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.
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Graphene
- Graphene is an allotrope of carbon consisting of a single layer of atoms arranged in a hexagonal lattice.
- 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.
- Graphene is also known as a wonder material due to its vast potential in the energy and medical world.
Applications of Graphene
- Electronics: It has the potential to create the next-generation of electronics like Faster transistors, bendable phones etc.
- Biomedical: ??Graphene’s unique properties allow for ground-breaking biomedical applications. Targeted drug delivery, improved brain penetration etc.
- Battery: Graphene could dramatically increase the lifespan of a traditional lithium-ion battery i.e., devices can be charged quicker – and hold more power for longer.
- Sensors: Ultra-sensitive sensors made from graphene could detect minute dangerous particles, helping to protect potentially dangerous environments.
- Graphene Membranes: Graphene oxide membranes are capable of forming a perfect barrier when dealing with liquids and gasses. They have even been proven to stop helium, the hardest gas to block.
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Source: TH
