Read/write head and method for magnetic reading and magneto-opti

Details Read/write head and method for magnetic reading and magneto-opti Read/write head and method for magnetic reading and magneto-opti

1998-01-12

1999-11-16

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360113, G11B 1100, G11B 5127

Patent

active

059869780

ABSTRACT:
A read/write head is structurally significantly less complicated than optical reading devices, requires minimal or no optical alignment, capable of writing at higher track densities, and has better control of the data and servo tracks than conventional magnetic heads. The head is also capable of using an available heat source and a relatively weak magnetic field, such as 300 Oersteds, to write data on a data storage medium. The combination of a magnetic read sensor with a near field magneto-optical (MO) write element creates a hybrid read/write head capable of high density recording with a high signal to noise ratio. The integration of the MO write element can be accomplished by various alternative or complementary methods. One method is to mount a heat source, such as a laser or light source on a slider with minimal or no additional optical components. Another method is to form an optical channel (or waveguide) in the slider and/or in the magnetic write element for directing a laser beam onto a target spot on, or within the data storage medium. Since magneto-optical recording requires a magnetic field of a few hundred Oersteds, the head utilizes write poles of magnetic materials operated at a low magnetic field. This is a significant simplification over existing magnetic and MO read/write heads, since the track width of the data storage medium is defined by the laser beam width and not by the pole width. In a preferred embodiment, a giant magneto-resistive (GMR) element is selected as a read element.

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