Magneto-resistive reading head with suppression of thermal noise

Details Magneto-resistive reading head with suppression of thermal noise Magneto-resistive reading head with suppression of thermal noise

1977-10-11

1978-10-24

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

338 32R, 324252, G11B 530

Patent

active

041225058

ABSTRACT:
A magnetic reading head having a magneto-resistive element of the type in which the measuring current is forced to flow through the element at an angle with the easy axis of magnetization. For suppressing thermal noise (resistance variations under the influence of temperature fluctuations as a result of the contact of the element with a moving record carrier), the element is subjected to an auxiliary field parallel to the easy axis of magnetization, the direction of which is reversed at a frequency f.sub.s. The measuring current alternates at the same frequency in phase with the reversals of the auxiliary field. The output signal of the element is applied through a low-pass filter which cuts off signals of a frequency f.sub.s to a detection device.

REFERENCES:
patent: 3848217 (1974-11-01), Lazzari
patent: 4040113 (1977-08-01), Gorter
patent: 4052748 (1977-10-01), Kuijk
IBM Technical Discl. Bulletin, vol. 20, No. 2, Jul. 1977, pp. 791-793, "Barberpole MR Head".

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