MAGNETIC SENSOR
In a magnetic sensor using sensitive circuits sensing magnetic fields by the magnetic impedance effect, a sensitivity-to-noise ratio is improved. A magnetic sensor 10 includes: a sensitive circuit 12 A including sensitive parts sensing magnetic fields by magnetic impedance effect; and a sensitive circuit 12 B including sensitive parts sensing magnetic fields by magnetic impedance effect, wherein at least a part of current paths of the sensitive circuit 12 A and at least a part of current paths of the sensitive circuit 12 B overlap in a plan view, and one end portion of the sensitive circuit 12 A and one end portion of the sensitive circuit 12 B are electrically connected.
1 . A magnetic sensor comprising:
a first sensitive circuit including a sensitive part sensing a magnetic field by magnetic impedance effect; and
a second sensitive circuit including a sensitive part sensing a magnetic field by magnetic impedance effect, wherein
at least a part of a current path of the first sensitive circuit and at least a part of a current path of the second sensitive circuit overlap in a plan view, and one end portion of the first sensitive circuit and one end portion of the second sensitive circuit are electrically connected.
2 . The magnetic sensor according to claim 1 , wherein currents in portions, which overlap and face each other, of the respective first and second sensitive circuits have opposite flowing directions.
3 . The magnetic sensor according to claim 1 , wherein each of the first sensitive circuit and the second sensitive circuit has a winding structure.
4 . The magnetic sensor according to claim 3 , wherein the first sensitive circuit and the second sensitive circuit have a same planar shape in a plan view in a state where the first and second sensitive circuits face each other.
5 . The magnetic sensor according to claim 1 , wherein the first sensitive circuit is provided on a non-magnetic first substrate and the second sensitive circuit is provided on a non-magnetic second substrate.
6 . The magnetic sensor according to claim 1 , wherein the first sensitive circuit is provided on a front side of a non-magnetic substrate and the second sensitive circuit is provided on a back side of the substrate.
7 . The magnetic sensor according to claim 1 , wherein the first sensitive circuit and the second sensitive circuit are connected in series.
8 . A magnetic sensor comprising:
a sensitive circuit including a sensitive part sensing a magnetic field by magnetic impedance effect; and
a current circuit configured with a non-magnetic conductive material, wherein
at least a part of a current path of the sensitive circuit and at least a part of a current path of the current circuit overlap in a plan view, and one end portion of the sensitive circuit and one end portion of the current circuit are electrically connected.
9 . The magnetic sensor according to claim 8 , wherein the sensitive circuit is provided on a non-magnetic first substrate and the current circuit is provided on a non-magnetic second substrate.
10 . The magnetic sensor according to claim 8 , wherein the sensitive circuit is provided on a front side of a non-magnetic substrate and the current circuit is provided on a back side of the substrate.
11 . The magnetic sensor according to claim 1 , further comprising:
a focusing member configured with a soft magnetic material and focusing magnetic force lines from outside onto the sensitive circuit.
12 . The magnetic sensor according to claim 11 , further comprising:
a diverging member configured with a soft magnetic material and diverging the magnetic force lines passed through the sensitive circuit to the outside.
13 . The magnetic sensor according to claim 12 , wherein the focusing member and the diverging member are provided outside of a substrate on which the sensitive circuit is provided.