Magnetoresistance:
The researchers in the UK, have found that graphene displays an anomalous giant magnetoresistance (GMR) at room temperature.
- Magnetoresistance is a phenomenon where the electrical resistance of a conductor is affected by magnetic fields in adjacent materials.
- When the materials are magnetised in the same direction, the electrical resistance in the conductor is low.
- When the directions are opposite each other, the resistance increases.
- The magnetoresistance observed in the graphene-based device was found to be “almost 100 times higher than that observed in other known semimetals in this magnetic field range.”
- It is used in hard disk drives and magnetoresistive RAM in computers, biosensors, automotive sensors, microelectromechanical systems, and medical imagers.
- GMR-based devices are particularly used to sense magnetic fields.
