• Nobel laureate Andre Geim has recently discovered that Graphene displays an anomalous giant magnetoresistance (GMR) at room temperature.

About GMR                                                                                       

  • Magnetoresistance is the tendency of a material to change the value of its electrical resistance in an externally-applied magnetic field.
  • 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.
    • When materials are magnetised in same direction, electrical resistance in the conductor is low.
    • When directions are opposite each other, resistance increases.
  • Application of GMR: Hard disk drives and magnetoresistive RAM in computers, biosensors, automotive sensors, microelectromechanical systems, and medical imagers.
  • New study has found that a graphene-based device, unlike conventional counterparts, wouldn’t need to be cooled to a very low temperature to sense magnetic fields.

About Graphene

  • Graphene is ‘a two-dimensional single-atom-thick layer of carbon atoms bonded in a hexagonal honeycomb lattice structure.
  • It has exceptionally high tensile strength, electrical conductivity, transparency, and thinnest two-dimensional material in the world.
  • It is almost perfectly transparent since it only absorbs 2 percent of light.
  • It is extracted from graphite.
  • Applications include Energy (Solar cell, Fuel cell, Super computers etc); Sensor, Bio-sensor; Biomedical (diagnostic, drug delivery etc); Environment treatment etc


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