Pub Date : 2003-01-06DOI: 10.1109/NAPMRC.2003.1177032
T. Asahi, M. Tanaka, J. Sayama, J. Kawaji, T. Osaka, S. Matsunuma
[CoB/Pd]/sub n/ films were prepared with dc magnetron sputtering and the effect of preparation conditions, the addition of N/sub 2/ to Ar gas and heating of substrates during the deposition, on its microstructure and magnetic properties were examined.
采用直流磁控溅射法制备了[CoB/Pd]/sub - n/薄膜，考察了制备条件、氩气中加入n/ sub - 2/以及沉积过程中衬底加热对薄膜微观结构和磁性能的影响。
{"title":"Fabrication of [CoB/Pd]/sub n/ multilayered perpendicular magnetic recording media using DC magnetron sputtering with N/sub 2/","authors":"T. Asahi, M. Tanaka, J. Sayama, J. Kawaji, T. Osaka, S. Matsunuma","doi":"10.1109/NAPMRC.2003.1177032","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177032","url":null,"abstract":"[CoB/Pd]/sub n/ films were prepared with dc magnetron sputtering and the effect of preparation conditions, the addition of N/sub 2/ to Ar gas and heating of substrates during the deposition, on its microstructure and magnetic properties were examined.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"322 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":"124296393","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.2003.1177035
B. Azzerboni, M. Carpentieri, M. Finocchio, F. La Foresta
In this paper, we investigate the use of super-Lorentzian, Lorentzian and sub-Lorentzian function, super-Gaussian, Gaussian and sub-Gaussian function to determine the irreversible magnetization by classical scalar Preisach model.
{"title":"Experimental characterization of reversible magnetization by classical scalar Preisach model","authors":"B. Azzerboni, M. Carpentieri, M. Finocchio, F. La Foresta","doi":"10.1109/NAPMRC.2003.1177035","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177035","url":null,"abstract":"In this paper, we investigate the use of super-Lorentzian, Lorentzian and sub-Lorentzian function, super-Gaussian, Gaussian and sub-Gaussian function to determine the irreversible magnetization by classical scalar Preisach model.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"39 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":"134241801","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.2003.1177013
B. Wilson
In order to use a magnetic recording system to store data many issues must be addressed. Inter-symbol interference, media noise, head and electronics noise and various nonlinear distortions all compromise reliable detector performance. The set of issues is the same regardless of whether the medium is magnetized in a longitudinal or a perpendicular direction. Likewise the same basic partial-response maximum-likelihood detector architecture is appropriate for both longitudinal and perpendicular recording. Details of the recording system such as the transition response, the noise power spectral density and the nature of the nonlinearities do differ greatly between longitudinal and perpendicular recording. The details of the signal processing implementation must change to accommodate these differences.
{"title":"Signal processing for perpendicular recording","authors":"B. Wilson","doi":"10.1109/NAPMRC.2003.1177013","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177013","url":null,"abstract":"In order to use a magnetic recording system to store data many issues must be addressed. Inter-symbol interference, media noise, head and electronics noise and various nonlinear distortions all compromise reliable detector performance. The set of issues is the same regardless of whether the medium is magnetized in a longitudinal or a perpendicular direction. Likewise the same basic partial-response maximum-likelihood detector architecture is appropriate for both longitudinal and perpendicular recording. Details of the recording system such as the transition response, the noise power spectral density and the nature of the nonlinearities do differ greatly between longitudinal and perpendicular recording. The details of the signal processing implementation must change to accommodate these differences.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"52 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":"134049584","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.2003.1177047
P. Kovintavewat, M. Fatih Erden, E. Kurtas, J. Barry
We propose and investigate the performance of an FSE (oversampled) system in longitudinal and perpendicular recording channels. Results show that the proposed system outperforms the conventional (symbol rate) one whenever there is excess bandwidth, like in longitudinal recording.
{"title":"Employing fractionally-spaced equalizers (FSE) for magnetic recording channels","authors":"P. Kovintavewat, M. Fatih Erden, E. Kurtas, J. Barry","doi":"10.1109/NAPMRC.2003.1177047","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177047","url":null,"abstract":"We propose and investigate the performance of an FSE (oversampled) system in longitudinal and perpendicular recording channels. Results show that the proposed system outperforms the conventional (symbol rate) one whenever there is excess bandwidth, like in longitudinal recording.","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":"133501673","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.2003.1177069
N. Ota, S. Matsunuma, T. Takeuchi, H. Daimon, N. Inaba, H. Awano
Magnetic recording will face very serious problems beyond Tera bit/in/sup 2/, such as: recorded bit thermal stability in a size range of less than 20 nm×30 nm; very strong magnetic field necessary to write on a high coercive media, estimated over 15 kOe; write frequency limited to a few GHz, depending on the natural resonance of the magnetic material. In a hybrid recording scheme, writing is done at a high temperature around 150-230 °C, while archiving at room temperature. Such a simple concept brings solutions to solve the above difficulties. This paper outlines various hybrid recording device configurations and checks out the applicability of several materials for this type of application.
{"title":"Hybrid recording features and material candidates beyond Tera bit/in/sup 2/","authors":"N. Ota, S. Matsunuma, T. Takeuchi, H. Daimon, N. Inaba, H. Awano","doi":"10.1109/NAPMRC.2003.1177069","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177069","url":null,"abstract":"Magnetic recording will face very serious problems beyond Tera bit/in/sup 2/, such as: recorded bit thermal stability in a size range of less than 20 nm×30 nm; very strong magnetic field necessary to write on a high coercive media, estimated over 15 kOe; write frequency limited to a few GHz, depending on the natural resonance of the magnetic material. In a hybrid recording scheme, writing is done at a high temperature around 150-230 °C, while archiving at room temperature. Such a simple concept brings solutions to solve the above difficulties. This paper outlines various hybrid recording device configurations and checks out the applicability of several materials for this type of application.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"78 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":"122350842","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.2003.1177031
J. Kawaji, T. Asahi, H. Hashimoto, J. Hokkyo, T. Osaka, S. Matsunuma
In this study, the Pd/Si dual layer is applied to the intermediate layer of [Co/Pd]/sub n//CoZrNb double-layered media, and the effect of preparation conditions as described on the microstructure of [Co/Pd]/sub n/ film and the seedlayer, and on the magnetic properties of the [Co/Pd]/sub n/ film were investigated.
{"title":"Effect of preparation conditions of Pd/Si dual seedlayer on the microstructure of [Co/Pd]/sub n/ double-layered perpendicular magnetic recording media","authors":"J. Kawaji, T. Asahi, H. Hashimoto, J. Hokkyo, T. Osaka, S. Matsunuma","doi":"10.1109/NAPMRC.2003.1177031","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177031","url":null,"abstract":"In this study, the Pd/Si dual layer is applied to the intermediate layer of [Co/Pd]/sub n//CoZrNb double-layered media, and the effect of preparation conditions as described on the microstructure of [Co/Pd]/sub n/ film and the seedlayer, and on the magnetic properties of the [Co/Pd]/sub n/ film were investigated.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"410 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":"121954872","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.2003.1177022
S. Nakagawa, T. Okamoto, S. Kong
The soft magnetic underlayer (SUL) with high saturation magnetization in perpendicular magnetic recording media have been required essentially to achieve high recording density with high bit stability. However, stripe domain configuration caused by the induced perpendicular magnetic anisotropy and deterioration of surface smoothness in thick SULs degrades the recording performance. In this study, multilayers, with several kinds of interlayers for the SUL, were prepared in order to improve the soft magnetic properties and surface smoothness as well as reduce the media noise originated from the domain configuration.
{"title":"Multilayered soft magnetic underlayers for perpendicular magnetic recording media","authors":"S. Nakagawa, T. Okamoto, S. Kong","doi":"10.1109/NAPMRC.2003.1177022","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177022","url":null,"abstract":"The soft magnetic underlayer (SUL) with high saturation magnetization in perpendicular magnetic recording media have been required essentially to achieve high recording density with high bit stability. However, stripe domain configuration caused by the induced perpendicular magnetic anisotropy and deterioration of surface smoothness in thick SULs degrades the recording performance. In this study, multilayers, with several kinds of interlayers for the SUL, were prepared in order to improve the soft magnetic properties and surface smoothness as well as reduce the media noise originated from the domain configuration.","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":"122138737","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.2003.1177033
C. Shern, C. Su, H. Ho, R. Chen
Two anomalous magnetic properties were observed when Co ultrathin films on Pt(111) were capped with Ag overlayers: the out-of-plane magnetization has a significant enhancement after annealing at high temperatures, and the spin reorientation transition (SRT) can be induced.
{"title":"Anomalous magnetic properties of Co thin films on Pt(111) capped Ag overlayers","authors":"C. Shern, C. Su, H. Ho, R. Chen","doi":"10.1109/NAPMRC.2003.1177033","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177033","url":null,"abstract":"Two anomalous magnetic properties were observed when Co ultrathin films on Pt(111) were capped with Ag overlayers: the out-of-plane magnetization has a significant enhancement after annealing at high temperatures, and the spin reorientation transition (SRT) can be induced.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"15 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":"126291565","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.2003.1177041
P. Kappenberger, H. Hug, S. Martin, H. Guntherodt, D. Buchel, J. Ahner, D. Weller
The Magnetic Force Microscope (MFM) has become a major tool for characterizing and evaluating read and write heads, written tracks and material performance in magnetic data storage. However, standard MFM techniques suffer from the following problems that limit their application to image the bit structure as the storage density advances towards 1 Tbit/in/sup 2/: the lack of lateral resolution and measurement sensitivity on a nanometer scale; the difficulty of relating the measured signal to the stray field; and the ability to separate the topography and magnetic signal. The techniques to obtain a high lateral resolution and achieve a complete separation of topography and magnetism, were developed with sophisticated MFMs built for fundamental research. These instruments are not suitable for industrial applications due to their complexity and restrictions regarding the sample size. In order to overcome these limitations a novel room temperature MFM (QMFM), with a focus on industrial standard applications, has been developed at the University of. Basel.
{"title":"A novel high resolution quantitative magnetic force microscope for hard disk research","authors":"P. Kappenberger, H. Hug, S. Martin, H. Guntherodt, D. Buchel, J. Ahner, D. Weller","doi":"10.1109/NAPMRC.2003.1177041","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177041","url":null,"abstract":"The Magnetic Force Microscope (MFM) has become a major tool for characterizing and evaluating read and write heads, written tracks and material performance in magnetic data storage. However, standard MFM techniques suffer from the following problems that limit their application to image the bit structure as the storage density advances towards 1 Tbit/in/sup 2/: the lack of lateral resolution and measurement sensitivity on a nanometer scale; the difficulty of relating the measured signal to the stray field; and the ability to separate the topography and magnetic signal. The techniques to obtain a high lateral resolution and achieve a complete separation of topography and magnetism, were developed with sophisticated MFMs built for fundamental research. These instruments are not suitable for industrial applications due to their complexity and restrictions regarding the sample size. In order to overcome these limitations a novel room temperature MFM (QMFM), with a focus on industrial standard applications, has been developed at the University of. Basel.","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":"127859410","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.2003.1177045
H. Shute, D. Wilton, D. McKirdy, D. Mapps
This paper presents a highly accurate method of obtaining approximate field components for a 2D perpendicular magnetic recording head in the presence of a soft magnetic underlayer. It is easy to use and may be applied to any configuration of rectangular poles, shields and gaps.
{"title":"Improved approximations for 2-D perpendicular recording heads","authors":"H. Shute, D. Wilton, D. McKirdy, D. Mapps","doi":"10.1109/NAPMRC.2003.1177045","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177045","url":null,"abstract":"This paper presents a highly accurate method of obtaining approximate field components for a 2D perpendicular magnetic recording head in the presence of a soft magnetic underlayer. It is easy to use and may be applied to any configuration of rectangular poles, shields and gaps.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"32 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":"126610857","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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