| 摘要 |
<p>An MR dual element head (70) of the present invention solves a shorting problem between sensing and mutually biasing MR elements of a dual element head without suffering the penalty of signal reduction due to shunting of sense current. In a preferred embodiment, two MR elements (72, 74) are neither totally insulated from each other, nor shorted along their entire lengths by a contiguous conductive spacer, but are separated by an insulating layer (76) which has shorting stubs (78, 80) at its ends for electrically shorting the MR elements. A current (82) applied to the shorted MR elements splits into two currents (88, 90) that flow in the same direction through the substantially identical MR elements to provide the bias, and to serve as sense currents for detecting element resistance change. The MR elements are biased to operate in a magnetically unsaturated mode. This results in a 'bootstrapping' of short wavelength signals that effectively amplifies the reproduced signal over a broad region of the signal spectrum when the linear spacing between the MR elements is in the range of from one half to one times the linear distance between the flux changes recorded on the signal medium. In a second embodiment, MR elements (12, 14) are in contact with a conductive spacer (16) for their entire lengths.</p> |
