How does a GMR sensor work?
The effect is based on the dependence of electron scattering on spin orientation. The main application of GMR is in magnetic field sensors, which are used to read data in hard disk drives, biosensors, microelectromechanical systems (MEMS) and other devices.
What is GMR current sensor?
GMR sensors directly detect magnetic field rather than the rate of change in magnetic field; therefore, they are useful as DC field sensors. NVE’s GMR sensors are sensitive to small changes in magnetic fields. This allows for accurate measurement of position or displacement in linear or rotational systems.
What is GMR spin valve?
A spin valve is in general a sample consisting of a GMR trilayer – two magnetic layers separated by a non-magnetic spacer. One of the two magnetic layers is very magnetically soft – meaning it is very sensitive to small fields.
How do pneumatic sensors work?
Pneumatic and hydraulic pressure sensors are transducers, generating an electrical signal in proportion to the pressure they measure. This allows pressure to be monitored by a range of electronic devices.
What is GMR in magnetic field?
The Giant Magnetoresistance (GMR) is the large change in the electrical resistance which is induced by the application of a magnetic field to thin films composed of alternating ferromagnetic and nonmagnetic layers.
What does a current sensor do?
A current sensor is a device that detects and converts current to an easily measurable output voltage, which is proportional to the current through the measured path. There are a wide variety of sensors, and each sensor is suitable for a specific current range and environmental condition.
What are GMR materials?
Abstract: Giant magnetoresistance (GMR) is a quantum mechanical magnetoresistance. effect observed in thin film structures composed of alternating ferromagnetic and nonmagnetic layers. The effect manifests itself as a significant decrease (typically 10– 80%) in electrical resistance in the presence of a magnetic field.
What is a GMR cell?
GMR technology GMR cells consist of three layers of material – two layers of cobalt (magnetizable) and one layer of copper (non-magnetizable). Without a magnetic field applied, the atoms of these layers do not allow electrons to pass through because of the high resistance between the layers.
Are sensors AC or DC?
Current sensors, also commonly referred to as current transformers or CTs, are devices that measure the current running through a wire by using the magnetic field to detect the current and generate a proportional output. They are used with both AC and DC current.
How do AC current sensors work?
AC current changes potential, which causes the magnetic field to continually collapse and expand. In an AC current sensor, wire is wrapped around a core. The magnetic field produced by the current flowing through your conductor induces a proportional current or voltage in the wire that is within the current sensor.
What is DC sensor?
DC sensors allow the measurement of DC currents via a direct connection, conductor through-hole, or clamp-on/split-core.
How does a current sensor works?
How do current sensors work? When current flows through a conductor, it creates a proportional magnetic field around the conductor. Current transformers use this magnetic field to measure current flow. If the CT is designed to measure AC current, inductive technology is often used.