Digest of the Magnetic Recording Conference 'Magnetic Recording Heads'最新文献

Nanoindentation And The Tribology Of Head-disk Interface Components 纳米压痕与头盘界面元件的摩擦学

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658254

R. White, E. Schreck, Run-Han Wang

{"title":"Nanoindentation And The Tribology Of Head-disk Interface Components","authors":"R. White, E. Schreck, Run-Han Wang","doi":"10.1109/MRC.1995.658254","DOIUrl":"https://doi.org/10.1109/MRC.1995.658254","url":null,"abstract":"Nanoindentation data are presented for three different but interrelated components of the thin film disk magnetic recording system-the air bearing slider/recording head, the disk substrate, and the sputter deposited thin film disk recording medium. Hardness traces across the slider trailing edge demonstrate the hardness of the NiFe, sputtered Al/sub 2/O/sub 3/, and the ceramic Al/sub 2/O/sub 3//TiC are 8, 10 and 24-40 GPa, respectively. Lapping under non-optimum, aggressive conditions can lead to significant recession in these components which is directly related to their hardness. The hardness and modulus have been measured for a number of alternate substrate materials ranging from AlMg/NiP to glass and glass ceramic. The ability of these substrates to resist damage from slider shock forces is presented and generally increases with substrate hardness, although other criteria (fracture toughness and plasticity initiation) rue required to rationalize all the data. Finally, hardness and modulus of carbon overcoat films are presented which have been sputtered under various conditions. The process variations lead to variations in hardness, the hardness/modulus (H/E) parameter, and tribological performance in slider/disk testing. The applicability of these mechanical property parameters to the wear degradation is discussed.","PeriodicalId":129841,"journal":{"name":"Digest of the Magnetic Recording Conference 'Magnetic Recording Heads'","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122057892","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: 12

GMR Multilayers And Head Design For Ultra High Density Recording 超高密度记录用GMR多层和磁头设计

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658259

N. Smith, A. Zeltser, M. Parker

{"title":"GMR Multilayers And Head Design For Ultra High Density Recording","authors":"N. Smith, A. Zeltser, M. Parker","doi":"10.1109/MRC.1995.658259","DOIUrl":"https://doi.org/10.1109/MRC.1995.658259","url":null,"abstract":"Recently reported work on application of giant magnetoresistance (GMR) technology toward building ultra high density (> 1 Gbithnch') magnetic reproduce heads appears to favor the spin-valve design as a replacement for the anisotropic magnetoresistive (AMR) sensor in an otherwise conventional shielded-MR configuration.' One potential problem of trying to similarly substitute in an antiferromagnetically-coupled GMR multilayer, is that unlike a single active layer spin-valve, the high sense current densities (J, > lo7 A/cm*) required for both biasing and adequate signal levels will produce large magnetic fields internal to the multilayer which can induce a graded, opposite polarity transverse bias magnetization in each half of the multilayer.2 A picturization of this effect in an 2Nmagnetic multilayer is shown in Fig. 1. However, such a bipolar bias magnetization distribution is a 2N-layer GMR analogue to the previously described AMR dual-magnetoresistive (DMR) head.3 Like a DMR with an effective layer thickness teff = N t , and reproduce gap geff = 4/3 N(t+t'), such a selfbiased \"GMR-DMR\" head can achieve extremely high linear resolution without shields. In addition to the obvious potential for much increased AR/R ratio, a GMR-DMR should be intrinsically selfstabilized by the multilayer's antiferromagnetic interlayer exchange coupling without the fabrication complexity of additional exchange pinning layers. With N >> 1, the cross-track response should be approximately symmetric. It can be shown2 that the characteristic flux propagation length A of a practical GMR-DMR will be roughly a few tenths micron, and so this head design is naturally most suited for the submicron active sensor dimensions useful for ultra high density recording.","PeriodicalId":129841,"journal":{"name":"Digest of the Magnetic Recording Conference 'Magnetic Recording Heads'","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121860128","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: 2

Spin Tunneling Magnetoresistive Effect In Ferromagnet/AI/sub 2/O/sub 3/Ferromagnet Junctions 铁磁体/AI/sub 2/O/sub 3/铁磁体结的自旋隧穿磁阻效应

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658262

T. Miyazaki, N. Tezuka

{"title":"Spin Tunneling Magnetoresistive Effect In Ferromagnet/AI/sub 2/O/sub 3/Ferromagnet Junctions","authors":"T. Miyazaki, N. Tezuka","doi":"10.1109/MRC.1995.658262","DOIUrl":"https://doi.org/10.1109/MRC.1995.658262","url":null,"abstract":"The giant magnetoresistance (GMR) found in magnetic multilayers and its fundamental problems as well as its promising application have raised considerable interest for the field of spin-polarized electron transport. Spin-polarized tunneling effect (magnetic tunneling valve effect) in ferromagnet/insulator/ferromagnet is a very similar phenomenon to that of the GMR. The pioneering work of the spin-polarized tunneling was conducted first by Julliere' for Fe/ GeKo junction. The relative change of conductance with magnetic field, AG/G, was approximately 14 % at low temperature, where AG is the difference of conductance between the parallel and antiparallel magnetizations of two ferromagnetic electrodes and G is the conductance in the state of antiparallel magnetization. After this report several challenges were carried out in order to prepare a junction with large conductance (or resistance) ratio. However, the highest value of MR ratio at room temperature was only 2.7 %2, far less than the expected value from spinpolarizations. Here the MR ratio is defined as = (Rap R,) E,, where Rp (RU,, is the resistance for like (unlike) direction of magnetization in the two electrodes. Recently, junctions with MR ratio more than 10 9% even at room temperature were prepared by our g r ~ u p ~ , ~ and by Moodera et al.5. From the phenomenological and theoretical treatments1Z6x7 the MR ratio can be expressed as","PeriodicalId":129841,"journal":{"name":"Digest of the Magnetic Recording Conference 'Magnetic Recording Heads'","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128430101","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: 0

Spin-valve Heads Utilizing Antiferromagnetic NiO Layers 利用反铁磁NiO层的自旋阀头

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658261

Yoshihiro Hamakawa, H. Hoshiya, T. Kawabe, Yoshio Suzuki, Reiko Arai, Kazuhiro Nakamoto, M. Fuyama, Yutaka Sugita

{"title":"Spin-valve Heads Utilizing Antiferromagnetic NiO Layers","authors":"Yoshihiro Hamakawa, H. Hoshiya, T. Kawabe, Yoshio Suzuki, Reiko Arai, Kazuhiro Nakamoto, M. Fuyama, Yutaka Sugita","doi":"10.1109/MRC.1995.658261","DOIUrl":"https://doi.org/10.1109/MRC.1995.658261","url":null,"abstract":"Spin-valve heads utilizing antiferromagnetic NiO layers as the pinning layers were investigated. Advantages of using NiO are (1) superior corrosion resistance, (2) relatively high blocking temperature and (3) reduction in the heat generation due to current shunting. Spin-valve films of a structure of NiO/NiFe/Cu/NiFe show large /spl Delta//spl rho///spl rho/ (approximately 4%) and good sensitivity. Thin Co layers inserted between NiFe and Cu improve both /spl Delta//spl rho///spl rho/ and the thermal stability. To explore the feasibility of spin-valves with NiO, unshielded sensors with hard bias structure having longitudinally magnetized permanent magnets were fabricated. Irregular response in the transfer curves can be suppressed when the permanent magnet strength M/sub r/t is 0.5 memu/cm/sup 2/ or more. The linear response region of the spin-valve sensor was optimized by adjusting the thickness of the pinned layers and the sensor height. Finally, by incorporating these results a shielded spin-valve head with a track width of 2.4 /spl mu/m, a gap length of 0.3 /spl mu/m and a sensor height of 0.7 /spl mu/m was fabricated The response was noise-free and the output obtained with a small sense current of 0.41 mA was approximately 1 mVp-p, demonstrating a high sensitivity of a spin-valve head utilizing NiO.","PeriodicalId":129841,"journal":{"name":"Digest of the Magnetic Recording Conference 'Magnetic Recording Heads'","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115636117","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: 36

Electrostatic Modeling And ESD Damage Of Magnetoresistive Recording Heads 磁阻记录磁头的静电建模与ESD损伤

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658245

A. Wallash

引用次数: 4

Spin-valve Structures For Recording Heads 记录磁头用旋转阀结构

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658258

V. Speriosu, B. Gurney, R. Fontana, T. Lin, M. Dovek, C. Tsang, D. Heim, M. Williams

引用次数: 0

Analytic And Quasi-Analytic Formulae For MR Heads MR头的解析和拟解析公式

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658244

S. Shtrikman, D.R. Smith

引用次数: 0

Recording Performance & Process Tolerance Of Dual-stripe MR Heads 双条带磁流变磁头的记录性能及过程容差

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658242

Yi‐min Guo, Y. Hsu, K. Ju

引用次数: 12

Overview Of Progress In Giant Magnetoresistive Sensors Based On NiFe/Ag Multilayers 基于NiFe/Ag多层材料的巨磁阻传感器研究进展综述

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658260

M. Parker, K. Coffey, J. K. Howard, R. Fontana, C. Tsang, T. L. Hylton

{"title":"Overview Of Progress In Giant Magnetoresistive Sensors Based On NiFe/Ag Multilayers","authors":"M. Parker, K. Coffey, J. K. Howard, R. Fontana, C. Tsang, T. L. Hylton","doi":"10.1109/MRC.1995.658260","DOIUrl":"https://doi.org/10.1109/MRC.1995.658260","url":null,"abstract":"The evolution of devices based on NiFe and Ag in thin film giant magnetoresistance (GMR) structures is reviewed and traced from the early continuous multilayer (CML) structures, through granular alloys (GAs) of NiFe and Ag, spin valves (SVs), discontinuous multilayers (DMLs), and the most recent patterned multilayer (PML) structures. The technological motivation far the development of these various structures, based in particular on field sensitivity as an important figure of merit, and their limitations is discussed. Although DMLs are shown to possess the highest sensitivity, 1.2%/Oe, it is shown that they are limited by noise. Various issues affecting the implementation of NiFe/Ag DML sensors are addressed with particular emphasis on noise, since presently noise gates the development of a successful sensor. The MR characteristics of DML sensors are examined as a function of different biasing schemes to reduce noise and improve linearity. It is shown that the transverse response of ten-layer DML sensors when transversely biased may give acceptable noise performance. This represents one of the two fundamental approaches to the reduction of noise in NiFe/Ag MLs, i.e. one based on the concept of increasing the number of easily switchable ferromagnetic \"grains\" in the structure. The other approach is based on the concept of a sensor consisting of single large domains in each NiFe layer which provided the impetus for the development of patterned multilayer (PML) devices. Finally, the GMR response of these PML structures is briefly discussed.","PeriodicalId":129841,"journal":{"name":"Digest of the Magnetic Recording Conference 'Magnetic Recording Heads'","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116449901","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: 22

Recording Characteristics Of A Head With Higher Saturation Flux Density On The Trailing Edge Pole 后缘极高饱和磁通密度磁头的记录特性

Digest of the Magnetic Recording Conference 'Magnetic Recording Heads' Pub Date : 1995-07-10 DOI: 10.1109/MRC.1995.658267

T. Ishida, R. Sugita, N. Kaminaka

引用次数: 4