Aspects of this disclosure relate to a resettable closed-loop multi-turn magnetic sensor. In one aspect, the sensor includes a nanowire forming a plurality of loops, a plurality of domain orientation sensors configured to detect locations of a pair of domain walls within the nanowire, and an initialization circuit configured to inject the pair of domain walls into the nanowire. The nanowire forms a closed-loop via a bridge crossing connecting two of the loops.

Aspects of this disclosure relate to a resettable closed-loop multi-turn magnetic sensor. In one aspect, the sensor includes a nanowire forming a plurality of loops, a plurality of domain orientation sensors configured to detect locations of a pair of domain walls within the nanowire, and an initialization circuit configured to inject the pair of domain walls into the nanowire. The nanowire forms a closed-loop via a bridge crossing connecting two of the loops.

A magnetic sensor device includes a conductor that constitutes a coil, and a detection circuit including a plurality of MR elements. The coil includes an upper coil portion. The upper coil portion includes a first conductor portion and a second conductor portion. An average cross-sectional area of the upper coil portion in the first conductor portion of the upper coil portion is smaller than that of the upper coil portion in the second conductor portion. The first conductor portion is located at a position where a first partial magnetic field occurring from the first conductor portion is applied to an MR element.

A magnetic sensor device includes a conductor that constitutes a coil, and a detection circuit including a plurality of MR elements. The coil includes an upper coil portion. The upper coil portion includes a first conductor portion and a second conductor portion. An average cross-sectional area of the upper coil portion in the first conductor portion of the upper coil portion is smaller than that of the upper coil portion in the second conductor portion. The first conductor portion is located at a position where a first partial magnetic field occurring from the first conductor portion is applied to an MR element.

An anti-interference circuit board and a terminal are provided. The circuit board specifically includes a substrate (10). The substrate (10) has a first surface, and a first region (14) for placing a magnetometer (2) is disposed on the first surface. A plurality of circuit layers (11, 12, 15) are disposed in the substrate (10), and the plurality of circuit layers (11, 12, 15) are disposed in a stacked manner. For example, at least a first functional circuit (20) that is configured to generate a magnetic field in a first direction and a second functional circuit (30) that is configured to generate a magnetic field in a second direction are disposed in a stacked manner and are disposed in the substrate (10). When positions of the first functional circuit (20) and the second functional circuit (30) are specifically disposed, the following is met: the first region (14) is located in vertical projections of the first functional circuit (20) and the second functional circuit (30) on the first surface. It can be learned from the foregoing descriptions that the first functional circuit (20) and the second functional circuit (30) are disposed to compensate for interference to the magnetometer (2) in the first region (14), and during disposing, the first functional circuit (20) and the second functional circuit (30) are located below the magnetometer (2), to reduce an occupied surface area of the anti-interference circuit board.

An assembly includes a permanent magnet generating a magnetic field. The permanent magnet is arranged on the rotary member and generates a magnetic field perpendicular to an axis of rotation. A first channel has a first magnetic sensing element centered on the axis of rotation, the first channel providing a first angular data. A second channel has a second magnetic sensing element centered on the axis of rotation, the second channel providing a second angular data. The second magnetic sensing element is spaced from the first magnetic sensing element. Each of the first magnetic sensing element and the second magnetic sensing element have three voltage dividers. A processor computes a magnetic stray field component orthogonal to the magnetic field by comparing a first field strength based on the first angular data with the second field strength based on the second angular data.

An assembly includes a permanent magnet generating a magnetic field. The permanent magnet is arranged on the rotary member and generates a magnetic field perpendicular to an axis of rotation. A first channel has a first magnetic sensing element centered on the axis of rotation, the first channel providing a first angular data. A second channel has a second magnetic sensing element centered on the axis of rotation, the second channel providing a second angular data. The second magnetic sensing element is spaced from the first magnetic sensing element. Each of the first magnetic sensing element and the second magnetic sensing element have three voltage dividers. A processor computes a magnetic stray field component orthogonal to the magnetic field by comparing a first field strength based on the first angular data with the second field strength based on the second angular data.

A magnetometer includes a vapor cell having at least one wall, a chamber defined by the at least one wall, and alkali metal atoms disposed in the chamber to produce an alkali metal vapor in the chamber, wherein the at least one wall includes an oxide-containing interior surface; and an anti-relaxation coating disposed on the oxide-containing interior surface of the at least one wall of the vapor cell, wherein the anti-relaxation coating is a reaction product of the oxide-containing interior surface of the at least one wall with at least one mono- or dichlorosilane compound.

A magnetic field generator includes a first planar substrate, a second planar substrate positioned opposite to the first planar substrate and separated from the first planar substrate by a gap, a first wiring set on the first planar substrate, a second wiring set on the second planar substrate, and one or more interconnects between the first planar substrate and the second planar substrate. The one or more interconnects electrically connect the first wiring set with the second wiring set to form a continuous electrical path. The continuous electrical path forms a conductive winding configured to generate, when supplied with a drive current, a first component of a compensation magnetic field configured to actively shield a magnetic field sensing region located in the gap from ambient background magnetic fields along a first axis that is substantially parallel to the first planar substrate and the second planar substrate.

A magnetic field sensor for detecting motion of an object includes one or more magnetic field sensing elements configured to generate a magnetic field signal in response to a magnetic field associated with the object and a detector configured to generate a comparison signal having edges occurring in response to a comparison of the magnetic field signal and a threshold signal and occurring at a rate corresponding to a speed of motion of the object. A speed monitor responsive to the comparison signal is configured to generate a speed signal having a value indicative of the speed of motion of the object. A threshold generator having an input coupled to receive the speed signal from the speed monitor and an output coupled to the detector is configured to generate the threshold signal at a first level when the value of the speed signal indicates that the speed of motion of the object is greater than a predetermined speed and at a second level when the value of the speed signal indicates that the speed of motion of the object is less than the predetermined speed.