Pub Date : 2004-02-19DOI: 10.1109/NAPMRC.2003.1177055
R. Mukai, T. Uzumaki, A. Tanaka
A monolayer of closely packed FePt islands has been produced by thermally created mass transport of ultra-thin FePt film, whereby the formation of a magnetic layer composed of a 2D arrangement of magnetic grains for a decrease of the magnetic coupling between the grains can be realized. Ordered FePt binary alloy films with a tetragonal L1/sub 0/ structure have received significant attention because of the high magnetic anisotropy and, thus, the potential application in high density recording media. The formation of granular films composed of a 3D arrangement of L1/sub 0/-FePt ordered grains with [001] orientation in MgO film has been achieved by stacking the FePt-island/MgO bilayers for high-density perpendicular-magnetic-recording media.
{"title":"Monolayer of closely packed FePt islands with a tetragonal L1/sub 0/ structure produced by thermally created mass transport","authors":"R. Mukai, T. Uzumaki, A. Tanaka","doi":"10.1109/NAPMRC.2003.1177055","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177055","url":null,"abstract":"A monolayer of closely packed FePt islands has been produced by thermally created mass transport of ultra-thin FePt film, whereby the formation of a magnetic layer composed of a 2D arrangement of magnetic grains for a decrease of the magnetic coupling between the grains can be realized. Ordered FePt binary alloy films with a tetragonal L1/sub 0/ structure have received significant attention because of the high magnetic anisotropy and, thus, the potential application in high density recording media. The formation of granular films composed of a 3D arrangement of L1/sub 0/-FePt ordered grains with [001] orientation in MgO film has been achieved by stacking the FePt-island/MgO bilayers for high-density perpendicular-magnetic-recording media.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124258940","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 : 2003-07-15DOI: 10.1109/NAPMRC.2003.1177065
P. George, K. Yamakawa, K. Ise, N. Honda, K. Ouchi
As the rigid disk drive industry has progressed to higher RPM to improve access times via latency reduction, the need for higher performance write and read channel electronics as well as heads has arisen. It appears that perpendicular recording is becoming a next generation candidate as a result of its advantage over longitudinal recording in the area of thermal stability. It is the ultimate frequency response of the head impedance that we wish to explore in this paper and measurements of the high frequency inductance can be used to provide considerable insight into the potential performance of recording heads. The cusp-field single pole head has several unique features that make it worthy of study. This paper is based upon the experimental procedure of first characterizing the head alone followed by the inclusion of the medium and its underlayer. Finally, frequency response comparisons are made between a commercial longitudinal recording head and several low turn cusp-field heads. The conclusions provide a practical bit rate limit for the cusp-field head based on the modeling results, experimental high frequency inductance data, and spin reversal.
{"title":"High frequency inductance measurements and performance projections made for cusp-field single pole heads","authors":"P. George, K. Yamakawa, K. Ise, N. Honda, K. Ouchi","doi":"10.1109/NAPMRC.2003.1177065","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177065","url":null,"abstract":"As the rigid disk drive industry has progressed to higher RPM to improve access times via latency reduction, the need for higher performance write and read channel electronics as well as heads has arisen. It appears that perpendicular recording is becoming a next generation candidate as a result of its advantage over longitudinal recording in the area of thermal stability. It is the ultimate frequency response of the head impedance that we wish to explore in this paper and measurements of the high frequency inductance can be used to provide considerable insight into the potential performance of recording heads. The cusp-field single pole head has several unique features that make it worthy of study. This paper is based upon the experimental procedure of first characterizing the head alone followed by the inclusion of the medium and its underlayer. Finally, frequency response comparisons are made between a commercial longitudinal recording head and several low turn cusp-field heads. The conclusions provide a practical bit rate limit for the cusp-field head based on the modeling results, experimental high frequency inductance data, and spin reversal.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129910640","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.2003.1177014
Sooyoul Hong, Jong-Kyoung Yun, Yong-Won Lee, H. Bang, A. Nazari, Hyungjai Lee
A number of the fundamental issues have been reported, as well as theoretical considerations for perpendicular recording. In the present work, we have successfully demonstrated perpendicular recording of 80 GB/disk hard drive platform, using beveled single pole tip head and double layered perpendicular magnetic media with soft magnetic underlayer. Especially, we focused on the investigation of the drive with the intent to use as much of the existing drive technology as possible.
{"title":"Demonstration on drive integration of 80 GB perpendicular magnetic recording","authors":"Sooyoul Hong, Jong-Kyoung Yun, Yong-Won Lee, H. Bang, A. Nazari, Hyungjai Lee","doi":"10.1109/NAPMRC.2003.1177014","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177014","url":null,"abstract":"A number of the fundamental issues have been reported, as well as theoretical considerations for perpendicular recording. In the present work, we have successfully demonstrated perpendicular recording of 80 GB/disk hard drive platform, using beveled single pole tip head and double layered perpendicular magnetic media with soft magnetic underlayer. Especially, we focused on the investigation of the drive with the intent to use as much of the existing drive technology as possible.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"88 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":"116616737","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.2003.1177023
S. Nakagawa, S. Das
Ferromagnetic Hall effect (FHE) measurement is effective in performing the simultaneous evaluation of a recording layer (RL) with a soft magnetic under layer (SUL), i.e. a double-layered (DL) perpendicular magnetic recording media. A Co-Cr-Ta-Pt(100nm)/Ni-Fe(50mn) thin film, deposited by a facing targets sputtering apparatus, was evaluated using FHE measurement. The manipulation of different FHE responses from the RL and SUL is useful in evaluating their magnetic properties and overcome the limitations confronted by conventional methods.
{"title":"Evaluation of magnetization process and magnetic interactions in the double-layered perpendicular magnetic recording media","authors":"S. Nakagawa, S. Das","doi":"10.1109/NAPMRC.2003.1177023","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177023","url":null,"abstract":"Ferromagnetic Hall effect (FHE) measurement is effective in performing the simultaneous evaluation of a recording layer (RL) with a soft magnetic under layer (SUL), i.e. a double-layered (DL) perpendicular magnetic recording media. A Co-Cr-Ta-Pt(100nm)/Ni-Fe(50mn) thin film, deposited by a facing targets sputtering apparatus, was evaluated using FHE measurement. The manipulation of different FHE responses from the RL and SUL is useful in evaluating their magnetic properties and overcome the limitations confronted by conventional methods.","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":"130374357","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.2003.1177030
Honda N, T. Komakine, K. Ouchi
Perpendicular magnetic recording is one of the most promising systems for ultra-high density recording beyond 200 Gbit/in/sup 2/. Steeper M-H loop slopes of the recording media are indispensable for obtaining a high recording resolution. Introduction of exchange coupling between the adjacent grains in the media is also effective in increasing the loop slope. However, increased exchange coupling generally causes enhanced medium noise due to increased magnetic domain size in the media. On the other hand, the dominant medium noise in double layered perpendicular recording media is the transition noise caused by jitter at the transitions. In this case, the noise could be small when a sharp transition is formed. Therefore, it would be possible to realize low noise media with a high resolution in perpendicular recording media. The low noise mechanism was studied using a simulation analysis.
{"title":"Low noise mechanism in exchange coupled perpendicular recording media","authors":"Honda N, T. Komakine, K. Ouchi","doi":"10.1109/NAPMRC.2003.1177030","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177030","url":null,"abstract":"Perpendicular magnetic recording is one of the most promising systems for ultra-high density recording beyond 200 Gbit/in/sup 2/. Steeper M-H loop slopes of the recording media are indispensable for obtaining a high recording resolution. Introduction of exchange coupling between the adjacent grains in the media is also effective in increasing the loop slope. However, increased exchange coupling generally causes enhanced medium noise due to increased magnetic domain size in the media. On the other hand, the dominant medium noise in double layered perpendicular recording media is the transition noise caused by jitter at the transitions. In this case, the noise could be small when a sharp transition is formed. Therefore, it would be possible to realize low noise media with a high resolution in perpendicular recording media. The low noise mechanism was studied using a simulation analysis.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"3 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":"126818727","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.2003.1177024
Y. Kawada, Y. Ueno, K. Shibata
(Co/Pd)n multi-layers perpendicular recording media have larger perpendicular magnetic anisotropy than CoCr alloy ones and have actively been studied. But in this perpendicular media, the compatibility between low media noise and good thermal stability is required. In this study the possibility of lowering media noise was examined by depositing (Co/Pt)n multi-layers thin films with Ar, Kr or Xe gas and estimating their magnetic properties, film structure and magnetic cluster size. It is shown that the multi-layer perpendicular recording media deposited by Kr or Xe have higher Hc, lower α, smaller magnetic cluster size, smaller Va and the possibility of low media noise.
{"title":"(Co/Pt)n multi-layers perpendicular magnetic recording media deposited by Ar, Kr or Xe gas","authors":"Y. Kawada, Y. Ueno, K. Shibata","doi":"10.1109/NAPMRC.2003.1177024","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177024","url":null,"abstract":"(Co/Pd)n multi-layers perpendicular recording media have larger perpendicular magnetic anisotropy than CoCr alloy ones and have actively been studied. But in this perpendicular media, the compatibility between low media noise and good thermal stability is required. In this study the possibility of lowering media noise was examined by depositing (Co/Pt)n multi-layers thin films with Ar, Kr or Xe gas and estimating their magnetic properties, film structure and magnetic cluster size. It is shown that the multi-layer perpendicular recording media deposited by Kr or Xe have higher Hc, lower α, smaller magnetic cluster size, smaller Va and the possibility of low media noise.","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":"121665206","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.2003.1177038
S.C. Lee, Y. W. Tahk, K. Lee, T.D. Lee
In this work, micromagnetic simulations of the read/write process for perpendicular systems have been performed. In higher recording densities, grain size distribution is more important due to the dependency of thermal decay and SNR on grain size distribution. Therefore the magnetic layer was simulated by a Voronoi cell with different standard deviation of grain sizes. The effect of a soft under layer (SUL) on read/write was calculated by using a cubic cell. For a realistic writing head field, we used the single pole head field calculated by micromagnetics. Width and thickness of the write pole was 60 nm and 160 nm, respectively. Head sweep velocity during the writing process was taken to be 40 m/s. SNR and thermal decay at a linear density of 1058 kfci were calculated as a function of the different standard deviations of grain sizes. Thermal decay over a long time scale was investigated by the Langevin equation and the time-temperature scaling method. SNR is calculated by the reciprocity principle in a shielded magnetoresistive head.
{"title":"Effect of grain size distribution on thermal decay in perpendicular recording with double layered media and single pole head by micromagnetic modeling","authors":"S.C. Lee, Y. W. Tahk, K. Lee, T.D. Lee","doi":"10.1109/NAPMRC.2003.1177038","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177038","url":null,"abstract":"In this work, micromagnetic simulations of the read/write process for perpendicular systems have been performed. In higher recording densities, grain size distribution is more important due to the dependency of thermal decay and SNR on grain size distribution. Therefore the magnetic layer was simulated by a Voronoi cell with different standard deviation of grain sizes. The effect of a soft under layer (SUL) on read/write was calculated by using a cubic cell. For a realistic writing head field, we used the single pole head field calculated by micromagnetics. Width and thickness of the write pole was 60 nm and 160 nm, respectively. Head sweep velocity during the writing process was taken to be 40 m/s. SNR and thermal decay at a linear density of 1058 kfci were calculated as a function of the different standard deviations of grain sizes. Thermal decay over a long time scale was investigated by the Langevin equation and the time-temperature scaling method. SNR is calculated by the reciprocity principle in a shielded magnetoresistive head.","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":"115917680","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.2003.1177040
M. Albrecht, C. Rettner, T. Thomson, G. McClelland, M. Hart, S. Anders, M. Best, B. Terris
The storage density of conventional thin film recording media, where each bit is comprised of several hundred grains, is limited by superparmagnetism, since thermal excitation of the magnetization may degrade recorded information. Patterned magnetic media where magnetic bits are recorded on pre-defined, single-domain islands is one of the proposed approaches for extending magnetic storage densities beyond the limit set by thermal decay for conventional media. In this paper we discuss writing and reading from single domain magnetic islands with a conventional recording head, compare the performance to unpatterned media, and present a possible manufacturable approach to achieving run-scale patterning over disk sized areas.
{"title":"Magnetic recording on patterned media","authors":"M. Albrecht, C. Rettner, T. Thomson, G. McClelland, M. Hart, S. Anders, M. Best, B. Terris","doi":"10.1109/NAPMRC.2003.1177040","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177040","url":null,"abstract":"The storage density of conventional thin film recording media, where each bit is comprised of several hundred grains, is limited by superparmagnetism, since thermal excitation of the magnetization may degrade recorded information. Patterned magnetic media where magnetic bits are recorded on pre-defined, single-domain islands is one of the proposed approaches for extending magnetic storage densities beyond the limit set by thermal decay for conventional media. In this paper we discuss writing and reading from single domain magnetic islands with a conventional recording head, compare the performance to unpatterned media, and present a possible manufacturable approach to achieving run-scale patterning over disk sized areas.","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":"131103499","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.2003.1177071
D. Sarid, B. McCarthy, G. Jabbour
Data storage technology has evolved in two predominant directions in recent years, reflecting the two critical demands of large capacity and fast access. These two directions, embodied by hard disk drives (HDD) for the first direction, and random access memory (RAM) for the second one, have demonstrated phenomenal improvements in performance. The question arises as to whether one can envision an alternative technology that will combine the capacity of an HDD and access time of a RAM, within dimensions on the order of only several mm/sup 2/. A novel approach that is discussed involves the implementation of several concepts that have recently been advanced in the emerging field of nanotechnology. In particular, scanning probe microscopy using a large number of cantilevers operating in parallel offers a unique opportunity that is currently being pursued by several research groups at universities and companies around the world.
{"title":"MEMS-based nano probe technology for data storage applications","authors":"D. Sarid, B. McCarthy, G. Jabbour","doi":"10.1109/NAPMRC.2003.1177071","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177071","url":null,"abstract":"Data storage technology has evolved in two predominant directions in recent years, reflecting the two critical demands of large capacity and fast access. These two directions, embodied by hard disk drives (HDD) for the first direction, and random access memory (RAM) for the second one, have demonstrated phenomenal improvements in performance. The question arises as to whether one can envision an alternative technology that will combine the capacity of an HDD and access time of a RAM, within dimensions on the order of only several mm/sup 2/. A novel approach that is discussed involves the implementation of several concepts that have recently been advanced in the emerging field of nanotechnology. In particular, scanning probe microscopy using a large number of cantilevers operating in parallel offers a unique opportunity that is currently being pursued by several research groups at universities and companies around the world.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"196 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":"133277903","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.2003.1177020
R. Gustafson
Perpendicular recording is viewed as the next phase in the evolution of magnetic recording areal density. As we've investigated perpendicular recording technology, a number of new issues have been uncovered. Areas of difference with traditional longitudinal recording include read signals, noise, adjacent track effects. This paper reviews some of these differences, explores the factors influencing BAR for perpendicular recording technology.
{"title":"Perpendicular recording; integration issues","authors":"R. Gustafson","doi":"10.1109/NAPMRC.2003.1177020","DOIUrl":"https://doi.org/10.1109/NAPMRC.2003.1177020","url":null,"abstract":"Perpendicular recording is viewed as the next phase in the evolution of magnetic recording areal density. As we've investigated perpendicular recording technology, a number of new issues have been uncovered. Areas of difference with traditional longitudinal recording include read signals, noise, adjacent track effects. This paper reviews some of these differences, explores the factors influencing BAR for perpendicular recording technology.","PeriodicalId":111090,"journal":{"name":"Joint NAPMRC 2003. Digest of Technical Papers","volume":"27 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":"115920097","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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