Seagate Technology Incorporated

Zhihao Li

Beat G Keel

Ganesan Doraisami

Monitoring the decay of the magnetic domains and refreshing the magnetic domains when the amount of decay has passed an established threshold allows a means to compensate for the superparamagnetic effect and increase the amount of data stored on a recording media. A high frequency reference signal and a low frequency reference signal can be written onto the magnetic media. The low frequency reference signal corresponds to large magnetic bits on the storage media surface, whereas the high frequency reference signal corresponds to small magnetic bits. Because of the large difference in decay rates between the high frequency and low frequency reference signals, any change in the difference of the two signals over time actually reflects the level of signal degradation that has occurred in the high frequency reference signal. When the difference between the high frequency and low frequency reference signal degradations exceeds a threshold level, the data is refreshed and new high and low frequency reference signals can be written on the magnetic media.

Ultrahigh density longitudinal recording on magnetic media

A lapping guide system, method and article of manufacture is disclosed. A method of fabricating a lapping guide for use in conjunction with the machining of a magnetic recording transducer includes the following steps. A plurality of lap switch fingers of the lapping guide and a bottom pole of the transducer are fabricated at the same time and from the same material. Each lap switch finger has the same topology as the topology of the bottom pole. An insulating layer is fabricated on the plurality of lap switch fingers of the lapping guide and on the bottom pole of the transducer. A top conductor is fabricated on the insulating layer above a plurality of lap switch fingers, while a top pole is fabricated on the insulating layer above the bottom pole. The top conductor and top pole are fabricated at the same time and from the same material.

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Westminster, CO, United States of America

Zhihao Li