Dynamic magnetic information storage or retrieval – Head – Flux scanning
Patent
1989-12-08
1992-07-14
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Flux scanning
360123, 360125, 360119, G11B 533, G11B 517, G11B 5127, G11B 523
Patent
active
051308762
ABSTRACT:
A magnetic transducer arrangement includes a core with a gap and a body of magnetically anisotropic material in which a signal transfer region is defined. Control flux flows across the gap of the core and through the body in opposite directions. The two oppositely directed flux flows influence one another and tend to cancel each other to define a null zone. This null zone, in which the flow of control flux is very low, is sensitive to flux emanating from an adjacent magnetic storage medium and therefore defines the signal transfer region. By varying the relative proportions of control flux flowing in the opposite directions, the location of the null zone can be varied along the width of the magnetic transducer to thereby scan the signal transfer region. The flux which is coupled from the magnetic storage medium into the null zone of the body does not flow through the magnetic core in a manner similar to a fringing flux. Rather, this flux is used to modulate a reference flux, and this modulation is detected to reproduce the recorded information. In a recording mode, information flux reduces the permeability of the signal transfer region, causing the flux to fringe from the body and be coupled into the storage medium.
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Ampex Corporation
LaBarre James A.
Mossino Ralph L.
Renner Craig A.
Wolff John H.
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