Spin-transfer torque

Okay kiddo, you know how when you spin a top, it keeps rotating until it slows down and stops? That's because of something called "torque", which is basically a force that makes things rotate.

Now, imagine that instead of a top, we have something called an "electron". Electrons are teeny tiny little things that are too small to see, but they're really important because they make up everything around us including you and me!

Sometimes, when electrons are moving through a special type of material called a magnetic material, they can interact with the magnetic field and start to spin in a certain direction. This is called "spin". And just like how a top needs torque to keep spinning, these spinning electrons also need torque to keep going.

That's where "spin-transfer torque" comes in. It's a special type of torque that happens when a current of electricity is sent through the magnetic material. The current of electricity can basically push the spinning electrons in a certain direction, which keeps them going and makes them even stronger.

Scientists are really interested in spin-transfer torque because it could have a lot of applications in things like making faster and more efficient computer memory. So while it might be a little complicated to understand, it's actually a really cool and important concept in science!