Hey guys, I am sure that you all use pen drives, memory cards for various data transfer and data storage purposes. Did you ever try to find out the science behind these devices? All these devices work on the principle of GMR effect.Let me tell you about the size of such devices before discovery of GMR effect. First of all GMR is the abbreviation for Giant Magneto Resistance effect. So before the discovery of this effect, people used to carry a 5 MB hard drive in a truck as it weighed almost 100 kg, you can see in the photo given below.
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