Pub Date : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177046
D. Wilton, D. McKirdy, H. Shute, J. Miles, D. Mapps
In order to achieve areal densities in magnetic recording of the order of 1 Tbit/in/sup 2/ it has been suggested that a feasible system, based on current technologies, will involve a perpendicular head and a perpendicular medium with a soft magnetic underlayer. Micromagnetic modelling plays an important role in the design and analysis of recording systems and within any such calculation it is necessary to have accurate data on the magnetic field produced by the head. Numerical finite element and finite difference calculations are computationally intensive, particularly in 3D, but progress is now being made with 3D analytic models which take the magnetic underlayer into account. This paper reports on progress in that direction and in particular considers the geometry of a double-shielded perpendicular single pole head.
为了使磁记录的面密度达到1 Tbit/ In /sup / 2/，根据目前的技术，一个可行的系统将包括一个垂直的磁头和一个具有软磁底层的垂直介质。微磁建模在记录系统的设计和分析中起着重要的作用，在任何这样的计算中，有必要获得由磁头产生的磁场的准确数据。数值有限元和有限差分计算是计算密集型的，特别是在3D中，但是现在在考虑磁性底层的3D分析模型方面取得了进展。本文报道了这方面的进展，并特别考虑了双屏蔽垂直单极头的几何形状。
{"title":"3-D head field modeling for perpendicular magnetic recording","authors":"D. Wilton, D. McKirdy, H. Shute, J. Miles, D. Mapps","doi":"10.1109/NAPMRC.2003.1177046","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177046","url":null,"abstract":"In order to achieve areal densities in magnetic recording of the order of 1 Tbit/in/sup 2/ it has been suggested that a feasible system, based on current technologies, will involve a perpendicular head and a perpendicular medium with a soft magnetic underlayer. Micromagnetic modelling plays an important role in the design and analysis of recording systems and within any such calculation it is necessary to have accurate data on the magnetic field produced by the head. Numerical finite element and finite difference calculations are computationally intensive, particularly in 3D, but progress is now being made with 3D analytic models which take the magnetic underlayer into account. This paper reports on progress in that direction and in particular considers the geometry of a double-shielded perpendicular single pole head.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"6 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":"130076415","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.2003.1177010
Y. Wu, G. Lin, T. Huang
Perpendicular recording is considered to have the potential to replace longitudinal recording when it runs out of steam. There has been renewed interest in the study of perpendicular recording systems. Our work focuses on the complete drive integration using perpendicular recording technology. Various aspects of drive integration activities are discussed, with emphasis on phenomena that are unique to perpendicular drive integration.
{"title":"Progress in perpendicular drive integration","authors":"Y. Wu, G. Lin, T. Huang","doi":"10.1109/NAPMRC.2003.1177010","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177010","url":null,"abstract":"Perpendicular recording is considered to have the potential to replace longitudinal recording when it runs out of steam. There has been renewed interest in the study of perpendicular recording systems. Our work focuses on the complete drive integration using perpendicular recording technology. Various aspects of drive integration activities are discussed, with emphasis on phenomena that are unique to perpendicular drive integration.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"83 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":"131940917","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.2003.1177042
E. Svedberg, D. Litvinov, R. Gustafson, C. Chang, S. Khizroev
Today, one of the most critical issues in implementing perpendicular recording is believed to be the excessive sensitivity of a typical perpendicular recording system to the skew angle. In perpendicular data storage, the recording is expected to be produced in the effective gap near the trailing edge of the main pole of a single pole head (SPH). In this paper, magnetic force microscopy (MFM) is utilized to study the skew angle effects in perpendicular media with a CoCr-based hard layer and a Permalloy soft underlayer.
{"title":"Magnetic force microscopy measurements of skew angle dependencies in perpendicular media","authors":"E. Svedberg, D. Litvinov, R. Gustafson, C. Chang, S. Khizroev","doi":"10.1109/NAPMRC.2003.1177042","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177042","url":null,"abstract":"Today, one of the most critical issues in implementing perpendicular recording is believed to be the excessive sensitivity of a typical perpendicular recording system to the skew angle. In perpendicular data storage, the recording is expected to be produced in the effective gap near the trailing edge of the main pole of a single pole head (SPH). In this paper, magnetic force microscopy (MFM) is utilized to study the skew angle effects in perpendicular media with a CoCr-based hard layer and a Permalloy soft underlayer.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"18 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":"114817908","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}
In the never-ending quest for higher areal recording density, perpendicular recording is viewed as the most likely candidate to supplant longitudinal recording. However, currently perpendicular recording is lagging longitudinal recording in terms of areal density by almost a factor of two. It is generally believed that the lack of optimized perpendicular head and media is hindering the progress of perpendicular recording in spite of its theoretical advantages. Recently, so-called oxide perpendicular media have become available. In such media, the perpendicularly oriented magnetic grains are physically isolated, e.g., in a SiO/sub 2/ phase, thus ensuring magnetic decoupling between the grains. This paper compares the recording performance of conventional and oxide perpendicular media, showing that the latter hold the promise of bridging the gap to longitudinal recording.
{"title":"High linear density in perpendicular recording","authors":"D. Guarisco, H. Nguy","doi":"10.1063/1.1557713","DOIUrl":"https://doi.org/10.1063/1.1557713","url":null,"abstract":"In the never-ending quest for higher areal recording density, perpendicular recording is viewed as the most likely candidate to supplant longitudinal recording. However, currently perpendicular recording is lagging longitudinal recording in terms of areal density by almost a factor of two. It is generally believed that the lack of optimized perpendicular head and media is hindering the progress of perpendicular recording in spite of its theoretical advantages. Recently, so-called oxide perpendicular media have become available. In such media, the perpendicularly oriented magnetic grains are physically isolated, e.g., in a SiO/sub 2/ phase, thus ensuring magnetic decoupling between the grains. This paper compares the recording performance of conventional and oxide perpendicular media, showing that the latter hold the promise of bridging the gap to longitudinal recording.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"53 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":"127082977","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.2003.1177019
H. J. Richter, E. Champion, Q. Peng
Recording media experience the superparamagnetic effect as a fundamental limit. To achieve a maximum signal-to-noise ratio, SNR, the grains in the media need to be as small as possible. Very small grains are susceptible to thermal instabilities if the magnetic energy that resists magnetization reversal, is too small when compared to the thermal energy. Within the constraint of thermal stability and write-ability, the SNR of longitudinal media can no longer be advanced significantly. These difficulties have prompted a renewed interest in perpendicular recording. Perpendicular recording faces the same fundamental problem: the generation of SNR under the constraint of adequate write-ability and thermal stability. The most promising design of a perpendicular recording system uses a magnetically soft underlayer (SUL), which enhances the recording field. A proper analysis of the two recording modes, longitudinal and perpendicular recording with a pole head, is very complex and has been attempted recently. The analysis has shown that the recording potential of the two modes is roughly similar, although it has to be remarked that perpendicular recording media are more exchange tolerant than longitudinal media and hence it may be conjectured that more of the recording potential can be achieved in practice. To accomplish extremely high-density recording, it is therefore required to achieve a high recording field together with a more favorable recording geometry.
{"title":"Theoretical considerations for extremely high-density perpendicular recording","authors":"H. J. Richter, E. Champion, Q. Peng","doi":"10.1109/NAPMRC.2003.1177019","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177019","url":null,"abstract":"Recording media experience the superparamagnetic effect as a fundamental limit. To achieve a maximum signal-to-noise ratio, SNR, the grains in the media need to be as small as possible. Very small grains are susceptible to thermal instabilities if the magnetic energy that resists magnetization reversal, is too small when compared to the thermal energy. Within the constraint of thermal stability and write-ability, the SNR of longitudinal media can no longer be advanced significantly. These difficulties have prompted a renewed interest in perpendicular recording. Perpendicular recording faces the same fundamental problem: the generation of SNR under the constraint of adequate write-ability and thermal stability. The most promising design of a perpendicular recording system uses a magnetically soft underlayer (SUL), which enhances the recording field. A proper analysis of the two recording modes, longitudinal and perpendicular recording with a pole head, is very complex and has been attempted recently. The analysis has shown that the recording potential of the two modes is roughly similar, although it has to be remarked that perpendicular recording media are more exchange tolerant than longitudinal media and hence it may be conjectured that more of the recording potential can be achieved in practice. To accomplish extremely high-density recording, it is therefore required to achieve a high recording field together with a more favorable recording geometry.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"63 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":"123833216","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.2003.1177034
B. Azzerboni, E. Cardelli, G. Finocchio, F. La Foresta
In the framework of rate-independent magnetization, this paper deals with an alternative approach to the bi-dimensional m-model, which uses analytical Preisach function instead of numerical characterization. Starting from the knowledge of experimental major loop for easy and hard axes we are able to characterize the parameters of the Lorentzian function.
{"title":"Irreversible and reversible magnetization of soft steels for hard and easy axes","authors":"B. Azzerboni, E. Cardelli, G. Finocchio, F. La Foresta","doi":"10.1109/NAPMRC.2003.1177034","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177034","url":null,"abstract":"In the framework of rate-independent magnetization, this paper deals with an alternative approach to the bi-dimensional m-model, which uses analytical Preisach function instead of numerical characterization. Starting from the knowledge of experimental major loop for easy and hard axes we are able to characterize the parameters of the Lorentzian function.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"53 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":"121840471","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.2003.1177058
E. Fullerton, O. Hellwig, S. Kevan, L. Sorensen, J. Kortright
We have applied resonant SAS to characterize the chemical and magnetic heterogeneity of Co-based multilayers as well as CoPtCr-based perpendicular and longitudinal media. Separation of the chemical vs. magnetic heterogeneity is achieved by tuning the x-ray energy to both the Co and Cr edges.
{"title":"Resonant soft x-ray scattering from magnetic thin films","authors":"E. Fullerton, O. Hellwig, S. Kevan, L. Sorensen, J. Kortright","doi":"10.1109/NAPMRC.2003.1177058","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177058","url":null,"abstract":"We have applied resonant SAS to characterize the chemical and magnetic heterogeneity of Co-based multilayers as well as CoPtCr-based perpendicular and longitudinal media. Separation of the chemical vs. magnetic heterogeneity is achieved by tuning the x-ray energy to both the Co and Cr edges.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"69 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":"114578361","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.2003.1177027
S. Yamamoto, H. Wada, H. Kuniki, H. Kurisu, M. Matsuura
Spinel ferrite thin-film is promising as perpendicular magnetic recording (PMR) media for high density recording because an overcoat protective is not necessary. We have already reported on the low temperature preparation and the magnetic and recording characteristics of Co-containing spinel ferrite thin-film single-layer perpendicular media. The introduction of a soft magnetic layer as a backlayer is essential to improve the recording and reproducing performance of the media. In this study, the preparation method of Ni-Zn spinel ferrite thin-films for the backlayer of PMR media, using a reactive sputtering method utilizing an electron-cyclotron-resonance (ECR) microwave plasma, was investigated and a Co-containing spinel ferrite/Ni-Zn ferrite double-layer PMR medium was fabricated as a trial.
{"title":"Preparation of Co-containing spinel ferrite/Mn-Zn ferrite double-layer perpendicular recording media","authors":"S. Yamamoto, H. Wada, H. Kuniki, H. Kurisu, M. Matsuura","doi":"10.1109/NAPMRC.2003.1177027","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177027","url":null,"abstract":"Spinel ferrite thin-film is promising as perpendicular magnetic recording (PMR) media for high density recording because an overcoat protective is not necessary. We have already reported on the low temperature preparation and the magnetic and recording characteristics of Co-containing spinel ferrite thin-film single-layer perpendicular media. The introduction of a soft magnetic layer as a backlayer is essential to improve the recording and reproducing performance of the media. In this study, the preparation method of Ni-Zn spinel ferrite thin-films for the backlayer of PMR media, using a reactive sputtering method utilizing an electron-cyclotron-resonance (ECR) microwave plasma, was investigated and a Co-containing spinel ferrite/Ni-Zn ferrite double-layer PMR medium was fabricated as a trial.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"30 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":"116962648","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.2003.1177056
Byung-Kyu Lee, H. Oh, K.J. Lee, N. Park
To achieve both the high anisotropy energy and high SNR performance at ultra high areal recording density, we have studied paired recording layered PMR media named as hybrid media. Hybrid media consist of 1/sup st/ recording layer and 2/sup nd/ recording layer. 1/sup st/ recording layer and 2/sup nd/ recording layer have low noise properties and high anisotropy energy, respectively. 1/sup st/ and 2/sup nd/ recording layer are continuously and coherently stacked on the top of the underlayer.
{"title":"New design of perpendicular magnetic recording media: hybrid media","authors":"Byung-Kyu Lee, H. Oh, K.J. Lee, N. Park","doi":"10.1109/NAPMRC.2003.1177056","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177056","url":null,"abstract":"To achieve both the high anisotropy energy and high SNR performance at ultra high areal recording density, we have studied paired recording layered PMR media named as hybrid media. Hybrid media consist of 1/sup st/ recording layer and 2/sup nd/ recording layer. 1/sup st/ recording layer and 2/sup nd/ recording layer have low noise properties and high anisotropy energy, respectively. 1/sup st/ and 2/sup nd/ recording layer are continuously and coherently stacked on the top of the underlayer.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"249 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":"123031266","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.2003.1177064
N. Tabat, M. Plumer, A. Shukh, S. Bozeman, N. Amin, C. Pang, T. Pokhil, P. Lu, R. Michel, N. Sharma, M. Kautzky, A. Johnston, E. Murdock
Significant progress has been made within the past year on perpendicular recording technology development and its application to Winchester type disc drives. Paced by rapid advancements in the perpendicular recording physics understanding, component design and fabrication technology has made great strides toward closing the performance gap with the more mature longitudinal recording technology. In particular, closer examination of the combined heads and media parameters and their interdependence and interactions has been instrumental in enabling the recent perpendicular recording areal density and data rate achievements. Concurrently, integration of these advanced components in disc drives has provided valuable information on system level performance issues and has accelerated component design maturity.
{"title":"Perpendicular recording heads for high areal density and high data rate applications","authors":"N. Tabat, M. Plumer, A. Shukh, S. Bozeman, N. Amin, C. Pang, T. Pokhil, P. Lu, R. Michel, N. Sharma, M. Kautzky, A. Johnston, E. Murdock","doi":"10.1109/NAPMRC.2003.1177064","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177064","url":null,"abstract":"Significant progress has been made within the past year on perpendicular recording technology development and its application to Winchester type disc drives. Paced by rapid advancements in the perpendicular recording physics understanding, component design and fabrication technology has made great strides toward closing the performance gap with the more mature longitudinal recording technology. In particular, closer examination of the combined heads and media parameters and their interdependence and interactions has been instrumental in enabling the recent perpendicular recording areal density and data rate achievements. Concurrently, integration of these advanced components in disc drives has provided valuable information on system level performance issues and has accelerated component design maturity.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"24 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":"121594354","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：