MAGNETIC READ-OUT HEAD USING INDUCED RF PERMEABILITY VARIATION.

J. Akiyama, H. Iwasaki, S. Yatabe, S. Chiba

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A highly sensitive magnetic readout principle is proposed that can produce excellent output from a high-density recorded signal. This principle utilizes a sharp RF permeability change in a soft magnetic film due to a weak external field. This change is caused by both ferromagnetic resonance and magnetization rotation. A single-pole magnetic readout head has been experimentally made, using Ni-Fe film, which operates according to the above principle. The manufactured head has been evaluated by sinusoidal signals (0. 5-10 MHz), which were recorded in a longitudinally-oriented magnetic tape with a ferrite ring head (head gap: 0. 3 mu m, track width: 100 mu m). The output level reproduced (0. 5-10 MHz) from the head was considerably higher than that from the ring head. For example, for a 0. 5 MHz signal the head was 35. 7-47. 5 dB more sensitive than the ring head, and at 5 MHz the sensitivity was 17. 6-22. 5 dB better. The carrier-to-noise ratio (CNR) for a 5-MHz carrier (1 mu m wavelength) was 44-47 dB ( DELTA f:30 kHz) and was insensitive to the thickness of the magnetic-pole film (Ni-Fe).

Original languageEnglish
JournalIEEE Transactions on Magnetics
VolumeMAG-22
Issue number5
Publication statusPublished - 1986 Sep
Externally publishedYes

Fingerprint

magnetic poles
Poles
permeability
Magnetic films
Ferromagnetic resonance
Magnetic tape
readout
rings
carrier to noise ratios
Ferrite
magnetic tapes
Magnetization
output
magnetic films
ferromagnetic resonance
Wavelength
ferrites
magnetization
sensitivity
wavelengths

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Akiyama, J., Iwasaki, H., Yatabe, S., & Chiba, S. (1986). MAGNETIC READ-OUT HEAD USING INDUCED RF PERMEABILITY VARIATION. IEEE Transactions on Magnetics, MAG-22(5).

MAGNETIC READ-OUT HEAD USING INDUCED RF PERMEABILITY VARIATION. / Akiyama, J.; Iwasaki, H.; Yatabe, S.; Chiba, S.

In: IEEE Transactions on Magnetics, Vol. MAG-22, No. 5, 09.1986.

Research output: Contribution to journalArticle

Akiyama, J, Iwasaki, H, Yatabe, S & Chiba, S 1986, 'MAGNETIC READ-OUT HEAD USING INDUCED RF PERMEABILITY VARIATION.', IEEE Transactions on Magnetics, vol. MAG-22, no. 5.
Akiyama J, Iwasaki H, Yatabe S, Chiba S. MAGNETIC READ-OUT HEAD USING INDUCED RF PERMEABILITY VARIATION. IEEE Transactions on Magnetics. 1986 Sep;MAG-22(5).
Akiyama, J. ; Iwasaki, H. ; Yatabe, S. ; Chiba, S. / MAGNETIC READ-OUT HEAD USING INDUCED RF PERMEABILITY VARIATION. In: IEEE Transactions on Magnetics. 1986 ; Vol. MAG-22, No. 5.
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