Pub Date : 1999-05-18DOI: 10.1109/INTMAG.1999.837242
S. Yamamoto, T. Santoki, H. Kurisu, M. Matsuura, J. Koujima, K. Nakata, Y. Kakihara, T. Do, K. Tamari
{"title":"Preparation method of Co-/spl gamma/ Fe/sub 2/O/sub 3//NiO thin film media using ECR plasma oxidization","authors":"S. Yamamoto, T. Santoki, H. Kurisu, M. Matsuura, J. Koujima, K. Nakata, Y. Kakihara, T. Do, K. Tamari","doi":"10.1109/INTMAG.1999.837242","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837242","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"225 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":"123172774","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.1999.837552
M. Yamaguchi, K. Suezawa, Y. Takahashi, K. Arai, S. Kikuchi, Y. Shimada, S. Tanabe, K. Ito
{"title":"1 GHz-drive magnetic thin-film inductors for RF integrated circuits using micro-patterned granular film","authors":"M. Yamaguchi, K. Suezawa, Y. Takahashi, K. Arai, S. Kikuchi, Y. Shimada, S. Tanabe, K. Ito","doi":"10.1109/INTMAG.1999.837552","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837552","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"105 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":"128905237","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.1999.837754
J. Scott, S. McVitie, R. Ferrier
Magnetic Force Microscopy has emerged as one of the principal imaging techniques for viewing the micromagnetic structure of materials. Image contrast depends on a number of factors with the magnetic coating of the tip being one of the most important. Different coatings are used depending on, for example, the component of sample stray field which is to be observed or the magnetic hardness of the material under investigation. In this paper we present results from tip coatings which are extremely soft in character and whose imaging properties depend on the magnetic history of the tip. The stray fields from the tips were characterised by Lorenmicroscopy and the t i p themselves were used to image an MFh4 reference sample obtained from NIST. The tips studied were standard single crystal silicon nanoprobe tips sputter coated with a layer of amorphous ferromagnetic material of thickness 30 or 50nm. The coating composition is close to FeslSi,SB13~C~ (METGLAS"2605SC). The coercivity of comparable films grown on a Si coupon is -120Alm. Imaging of the stray fields from the tips was carried out using the differential phase contrast technique [l] which provides information on the magnetic induction distribution integrated along the electron path in the STEM. In the case of the MFM tips, linescans were taken at a distance of -50nm from the end of the tip. Imaging the tip in different orientations provides data for a tomographic reconstruction algorithm which extracts the three components of field in a plane equivalent to the specimen surface in an MFM [2]. The tips were studied in the as-deposited state and after being magnetised along the tip axis. Examples of the axial reconstructed field component for these two states are given in Figs. ](a) and 2(a). It is evident that the tip with the coating in the as-deposited state possesses a more localised field than the tip which has been magnetised. Quantitative measurements of the field can be made using this method and linetraces of the fields, as shown in Figs. I(b) and 2(b), confirm the much narrower field distribution in the case of the as-deposited film. In both cases the field appears consistent with a tip possessing axial magnetisation. This arises from the tip geometry which imposes strong shape anisotropy for the film on the tip, and the absence of any megnetocrystalline anisotropy in the coating. The tips have also been used to obtain images from a reference sample [3]. Images from the asdeposited and axially magnetised tips are given in Fig. 3. Magnetic contrast from the asdeposited tip appears to arise from anractive forces only. suggesting that the tip is switched hy a P
{"title":"Characterisation of amorphous MFM tip coatings","authors":"J. Scott, S. McVitie, R. Ferrier","doi":"10.1109/INTMAG.1999.837754","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837754","url":null,"abstract":"Magnetic Force Microscopy has emerged as one of the principal imaging techniques for viewing the micromagnetic structure of materials. Image contrast depends on a number of factors with the magnetic coating of the tip being one of the most important. Different coatings are used depending on, for example, the component of sample stray field which is to be observed or the magnetic hardness of the material under investigation. In this paper we present results from tip coatings which are extremely soft in character and whose imaging properties depend on the magnetic history of the tip. The stray fields from the tips were characterised by Lorenmicroscopy and the t i p themselves were used to image an MFh4 reference sample obtained from NIST. The tips studied were standard single crystal silicon nanoprobe tips sputter coated with a layer of amorphous ferromagnetic material of thickness 30 or 50nm. The coating composition is close to FeslSi,SB13~C~ (METGLAS\"2605SC). The coercivity of comparable films grown on a Si coupon is -120Alm. Imaging of the stray fields from the tips was carried out using the differential phase contrast technique [l] which provides information on the magnetic induction distribution integrated along the electron path in the STEM. In the case of the MFM tips, linescans were taken at a distance of -50nm from the end of the tip. Imaging the tip in different orientations provides data for a tomographic reconstruction algorithm which extracts the three components of field in a plane equivalent to the specimen surface in an MFM [2]. The tips were studied in the as-deposited state and after being magnetised along the tip axis. Examples of the axial reconstructed field component for these two states are given in Figs. ](a) and 2(a). It is evident that the tip with the coating in the as-deposited state possesses a more localised field than the tip which has been magnetised. Quantitative measurements of the field can be made using this method and linetraces of the fields, as shown in Figs. I(b) and 2(b), confirm the much narrower field distribution in the case of the as-deposited film. In both cases the field appears consistent with a tip possessing axial magnetisation. This arises from the tip geometry which imposes strong shape anisotropy for the film on the tip, and the absence of any megnetocrystalline anisotropy in the coating. The tips have also been used to obtain images from a reference sample [3]. Images from the asdeposited and axially magnetised tips are given in Fig. 3. Magnetic contrast from the asdeposited tip appears to arise from anractive forces only. suggesting that the tip is switched hy a P","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"21 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":"133715866","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.1999.837663
Chang-wook Kim, W. Nah, I. Park
{"title":"Design optimization of superconducting magnet for maximum energy storage with critical surface constraints","authors":"Chang-wook Kim, W. Nah, I. Park","doi":"10.1109/INTMAG.1999.837663","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837663","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"24 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":"115427305","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.1999.837160
Y. Yamada, T. Suzuki, G. Lauhoff, H. Kanazawa
{"title":"The orgin of the large perpendicular magnetic anisotropies observed for Co/sub 3/Pt alloy thin films","authors":"Y. Yamada, T. Suzuki, G. Lauhoff, H. Kanazawa","doi":"10.1109/INTMAG.1999.837160","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837160","url":null,"abstract":"","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"318 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":"115869472","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.1999.837740
Chengtao Yang, Q. Fan, Hongyou Chen
I. lntmductim Rcmrding cards ape widely ufed for data storagc Laser cards and magnetic cards are "cry mnvement, but the data rewnteable and lugh4enuly storagc can not be mmpatble The magnetowUcal card has the advantage of high-deauty of laser m r d n g and rewnteahle of magnet~c recorLng It uses the thennoma&c principle to wte data and the magnetwpthcal &ea to read dam. Because of the nosontact reading/writing and the high-denoty of laser reoording the rcwnteatie laser card has poteNia$ huge apPl iE i I iOd ' '
{"title":"A new type of magneto-optical card","authors":"Chengtao Yang, Q. Fan, Hongyou Chen","doi":"10.1109/INTMAG.1999.837740","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837740","url":null,"abstract":"I. lntmductim Rcmrding cards ape widely ufed for data storagc Laser cards and magnetic cards are \"cry mnvement, but the data rewnteable and lugh4enuly storagc can not be mmpatble The magnetowUcal card has the advantage of high-deauty of laser m r d n g and rewnteahle of magnet~c recorLng It uses the thennoma&c principle to wte data and the magnetwpthcal &ea to read dam. Because of the nosontact reading/writing and the high-denoty of laser reoording the rcwnteatie laser card has poteNia$ huge apPl iE i I iOd ' '","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"218 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":"124303025","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.1999.837274
Qing Zhao, F. Talke, S. Meeks
{"title":"Experimental study of the effect of disk acceleration and velocity on the tribology of the head/media interface","authors":"Qing Zhao, F. Talke, S. Meeks","doi":"10.1109/INTMAG.1999.837274","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837274","url":null,"abstract":"","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":"116172645","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.2000.872037
Kuo-Chi Chiu, T. Ying, Derray Huang
The brushless spindle motor is widely used for the DVD application. The performances of reading and writing for DVD drive are highly dependent on the dynamic characteristics of this motor. In this paper, a spindle motor with 12-pole, 9-slots, radial winding and driven by the 3-phase circuit is investigated. The dynamic characteristics of spindle motor could be improved by reshaping the magnetic structure. The ratio defined as the expansion angle of opening between two adjacent slots to the expansion angle for each slot are changed with different value to study the improvement effect for the spindle motor. According the experimental results, the ratio with 1/2.5 is the optimal design for this paper.
{"title":"Performance improvfment of spindle motor for DVD drive","authors":"Kuo-Chi Chiu, T. Ying, Derray Huang","doi":"10.1109/INTMAG.2000.872037","DOIUrl":"https://doi.org/10.1109/INTMAG.2000.872037","url":null,"abstract":"The brushless spindle motor is widely used for the DVD application. The performances of reading and writing for DVD drive are highly dependent on the dynamic characteristics of this motor. In this paper, a spindle motor with 12-pole, 9-slots, radial winding and driven by the 3-phase circuit is investigated. The dynamic characteristics of spindle motor could be improved by reshaping the magnetic structure. The ratio defined as the expansion angle of opening between two adjacent slots to the expansion angle for each slot are changed with different value to study the improvement effect for the spindle motor. According the experimental results, the ratio with 1/2.5 is the optimal design for this paper.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"44 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":"121958615","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.1999.837137
Zhaohui Li, J. Zhu
The transfer curve of MR head is not linear to recorded information. Although the head and medium are designed to diminish this effect, it is unavoidable to meet the nonlinearity in head playback response. For example, improper bias current can often introduce signal asymmetry. which is from nonlinearity of the head. As PRML channels are becoming the most papular channels in magnetic recording. impact of nonlinear head to these channels need to be understood. Performance of PRML channel with nonlinear MR head is studied in this paper. The employed head transfer c w e can be obtained from the magnetic model or from experimental measurement. The nonlinear signal fmm MR head is amplified and equalized before they enter into PRML detector. If the pseudo-random sequence is used to simulate, the eye pattern of equalized signal shows the nonlinearity makes the eye open less when any other noise is not introduced. Figure 1 shows a typical eye pattern of the equalized signals for a PR4 channel with nonlinear SAUMR head. The sampled signal is not 2.0 or -2 any more, it splits into layers. Each layer comes from different combination of transition pulses. Moreover, the channel becomes very sensitive to the recording density. As the recording densities (PWSOm) grows to 2.4 or above, channel performance will be much worse than low densities because of more intersymbol interferenm. In this paper. a parameter called "deviation" is defined as the variance of the sampled equalized signal around 2, 0 or -2. When the bead operates in linear range, the deviation is always zem if no other noise is considered. If the additive noise is introduced and the head works in linear range, the deviation is the additive noise variance. The deviation is related to channel bit ermr rate. When the deviation decreases, the bit error rate will decrease. Moreover, when the deviation is small enough, the bit e m r rate would be zero. Thus, it is very useful to evaluate the channels before detector.
磁流变磁头的传递曲线与记录的信息不是线性的。虽然磁头和介质的设计是为了减少这种影响，但不可避免地要满足磁头播放响应的非线性。例如，不适当的偏置电流往往会导致信号不对称。这是由头部的非线性引起的。由于PRML通道正在成为磁记录中最受欢迎的通道。需要了解非线性水头对这些通道的影响。研究了带有非线性磁流变头的PRML信道的性能。所采用的磁头转移值可以通过磁模型或实验测量得到。在非线性信号进入PRML检测器之前，对非线性信号进行放大和均衡处理。如果用伪随机序列进行模拟，在不引入任何其他噪声的情况下，均衡信号的眼图显示非线性使眼张开较小。图1显示了带有非线性SAUMR头的PR4通道均衡信号的典型眼动图。采样信号不再是2.0或-2，它被分成几层。每一层都来自不同的过渡脉冲组合。此外，通道对记录密度变得非常敏感。当记录密度(PWSOm)增加到2.4或更高时，由于更多的码间干扰，信道性能将比低密度差得多。在本文中。一个被称为“偏差”的参数被定义为采样均衡信号在2,0或-2附近的方差。当磁头工作在线性范围内时，在不考虑其他噪声的情况下，其误差始终为零。如果引入加性噪声，且机头工作在线性范围内，则其偏差为加性噪声方差。该偏差与信道误码率有关。当偏差减小时，误码率也会减小。而且，当偏差足够小时，比特的e - m - r率为零。因此，在检测器之前对信道进行评估是非常有用的。
{"title":"Channel performance with nonlinear Mr head","authors":"Zhaohui Li, J. Zhu","doi":"10.1109/INTMAG.1999.837137","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837137","url":null,"abstract":"The transfer curve of MR head is not linear to recorded information. Although the head and medium are designed to diminish this effect, it is unavoidable to meet the nonlinearity in head playback response. For example, improper bias current can often introduce signal asymmetry. which is from nonlinearity of the head. As PRML channels are becoming the most papular channels in magnetic recording. impact of nonlinear head to these channels need to be understood. Performance of PRML channel with nonlinear MR head is studied in this paper. The employed head transfer c w e can be obtained from the magnetic model or from experimental measurement. The nonlinear signal fmm MR head is amplified and equalized before they enter into PRML detector. If the pseudo-random sequence is used to simulate, the eye pattern of equalized signal shows the nonlinearity makes the eye open less when any other noise is not introduced. Figure 1 shows a typical eye pattern of the equalized signals for a PR4 channel with nonlinear SAUMR head. The sampled signal is not 2.0 or -2 any more, it splits into layers. Each layer comes from different combination of transition pulses. Moreover, the channel becomes very sensitive to the recording density. As the recording densities (PWSOm) grows to 2.4 or above, channel performance will be much worse than low densities because of more intersymbol interferenm. In this paper. a parameter called \"deviation\" is defined as the variance of the sampled equalized signal around 2, 0 or -2. When the bead operates in linear range, the deviation is always zem if no other noise is considered. If the additive noise is introduced and the head works in linear range, the deviation is the additive noise variance. The deviation is related to channel bit ermr rate. When the deviation decreases, the bit error rate will decrease. Moreover, when the deviation is small enough, the bit e m r rate would be zero. Thus, it is very useful to evaluate the channels before detector.","PeriodicalId":425017,"journal":{"name":"IEEE International Magnetics Conference","volume":"92 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":"124632770","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.1999.837775
Y. Yoo, Seong-cho Yu, C. Kim, W. Lim
Fe and Co-based thm films with amorphous stmcture [I] or nanoaystallme phase [2], whlch exhibit good soft magnehc properties up to 10 MHz, were developed. However, with a further demand for the miniaturization of elecfmmagmtic devices, active research is now under way to develop thin films exhibiting good soft magnetic properties up to 100 MHZ or GHz For applicabon granular films consisting of metallic magnetic grains surrounded by an intergranular phase with high elecmcal resistivity in order to reduce the eddy current loss are of great interest[3]. In this shldy we are reporting the effect of Ar pressure on the soft magnebc properties of Fe-SilNn thm films prepared by co-sputtcring technique
{"title":"Effect of Ar pressure on the magnetic properties of Fe-Si/sub 3/N/sub 4/ thin film prepared by Co-sputtering","authors":"Y. Yoo, Seong-cho Yu, C. Kim, W. Lim","doi":"10.1109/INTMAG.1999.837775","DOIUrl":"https://doi.org/10.1109/INTMAG.1999.837775","url":null,"abstract":"Fe and Co-based thm films with amorphous stmcture [I] or nanoaystallme phase [2], whlch exhibit good soft magnehc properties up to 10 MHz, were developed. However, with a further demand for the miniaturization of elecfmmagmtic devices, active research is now under way to develop thin films exhibiting good soft magnetic properties up to 100 MHZ or GHz For applicabon granular films consisting of metallic magnetic grains surrounded by an intergranular phase with high elecmcal resistivity in order to reduce the eddy current loss are of great interest[3]. In this shldy we are reporting the effect of Ar pressure on the soft magnebc properties of Fe-SilNn thm films prepared by co-sputtcring technique","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":"129397631","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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