2015 IEEE Magnetics Conference (INTERMAG)最新文献_第8页

A non-skiving tape head with sub-ambient air pressure cavities 一种带亚环境气压腔的不刮带头

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7157659

J. Engelen, V. Jonnalagadda, S. Furrer, H. Rothuizen, M. Lantz

{"title":"A non-skiving tape head with sub-ambient air pressure cavities","authors":"J. Engelen, V. Jonnalagadda, S. Furrer, H. Rothuizen, M. Lantz","doi":"10.1109/INTMAG.2015.7157659","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157659","url":null,"abstract":"A small head-medium spacing is crucial for achieving high linear densities in magnetic tape recording. Traditional contoured (cylindrical) tape heads have been superseded by flat-profile tape heads with sharp skiving edges to remove the natural air bearing that forms between tape and a contoured head, to reduce the head-tape spacing [1]. This means that tape is in contact with the head surface and that the spacing is determined predominantly by the tape surface roughness. To further reduce the head-medium spacing, the tape surface roughness needs to be reduced, which however results in increased head-medium friction. High friction is problematic for tape durability, for reliable operation of the data channel, and for accurate track-follow control. Although friction is lower for smaller tape wrap angles, reducing the wrap angle in a skiving configuration is not desirable because it results in an unacceptable increase in head-medium spacing. Furthermore, recent research has shown that a substantial amount of the friction originates at the skiving edges of the head. In this work, we present a new tape head design which allows dispensing with the skiving edges to reduce friction, while simultaneously maintaining tape-head contact above the read/write transducers.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130669659","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}

引用次数: 1

Dynamic effects in the characterization of the magnetocaloric effect of LaFeSi-type alloys 动态效应在lafesi型合金磁热效应表征中的应用

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7157648

C. Romero-Torralva, C. Mayer, V. Franco, A. Conde

{"title":"Dynamic effects in the characterization of the magnetocaloric effect of LaFeSi-type alloys","authors":"C. Romero-Torralva, C. Mayer, V. Franco, A. Conde","doi":"10.1109/INTMAG.2015.7157648","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157648","url":null,"abstract":"In this work, the influence of the rate of change of the applied field to three magnetocaloric samples is studied: a bulk Gd sample used as a reference material, and fully hydrogenated La0.7Ce0.3Fe11.7Si1.3H1.8 and La0.7Ce0.3(Fe0.882Mn0.018Si0.1)13H1.8 alloys, denoted as ERASTEEL-NX and ERASTEEL-11688, respectively . Bulk samples ERASTEEL-NX and ERASTEEL-1688 were prepared from powder batches obtained by gas atomization process as described in [4] . The powder was then sintered at 1150°C for 5 hours in Ar (it has to be noticed that this is not the optimal temperature for maximizing the proportion of NaZn13 type phase), and the obtained blocs were treated at 400°C for 1 hour in hydrogen . The final proportions of NaZn13 type phase is respectively 80 .5% (instead of 92% for optimized heat treatment) and 85% (instead of 92% also for optimized heat treatment) in ERASTEEL-NX and ERASTEEL-1688 . ERASTEEL-NX, with 30% of Ce substituted to La and no substitution on the Fe site shows a very strong 1st order transition, with a wide hysteresis . ERASTEEL-1688 contains some Mn atoms in substitution to Fe . This induces a softening of the 1st order character of the magnetic transition in this sample . The adiabatic temperature change of the samples has been measured using a commercial setup consisting of a set of Halbach cylinders as a variable field source up to 1.78 T, and a thermocouple placed between two pieces of sample, with dimensions of 8 x 4 x 0 .75 mm, which registers the temperature difference between the sample and the sampleholder . The sample is kept in vacuum inside a bath cryostat . The temperature of the sampleholder is stabilized before performing each of the adiabatic measurements . The rate of change of the field ranged from 0 .25 T s-1 to 3 T s-1, which is equivalent to frequencies of a magnetic refrigerator operating between 0 and 1 .78 T ranging from 0 .07 Hz to 0 .84 Hz .","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123814198","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}

引用次数: 1

Reliability analysis of a nine-phase flux-switching PM machine 九相磁通开关永磁电机可靠性分析

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7156636

W. Li, W. Hua, M. Cheng, F. Yu, S. Ding

引用次数: 0

Rotor mechanical stress and deformation analysis of coreless stator axial-flux permanentmagnet machines 无芯定子轴向磁通永磁电机转子机械应力与变形分析

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7156691

Y. Cao, L. Yu, H. Jia

{"title":"Rotor mechanical stress and deformation analysis of coreless stator axial-flux permanentmagnet machines","authors":"Y. Cao, L. Yu, H. Jia","doi":"10.1109/INTMAG.2015.7156691","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7156691","url":null,"abstract":"Axial-flux permanent-magnet (AFPM) machine with its compact structure, flat shape and high torque-to-weight ratio is increasingly being popularized and applied in various applications, such as wheel motor drives and portable generator sets. The coreless stator design of AFPM machines reduces the weight and eliminates core losses, which can operate at higher efficiency than conventional machines. The coreless AFPM machine has two outer rotor discs and one inner coreless stator disc. The rotor discs play a role both in magnetic circuit and mechanical support. For the coreless AFPM machine, the axial and circumferential electromagnetic force in the rotors will be generated by air-gap magnetic field. The circumferential electromagnetic force leads to electromagnetic torque, which is necessary for the motor rotation. The axial electromagnetic force may cause the rotor's deflection and affect the machine's reliability. Several analysis methods of the axial electromagnetic force and structure deformation for the AFPM machine have been reported. In [1], a simplified two-dimensional (2-D) finite element method (FEM) and three-dimensional (3-D) FEM are used to analyze and design the rotor discs of a high-speed AFPM generators. In [2], the combination method of numerical calculation and FEM is used to study the stiffness of the rotors of an AFPM machine. But there still remain some problems. 3-D FEM is time consuming and 2-D FEM is not accurate enough.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123344015","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}

引用次数: 8

Spin dice (physical random number generator using spin torque switching) and its thermal response 自旋骰子(使用自旋转矩开关的物理随机数发生器)及其热响应

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7157258

A. Fukushima, K. Yakushiji, H. Kubota, S. Yuasa

引用次数: 6

Wide dynamic range SQUID magnetometer with noise cancellation for magnetocardiogram without magnetically shielded room 宽动态范围SQUID消噪磁力计，适用于无磁屏蔽室的心脏磁图

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7157578

K. Kobayashi, T. Murakami, D. Oyama

引用次数: 1

Inverse magnetoresistance in single layer Fe3O4 film 单层Fe3O4薄膜的逆磁阻

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7157433

E. Liu, W. Zhang, X. Hu, R. Du, H. Ou, C. Kou, Y. Wang, Y. Zhai, J. Du, Y. Xu, H. Zhai

{"title":"Inverse magnetoresistance in single layer Fe3O4 film","authors":"E. Liu, W. Zhang, X. Hu, R. Du, H. Ou, C. Kou, Y. Wang, Y. Zhai, J. Du, Y. Xu, H. Zhai","doi":"10.1109/INTMAG.2015.7157433","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157433","url":null,"abstract":"Half-metallic magnetite with high spin polarization at the Fermi level has always been an ideal candidate for spin dependent transport study, and understanding of the magnetic transportation property of Fe3O4 becomes a critical issue for its future applications in spintronics. Generally the resistance of Fe3O4 decreases (negative MR) when applied in a magnetic field as the conduction in Fe3O4 is attributed to a small polaron hopping mechanism between Fe2+ ions and Fe3+ ions in oxygen ions octahedral sites, and the applied field is suggested to broaden the polaronic band leading to enhanced conduction. Previous studies on magnetic transportation of Fe3O4 film also confirm its negative MR effect, and positive MR effect is only observed in a few specific structures such as TiN/ Fe3O4 superlattices, magnetic tunnel junctions with Fe3O4 electrode, the increase of resistance after application of magnetic field for these system is ascribed to the spin selective quantum confinement effects in the heterostructure, which refer to the extrinsic structures instead of the intrinsic magnetic transportation property of magnetite film. However, in our recent studies, an anomalous positive magnetotransport behavior is demonstrated on high oriented Fe3O4 film grown on Si substrate at high temperature, and the inverse MR effect is believed to be highly correlated to the strong orientation of Fe3O4 film.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121198548","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}

引用次数: 1

Research on combined pole for interior permanent-magnet machine 内嵌式永磁电机组合磁极的研究

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7157423

P. Zheng, Zhouhan Lin, Y. Sui

引用次数: 1

Permanent magnet assisted current superimposition variable flux machine 永磁辅助电流叠加可变磁通机

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7156547

A. Kohara, K. Hirata, N. Niguchi, Y. Ohno

引用次数: 10

Skyrmions at room temperature in magnetic multilayers 室温下磁多层中的Skyrmions

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-05-11 DOI: 10.1109/INTMAG.2015.7156672

C. Moreau-Luchaire, N. Reyren, C. Moutafis, J. Sampaio, N. Van Horne, C. Vaz, P. Warnicke, K. Garcı́a, M. Weigand, K. Bouzehouane, C. Deranlot, J. George, J. Raabe, V. Cros, A. Fert

引用次数: 3