Co-Ni-Fe write heads with a 10-μm yoke length for high-speed recording

Nonaka, Y.; Honjo, H.; Toba, T.; Saito, Susumu; Ishi, Tsutomu; Saito, Mikiko; Ishiwata, N.; Ohashi, Keisuke

doi:10.1109/20.908490

Cited by 13 publications

(3 citation statements)

References 13 publications

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“…This film has bcc-fcc mixed crystalline structure, and therefore, it is suggested that crystal grains with different crystalline structure from each other act as the inhibitor. Moreover, new heads using these high-B s CoNiFe films show superior write performance compared with heads using conventional magnetic thin films [28,30,55,56]. Therefore, some researchers have reported soft magnetic CoNiFe film with high resistivity.…”

Section: Conife Alloy Filmsmentioning

confidence: 95%

Magnetic Heads

Yokoshima

2009

Nanostructure Science and Technology

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Figure 6.1 shows how rapidly the areal density of hard disk drives (HDD) has been increasing over the past 20 years [1]. Several critical innovations were necessary to bring about such rapid progress in the field of magnetic recording [2]. One of the most significant innovations from the viewpoint of material improvement was the electrodeposition of permalloy (Ni 80 Fe 20 ), which was introduced by IBM in 1979 as the core material of a thin-film inductive head to increase the magnetic recording density [3]. After the introduction of the magneto-resistive (MR) element as the read head and the electrodeposited permalloy as the write head by IBM in 1991 [4], the rate of increase in the recording density of HDDs jumped from 30% per year to 60% per year. Recently, a giant magneto-resistive (GMR) element has been used for the read element instead of the MR element. The rate of increase in the recording density jumped to over 100% per year in 1999, which is an incredible rate of increase. Since 2002, however, the rate of increase has decreased to 30%; thus, new innovations are required to maintain the rate of increase. In 2004, the practical use of perpendicular magnetic recording instead of longitudinal magnetic recording was announced [5]. This system is a critical innovation for developing high-performance HDD systems with high-recording density. The design of the magnetic recording head was changed because of the change of the recording system.The development of a new magnetic recording head with higher performance and smaller dimensions is a key requirement for realizing high-density magnetic recording. Furthermore, to meet the demand for the rapid increase in magnetic recording density, the soft magnetic film in the core must have low magnetostriction, l s , high electrical resistivity, r, high thermal stability, low film stress, and high corrosion resistance, as well as high saturation magnetic flux density, B s . The recording heads, using higher magnetic materials with high value of B s can write to a high-H c

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Section: Conife Alloy Filmsmentioning

confidence: 95%

Magnetic Heads

Yokoshima

2009

Nanostructure Science and Technology

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“…Figure 1 is a schematic drawing of a shielded loop coil, which is the detection part of the magnetic field probe. The coil of our new probe was fabricated on a glass substrate by using a thin-film process called fine pattern-plating 8) . In the lithographic process, reduction projection printing using an i-line stepper was used instead of the contact printing used to fabricate our previous coil on a glass substrate.…”

Section: Structure Of a Shielded Loop Coilmentioning

confidence: 99%

Development of Miniaturized Thin-Film Magnetic Field Probes for On-Chip Measurement

et al. 2006

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We developed thin-film magnetic field probes with a high spatial resolution aiming to obtain the absolute value of a high-frequency power current on an LSI chip. The spatial resolution was enhanced by miniaturizing the shielded loop coil, which is the detection part of the probe. The minimum outer size of the new coil is 50 x 22 µm. In taking measurements with the new probe over a 60-µm-wide microstrip line used as a device under test (DUT), we found that the probe output decreases by 6 dB at a distance of 40 µm. This value is less than half that of our previous probe, which was around 100 µm. In taking measurements with the new probe over 5-µm-wide microstrip lines used as a DUT, we found that the new probe achieved 10-µm-class high spatial resolution. This value is comparable to the typical width of global power lines on an LSI chip, which ranges from 10 µm to 100 µm. We estimated the configuration of the lines on an LSI chip that would enable the new probe to achieve a spatial resolution high enough to obtain the absolute value of a high-frequency power current on an LSI chip.

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“…This B s value is higher than that of any other CoNiFe‐based soft magnetic thin film which had been developed in 1997. In addition, the CoNiFe plating bath was further improved, and the CoNiFe film plated from the improved bath was used for fabricating commercial quality recording heads,16–20 as shown in Figure 2, where CoNiFe film as thick as 1.5 µm was uniformly deposited without the formation of voids or cracks even upon bending. The corrosion characteristics of CoNiFe are also represented and summarized in Reference 17.…”

Section: Creation Of Magnetic Thin Films For Magnetic Recording Drivesmentioning

confidence: 99%

Creation of highly functional thin films using electrochemical nanotechnology

Osaka

2004

The Chemical Record

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This overview describes the results of our recent study of the application of electrochemical nanotechnology to the fabrication of magnetic recording materials, interconnects in ultra-large-scale integrated (ULSI) devices, energy storage materials, and on-chip biosensors. It is important to note that electrochemical processes play significant roles in developing and fabrication such sophisticated materials and devices. In the field of magnetic recording, electrodeposition methods for preparing CoNiFe and CoFe soft magnetic thin films with a high saturation magnetic flux density were newly developed, and the significant issues for obtaining those films are highlighted. In the area of ULSI interconnects, we developed a technique using a self-assembled monolayer (SAM) for direct bonding of the interconnect layer to SiO2, and proposed a novel electroless deposition method for fabricating a diffusion barrier layer. In the field of batteries, electrodeposited SnNi alloy was proposed as a future anode material for Li batteries, and electrochemical MEMS processes were shown to be useful for fabricating micro-sized direct methanol fuel cells (DMFCs) as portable batteries for electronics applications. In the area of chemical sensors, we developed a new process for fabricating field effect transistors (FETs) modified with SAMs for on-chip biosensing applications.

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Co-Ni-Fe write heads with a 10-μm yoke length for high-speed recording

Cited by 13 publications

References 13 publications

Magnetic Heads

Magnetic Heads

Development of Miniaturized Thin-Film Magnetic Field Probes for On-Chip Measurement

Creation of highly functional thin films using electrochemical nanotechnology

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