Patent ID: 6630882
Filing Date: 2003-10-07
Classification: G01R

Abstract:
A composite magnetic sensor comprising:a galvanomagnetic device formed of a plurality of layers; wherein each layer is a respectively selected semiconductor material having a respective mobility peak at a respective temperature, wherein the respective temperatures of the mobility peaks are selected so as to be mutually spaced apart over a predetermined range of temperature; wherein said layers cumulatively provide magnetic sensitivity which is substantially insensitive to changes in temperature over said predetermined range of temperature; and wherein each layer has a thickness of at least ten nanometers; wherein said galvanomagnetic device comprises a single magnetoresistive die comprising a first layer and at least one additional layer; wherein each layer is comprised of at least one of indium antimonide and an alloy of indium antimonide, said alloy being selected from the group consisting of a selected mole fraction of indium replaced by gallium represented by In1âˆ’xGaxSb where 01âˆ’yPy where 01âˆ’zAsz where 0wherein said layers comprise a first layer, a second layer and a third layer, said first second and third layers having a total thickness, wherein the first layer comprises substantially 16% of the total thickness and is doped n type to substantially 1.2Ã—1017 cmâˆ’3, the second layer comprises substantially 20% of the total thickness and is doped p type to substantially 0.3Ã—1017 cmâˆ’3, and the third layer comprises substantially 64% of the total thickness and is doped p type to substantially 0.5Ã—1017 cmâˆ’3.