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Source: The post is based on the article “What is magnetoresistance? It’s one more thing graphene does differently” published in The Hindu on 15th April 2023
What is the News?
Researchers in the UK have discovered that graphene displays an anomalous giant magnetoresistance (GMR) at room temperature.
What is 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 a quantum mechanical magnetoresistance effect observed in multilayers composed of alternating ferromagnetic and non-magnetic conductive layers.
The 2007 Nobel Prize in Physics was awarded to Albert Fert and Peter Grünberg for the discovery of GMR.
Applications of GMR: GMR is used in hard disk drives, magnetoresistive RAM in computers, biosensors, automotive sensors, microelectromechanical systems, and medical imagers.
What did the researchers discover?
Researchers have discovered that graphene displays an anomalous giant magnetoresistance (GMR) at room temperature.
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.”
