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In News
- Researchers found that graphene displays an anomalous Giant magnetoresistance (GMR) at room temperature.
What is Magnetoresistance & Giant Magnetoresistance (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.
- The 2007 Nobel Prize in Physics was awarded to Albert Fert and Peter Grünberg for the discovery of GMR.
More about Study
- The magnetoresistance observed in the graphene-based device was “almost 100 times higher than that observed in other known semimetals in this magnetic field range.”
- The team attributed this to the presence of a ‘neutral’ plasma and the electrons’ mobility.
Applications of GMR
- It is used in hard disk drives and magneto-resistive RAM in computers, biosensors, automotive sensors, micro-electromechanical systems, and medical imagers.
- GMR-based devices are particularly used to sense magnetic fields.
Graphene
Applications of Graphene
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Source: TH
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