular magnetic recording system seems very reasonable from the historical view. The technology should play a fundamental role in information storage systems in the first half of 21st century.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"08 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123643182","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177039
T. Shimatsu, T. Oikawa, Y. Inaba, H. Muraoka, Y. Nakamura
Magnetic cluster size of perpendicular recording media, which is a dominant factor for media noise was discussed relating to activation volume, the slope of magnetization curves, and remanence coercivity.
{"title":"Magnetic cluster size and magnetization curves in perpendicular recording media","authors":"T. Shimatsu, T. Oikawa, Y. Inaba, H. Muraoka, Y. Nakamura","doi":"10.1109/NAPMRC.2003.1177039","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177039","url":null,"abstract":"Magnetic cluster size of perpendicular recording media, which is a dominant factor for media noise was discussed relating to activation volume, the slope of magnetization curves, and remanence coercivity.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130776355","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177060
J. Harrell, S. Wang, S. Brown
Thermal relaxation of the magnetization is a critical issue in ultra-high density recording media. The thermal stability is typically characterized by measuring the time dependence of the coercivity or by measuring the magnetization decay as a function of the reverse field after saturation. The relaxation is usually given in terms of a magnetic viscosity coefficient. The viscosity is usually greatest near the coercivity, and for large thermal stability factors, it is usually very small in zero applied field. We have recently reported zero field relaxation (ZFR) measurements in a variety of films, including longitudinal media, perpendicular media, and particulate films The measurements were made in zero field as a function of the initial remanent magnetization obtained after applying a saturation-reverse-zero field sequence.
{"title":"Zero field relaxation measurements in magnetic recording media","authors":"J. Harrell, S. Wang, S. Brown","doi":"10.1109/NAPMRC.2003.1177060","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177060","url":null,"abstract":"Thermal relaxation of the magnetization is a critical issue in ultra-high density recording media. The thermal stability is typically characterized by measuring the time dependence of the coercivity or by measuring the magnetization decay as a function of the reverse field after saturation. The relaxation is usually given in terms of a magnetic viscosity coefficient. The viscosity is usually greatest near the coercivity, and for large thermal stability factors, it is usually very small in zero applied field. We have recently reported zero field relaxation (ZFR) measurements in a variety of films, including longitudinal media, perpendicular media, and particulate films The measurements were made in zero field as a function of the initial remanent magnetization obtained after applying a saturation-reverse-zero field sequence.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126977799","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177009
Y. Tanaka, Mikhail Amelyushkin, K. Shimomura
We have studied the integration of the perpendicular recording system and a hard disk drive (HDD). Double layer perpendicular media and a single-pole type perpendicular head were employed in a 2.5" HDD along with a channel featuring differential equalization. As a result of the integration test, it was confirmed that perpendicular recording 2.5" HDDs functioned sufficiently as prototype drives with a capacity of 30 GB/pl or 52 Gbits/in/sup 2/ in terms of recording density. In looking thoroughly at the read/write performance of perpendicular recording through the drive integration study, some fundamental behavior and features have been identified. When we compared them side by side with those of familiar longitudinal recording system, it is revealed that, in drive integration mode, perpendicular recording and longitudinal recording showed a complementary relationship.
{"title":"Perpendicular recording and the complementary features in integration","authors":"Y. Tanaka, Mikhail Amelyushkin, K. Shimomura","doi":"10.1109/NAPMRC.2003.1177009","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177009","url":null,"abstract":"We have studied the integration of the perpendicular recording system and a hard disk drive (HDD). Double layer perpendicular media and a single-pole type perpendicular head were employed in a 2.5\" HDD along with a channel featuring differential equalization. As a result of the integration test, it was confirmed that perpendicular recording 2.5\" HDDs functioned sufficiently as prototype drives with a capacity of 30 GB/pl or 52 Gbits/in/sup 2/ in terms of recording density. In looking thoroughly at the read/write performance of perpendicular recording through the drive integration study, some fundamental behavior and features have been identified. When we compared them side by side with those of familiar longitudinal recording system, it is revealed that, in drive integration mode, perpendicular recording and longitudinal recording showed a complementary relationship.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127774217","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 : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177072
M. Kryder
This paper gives a general overview of magnetic storage technology future trends. Areas covered include: perpendicular recording; magnetic head design; heat assisted magnetic recording (HAMR); media anisotropy; magnetic material isolated island patterned media; magnetic nanoparticle self-ordered arrays; and head-disk interface spacing.
{"title":"Future trends in magnetic storage technology","authors":"M. Kryder","doi":"10.1109/NAPMRC.2003.1177072","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177072","url":null,"abstract":"This paper gives a general overview of magnetic storage technology future trends. Areas covered include: perpendicular recording; magnetic head design; heat assisted magnetic recording (HAMR); media anisotropy; magnetic material isolated island patterned media; magnetic nanoparticle self-ordered arrays; and head-disk interface spacing.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130824261","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：