Magnetic Read-out Head Using Induced RF Permeability Variation in Ni-Fe Thin Film

Akiyama, Jun-etsu; Iwasaki, Hiroaki; Yatabe, S.; Chiba, Satoshi

doi:10.1109/tjmj.1987.4549566

Cited by 1 publication

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“…Nevertheless, it is almost impossible to read-out such high density signals using an inductive head, because it has inadequate output and SNR. From this point of view, the author has already developed a highly sensitive magnetic readout head called the Active Head [3], [4], [5], [6]. The reproduction principle is to read-out signals by detecting the voltage change in an rf resonant circuit coupled to a soft magnetic film due to the sharp rf permeability change in the film.…”

Section: Introductionmentioning

confidence: 99%

An Active Head Using the Magnetoresistive Effect in the High Frequency Region

Akiyama

1991

J. Magn. Soc. Jpn.

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A highly sensitive magnetic read-out head HFMRH High Frequency Magnetoresistive Head ) is introduced, which is based on a new magnetoresistlve (HR) effect.-The author has experimentally discovered that a conventional HR head shows the new HR effect at a frequency (fr) so high as to cause ferromagnetic resonance (FMR). Head performance was evaluated with a new parameter, modified HR ratio (ARmax/JR ARmax maximum resistance change, R:resistance) which is proportional to the signal-to-noise ratio (SNR). The experimental results showed that the modified HR ratio at fr can be much larger than that at a frequency lower than fr. It has been confirmed that the new effect can be applied to a magnetic read-out head with a higher output level and a higher SNR than the normal HR effect observed with direct current (dc). The new head design is promising for realizing future ultra high-density magnetic recording systems.

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Section: Introductionmentioning

confidence: 99%

An Active Head Using the Magnetoresistive Effect in the High Frequency Region

Akiyama

1991

J. Magn. Soc. Jpn.

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Magnetic Read-out Head Using Induced RF Permeability Variation in Ni-Fe Thin Film

Cited by 1 publication

References 0 publications

An Active Head Using the Magnetoresistive Effect in the High Frequency Region

An Active Head Using the Magnetoresistive Effect in the High Frequency Region

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