Composite magnetic sensor
First Claim
Patent Images
1. 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 In1−
xGaxSb where 0<
x<
1, and of a selected mole fraction of antimony replaced by at least one of phosphorous represented by InSb1−
yPy where 0<
y<
1, and arsenic represented by InSb1−
zAsz where 0<
z<
1, each layer having a respectively predetermined doping level and respectively predetermined energy gap which thereby provide the respective mobility thereof;
wherein 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 1.2×
1017 cm−
3, the second layer comprises substantially 20% of the total thickness and is doped p type to substantially 0.3×
1017 cm−
3, and the third layer comprises substantially 64% of the total thickness and is doped p type to substantially 0.5×
1017 cm−
3.
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Accused Products
Abstract
Composite galvanomagnetic devices having a desired combination of properties in specific temperature ranges and magnetic field ranges and so combined that desired properties are provided over an extended temperature and magnetic field range. In practice this can be accomplished with a single die with layers of different properties. Particularly, the present invention addresses this method as related to magnetoresitors and Hall plates.
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Citations
11 Claims
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1. 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 In1−
xGaxSb where 0<
x<
1, and of a selected mole fraction of antimony replaced by at least one of phosphorous represented by InSb1−
yPy where 0<
y<
1, and arsenic represented by InSb1−
zAsz where 0<
z<
1, each layer having a respectively predetermined doping level and respectively predetermined energy gap which thereby provide the respective mobility thereof;
wherein 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 1.2×
1017 cm−
3, the second layer comprises substantially 20% of the total thickness and is doped p type to substantially 0.3×
1017 cm−
3, and the third layer comprises substantially 64% of the total thickness and is doped p type to substantially 0.5×
1017 cm−
3.- View Dependent Claims (2)
a substrate of GaAs upon which is formed said plurality of layers; and
a plurality of metallic shorting bars in contact with at least one layer of said magnetoresistive die.
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3. 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 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 In1−
xGaxSb where 0<
x<
1, and of a selected mole fraction of antimony replaced by at least one of phosphorous represented by InSb1−
vPy where 0<
y<
1, and arsenic represented by InSb1−
xwhere 0<
z<
1, each layer having a respectively predetermined doping level and respectively predetermined energy gap which thereby provide the respective mobility peak thereof;
wherein 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 comprises substantially 16% of the total thickness and is doped n type with at least one element selected from the group consisting of Te, Se, S and Si to substantially 1.2×
1017 cm−
3, wherein the second layer comprises substantially 20% of the total thickness and is doped p type with at least one element selected from the group consisting of Be, C, Mn, Mg, Sr, Cd and Zn to substantially 0.3×
1017 cm−
3, and the third layer comprises substantially 64% of the total thickness and is doped p type with at least one element one element selected from the group consisting of Be, C, Mn, Ca, Sr, Cd and Zn to substantially 0.5×
1017 cm−
3.- View Dependent Claims (4)
a substrate of GaAs upon which is formed said three layers; and
a plurality of metallic shorting bars in contact with at least one layer of said magnetoresistive die.
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5. 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 is a Hall plate comprising a plurality of layers having a total thickness, and total thickness being substantially between 0.5 microns and 2 microns, and having an aspect ratio of substantially between 10;
1 and 1;
1;
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 In1−
xGaxSb where 0<
x<
1, and of a selected mole fraction of antimony replaced by at least one of phosphorous represented by InSb1−
yPy where 0<
y<
1, and arsenic represented by InSb1−
zAsz where 0<
z<
1, having a respectively predetermined doping level and respectively predetermined energy gap which thereby provide the respective mobility peak thereof;
wherein said plurality of layers comprises 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 7% of the total thickness and is doped n type to substantially 1.2×
1017 cm−
3, the second layer comprises substantially 20% of the total thickness and is doped p type to substantially 3×
1016 cm−
3, and the third layer comprises substantially 73% of the total thickness and is doped p type to substantially 5×
106 cm−
3.- View Dependent Claims (6, 7)
a substrate of GaAs upon which is formed said first, second and third layers; and
a plurality of metallic contacts in contact with at least one layer of said Hall plate.
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8. A composite magnetic sensor comprising three layers, 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 In1−
- xGaxSb wherein 0<
x<
1, and of a selected mole fraction mole fraction of antimony replaced by at least one of phosphorous represented by InSb1−
yPy where 0<
y<
1, and arsenic represented by InSb1−
zAsz where 0<
z<
1, each layer having a respectively predetermined doping level and respectively predetermined energy gap which thereby provide the respective mobility peak thereof;wherein 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 1.2×
1017 cm−
3, the second layer comprises 20% of the total thickness and is doped p type to substantially 0.3×
1017 cm−
3, and the third layer comprises substantially 64% of the total thickness and is doped p type to substantially 0.5×
1017 cm−
3.- View Dependent Claims (9)
- xGaxSb wherein 0<
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10. A Hall plate comprising:
a plurality of layers having a total thickness, said total thickness being substantially between 0.5 microns and 2 microns, and having an aspect ratio of substantially between 10;
1 and 1;
1;
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 In1−
xGaxSb where 0<
x<
1, and of a selected mole fraction of antimony replaced by at least one of phosphorous represented by InSb1−
yPy where 0<
y<
1, and arsenic represented by InSb1−
zAsz where 0<
z<
1, having a respectively predetermined doping level and respectively predetermined energy gap which thereby provide the respective mobility peak thereof; and
wherein said plurality of layers comprises 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 7% of the total thickness and is doped n type to substantially 1.2×
1017 cm−
3, the second layer comprises substantially 20% of the total thickness and is doped p type to substantially 3×
1016 cm−
3, and the third layer comprises substantially 73% of the total thickness and is doped p type to substantially 5×
1016 cm−
3.- View Dependent Claims (11)
Specification