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ITE Technical Report
26.64

[title in Japanese]

Released: June 23, 2017

p.Cover1-

Full Text PDF[12K]

[title in Japanese]

Released: June 23, 2017

p.Toc1-

Full Text PDF[40K]

Magnetic Field Measurement of a Write Head With the Electron Beam Tomography

Kimio NAKAMURA, Tomokazu SHIMAKURA, Kenichi ITOH, Hiroshi SUZUKI

Released: June 23, 2017

MMS2002-58

We have developed a technique to measure magnetic field of a write head. This technique is based on modified transmission electron microscopy (TEM). A patterned electron beam is projected to a head surface and distorted by magnetic field. Magnetic field distribution is obtained as a tomography image of a distorted pattern image.

Evaluation of High Frequency Properties of RW-Wires Used for HDD Heads

Masahiro YAMAGUCHI, Chikao TESHIROGI, Kazuya YOSHIDA, Takashi KURIBARA, Shin YABUKAMI, Shinki KIKUCHI, Ken-Ichi ARAI

Released: June 23, 2017

MMS2002-59

Beginning from the study of reproducibility of electric contact between the wafer probe and the RW wire, equivalent circuit parameters of RW-wires were extracted as ; Low frequency inductance of a pair of W- or R- wire was 30nH, which means each wire has inductance of 15nH or less. Low frequency resistance was 5Ω, showing the resistance of each wire as 2.5Ω. Stray capacitance were 2-3 pF at low frequencies. Resonance frequency was 2GHz. Cross-talk model is also discussed.

Recording Field Analysis of a High Track Density SPT Head (2) : for various areal densities

Ryo MATSUBARA, Hideaki WATANABE, Yasushi KANAI, Hiroaki MURAOKA, Yoshihisa NAKAMURA

Released: June 23, 2017

MMS2002-60

High track density perpendicular SPT head is investigated by using 3-D finite element analysis. By assuming the side shield cores, the stray field can be decreased greatly when the density of 200Gb/in^2 (100nm write track width) is assumed. It is noted that the value of (stray field at adjacent track) / (recording field on track) can be reduced greatly with the side yoke shields as noted in 1Tb/in^2 analysis. To compensate the decrease of write field, increasing the main pole thickness is the most effective.

Calculations of Read-out Characteristics for Front-yoke Stacked-type TMR Head

Kenji MACHIDA, Noato HAYASHI, Yasuyoshi MIYAMOTO, Takahiko TAMAKI, Yoshihiro FUJITA, Junji NUMAZAWA

Released: June 23, 2017

MMS2002-61

A front-yoke stacked-type TMR (Tunneling MagnetoResistive) head has an advantage of lower noise with a large size of the TMR element. The head has a symmetrical structure to the element, and produces Lorentzian waveforms without any distortion in combination with perpendicular magnetic recording media. Therefore, a conventional signal processor is applicable to the head. However, there is a crucial issue of crosstalk from adjacent tracks. This paper describes the design and performance of the front-yoke stacked-type TMR head. Three-dimensional magnetic field calculations of some read-out characteristics were carried out, and it was found that an effective method to increase signal output and decrease crosstalk from adjacent tracks.

High performance specular spin-valve films with an FeCo-based ultrathin oxide layer by ion-assisted oxidation

Hideaki FUKUZAWA, Hitoshi IWASAKI, Masashi SAHASHI

Released: June 23, 2017

MMS2002-62

We compared specular spin-valve films with an Fe_<50>Co_<50> nano-oxide layer (NOL) and a Co_<90>Fe_<10> NOL in a pinned layer, prepared by natural oxidation and ion-assisted oxidation (IAO). With small oxygen exposures during the oxidation for the Fe_<50>Co_<50> NOL by IAO, good ferromagnetic coupling through the NOL and high specularity at the NOL interface were concurrently obtained. On the other hand, natural oxidation did not cause large MR enhancement for either the Co_<90>Fe_<10> or Fe_<50>Co_<50> NOLs, and the Co_<90>Fe_<10> NOL by IAO caused weak magnetic coupling through the NOL, resulting in a small MR ratio. The Fe_<50>Co_<50> NOL for small oxygen exposures is a good candidate for a final specular spin-valve film head for 100-Giga-bit per square inch recording.

MR enhancement of CPP-GMR in Spin-valve : Role of the ferromagnetic layers in metal-based spin-valve

Hiromi YUASA, Hideaki FUKUZAWA, Hitoshi IWASAKI, Masayuki TAKAGISHI, Masashi SAHASHI

Released: June 23, 2017

MMS2002-63

In this report we present a method improving GMR characteristics by replacing the ferromagnetic materials of the metal-based spin-valves in current-perpendicular-to- plane (CPP) geometry. AΔR (the product of the element area, A, and the change in resistance, ΔR) was investigated for three kinds of ferromagnetic materials : Co_<90>Fe_<10> (material A), Fe_<50>Co_<50> (material B), and Fe_<50>Co_<50> with 0.13 nm Cu layers (material C). AΔR is 1.0 mΩμm^2, 1.6 mΩμm^2, and 2.9 mΩμm^2 for materials A, B, and C, respectively. Simple analysis using the Valet-Fert model leads to two results. The first is that both the spin-dependent interface and bulk resistance are enhanced when material A is replaced by material B. The second is that the spin-dependent bulk resistance is increased when material B is replaced by material C. These results suggest the possibility of increasing AΔR without increasing the element resistance AR of spin valves in CPP geometry.

[title in Japanese]

Released: June 23, 2017

p.App1-

Full Text PDF[73K]

[title in Japanese]

Released: June 23, 2017

p.App2-

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Volume And Issue List
ITE Technical Report

ITE Technical Report
26.64

[title in Japanese]

[title in Japanese]

Magnetic Field Measurement of a Write Head With the Electron Beam Tomography

Evaluation of High Frequency Properties of RW-Wires Used for HDD Heads

Recording Field Analysis of a High Track Density SPT Head (2) : for various areal densities

Calculations of Read-out Characteristics for Front-yoke Stacked-type TMR Head

High performance specular spin-valve films with an FeCo-based ultrathin oxide layer by ion-assisted oxidation

MR enhancement of CPP-GMR in Spin-valve : Role of the ferromagnetic layers in metal-based spin-valve

[title in Japanese]

[title in Japanese]

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ITE Technical Report26.64

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