A wearable audio device with an electro-acoustic transducer for creating audio output, the electro-acoustic transducer comprising a transducer magnet that produces a transducer magnetic field, a magnetic field sensor spaced from the electro-acoustic transducer and constructed and arranged to sense the Earth's magnetic field, and a magnetic shield comprising a material with high magnetic permeability. The shield is configured to intercept at least some of the transducer magnetic field before it reaches the magnetic field sensor.

A method of using an electronic toolset for locating, reading, adjusting and confirming adjustment of an implantable bodily fluid drainage system without requiring recalibration following adjustment from a current valve setting to a new valve setting using an electronic toolset including an adjustment tool having a magnetic element and an indicator tool including a sensor array. The need to remove the electronic toolset from the patient to recalibrate or zero the sensor array prior to confirming the new valve setting is eliminated. This is realized by disposing a ferromagnetic system component of the indicator tool in a magnet shield cage made of a metallic alloy to prevent magnetic fields produced by a magnetic element in the adjustment tool during the adjusting step from influencing the sensor array.

A magnetoresistor device includes a magnetoresistor, a protection layer, a first conductive structure, and a second conductive structure. The magnetoresistor is disposed over a substrate. The protection layer is formed over a portion of the magnetoresistor. The first conductive structure is disposed over the protection layer and includes a lower barrier layer and a metal layer disposed over the lower barrier layer. The second conductive structure is disposed over the substrate and partially covers the magnetoresistor. The second conductive structure includes the lower barrier layer and the metal layer disposed over the lower barrier layer.

A magnetic detector includes a full-bridge circuit including magnetoresistive sensors on the same substrate. The magnetoresistive sensors include two magnetoresistive films and have different relationships between the fixed magnetization direction and the bias application direction. The fixed magnetization direction and the bias application direction are determined with three or more exchange coupling films including antiferromagnetic layers with different blocking temperatures. Thus, the magnetic detector has high resistance to a strong magnetic field, is easy to produce, and has a high degree of flexibility in production.

Disclosed is a magnetometer architecture that uses a separate shield to minimize cross-axis sensitivity with low impact on main axis sensitivity. In an embodiment, a magnetometer with cross-axis shielding comprises: a ring shield; a magnetic yoke disposed within the ring shield; and one or more magnetic field sensors disposed between the ring shield and the magnetic yoke, the magnetic field sensors positioned relative to the ring shield and the magnetic yoke such that flux induced by a magnetic field is absorbed in a cross-axis direction of the magnetometer.

Techniques for mitigating magnetic sensor errors are contemplated. In some aspects, the disclosed technology provides a method for reducing measurement errors in a directional module of a drilling system that includes steps for: receiving a current measurement from a current sensor, wherein the current measurement is associated with electrical current received at the current sensor via a first conductive branch and a second conductive branch, receiving a field measurement from a magnetic sensor, and associating the current measurement from the current sensor with the field measurement from the magnetic sensor. Systems and machine-readable media are also provided.

A magnetic substance detection sensor includes a support substrate, a semiconductor chip provided on the support substrate and having a magnetic field detection element, a permanent magnet provided on the support substrate, and a resin encapsulation layer covering the semiconductor chip and the permanent magnet. The resin encapsulation layer has a first resin layer exposing the permanent magnet and covering the semiconductor chip, and a second resin layer continuously covering the permanent magnet and the first resin layer, and stress caused by curing contraction of the second resin layer is smaller than that of the first resin layer.

A wearable audio device with a magnetic field sensor that is constructed and arranged to sense the Earth's magnetic field. A magnet in the earphone, for example the magnet of the electro-acoustic transducer, produces a first magnetic field having a first magnetic field strength. A docking or parking magnet in the earphone produces a second magnetic field that is configured to reduce an influence of the first magnetic field on the magnetic field sensor.

A wearable audio device with a magnetic field sensor that is constructed and arranged to sense the Earth's magnetic field. A magnet in the earphone, for example the magnet of the electro-acoustic transducer, produces a first magnetic field having a first magnetic field strength. A nulling magnet produces a nulling magnetic field along at least a first nulling magnet axis. The nulling magnet is configured to reduce an influence of the first magnetic field on the magnetic field sensor. The first nulling magnet axis, the first magnet axis, and the first sense axis are aligned.

A first magnetic member is provided in a region farther inward than an outer peripheral edge of a first magnetoresistance element. A second magnetoresistance element is provided in a region farther inward than an inner peripheral edge of the first magnetoresistance element and is covered by the first magnetic member or is provided in a region farther outward than the outer peripheral edge of the first magnetoresistance element and is covered by a second magnetic member. A first conductor includes a first base section and a first narrow section. The area of the exterior surface of the first narrow section as viewed from a direction perpendicular to an insulating layer is smaller than that of the first base section. In the first conductor, the first base section and the first narrow section are arranged side by side in the direction perpendicular to the insulating layer.